Total variability between scores & mean

Which of the following is true?

trailer is making a sig contribution

When do we need change statistics?

when we use stepwise, when we use hierarchical

Where is the intercept point?

When the regression line crosses the Y axis

What is forced entry?

All variables entered simultaneously

What is step wise entry?

predictors selected using semi-partial outcome correlation

Why do we use histograms?

check residual stats, Check for outliers

What is a regression coefficient?

Something that described the gradient

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Correlation and Regression

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Questions 125

Answers

1
What type of correlation is demonstrated by the scatter plot?
Negative
Upward
Positive
No Correlation
2
Which correlation coefficient suggests the strongest correlation?
.02
-.4
.6
-.9
3
SSt =
Total variability between scores & mean
Sum squared total values as averages
Model variability difference in variability of model & mean
Residual error variability between model & mean
4
Calculate the correlation coefficient for the following data
0.9362
-0.7294
-0.9362
0.7294
5
Which of the following is NOT a way to deal with data?
measures of dispersal
make central tendencies
guess the results
6
How are these two variables correlated? Hours spent watching TV & Test Grades
Negative
Upward
Positive
No Correlation
7
What type of correlation is demonstrated by the scatter plot?
Negative
Positive
No Correlation
Downward
8
What kind of correlation does this scatterplot depict?
Positive Correlation
No Correlation
Negative Correlation
9
What type of correlation does the graph show?
Relative
Positive
No Correlation
Negative
10
What kind of relationship seems to exist between CO2 and global temperature?
Cause-Effect
No Correlation
Positive Correlation
Negative Correlation
11
In the equation y=4x-5, what number represents the y intercept?
-5
-4
5
4
12
Which of the following is true?
everything is sig
we can predict press or trailer from the equation
press is making a sig contribution
trailer is making a sig contribution
13
What kind of relationship seems to exist between coal consumption and life expectancy?
Negative Correlation
No Correlation
Cause-Effect
Positive Correlation
14
A strong correlation indicates a cause and effect relationship.
Only when positive.
Always
Sometimes
Never
15
When do we need change statistics?
when we use forced entry
when we use stepwise
when we use hierarchical
16
Slope and correlation are the same thing.
True
False
17
Where is the intercept point?
When the regression line crosses the X axis
When the regression line is absolute zero
When the regression line crosses the Y axis
18
Which of the following is NOT a variation type?
Continuous (diff between points)
Ordinal
Numerical
Dispersal (variances etc)
19
Cost of a Pair of Sneakers and Sneakers Color
Negative Correlation
Positive Correlation
No Correlation
20
What is forced entry?
All variables entered simultaneously
predictors selected using semi-partial outcome correlation
ordered from the previous literature
21
What kind of relationship seems to exist between % population 65+ and health expenditures?
Positive Correlation
No Correlation
Cause-Effect
Negative Correlation
22
Temperature outside and the number of people wearing sweaters
Negative Correlation
Positive Correlation
No Correlation
23
The data in the image below shows perfect positive correlation:
False
True
24
What is step wise entry?
All variables entered simultaneously
ordered from the previous literature
predictors selected using semi-partial outcome correlation
25
What is the best estimate for the value of r for the scatterplot shown?
0.5
0.7
0.9
1.1
26
Which model is better at predicting the number of viewers?
Neither
Model 2
Model 1
Both
27
What kind of correlation does this scatterplot depict?
Positive Correlation
Negative Correlation
No Correlation
28
We can make predictions using linear regression.
True
False
29
What kind of relationship seems to exist between college enrollment rate and tuition?
Negative Correlation
No Correlation
Cause-Effect
Positive Correlation
30
What type of correlation is demonstrated by the scatter plot?
Positive
Upward
Negative
No Correlation
31
What kind of relationship seems to exist between video game play and GPA?
No Correlation
Cause-Effect
Positive Correlation
Negative Correlation
32
This box tells us that __% of the variance is accounted for.
56%
30.2%
3.5%
35.5%
33
A scatter plot contains exactly two coordinate points. The value of r could equal
undefined
0
all of the above
1
34
What type of correlation is demonstrated by the scatter plot?
No Correlation
Downward
Negative
Positive
35
Why do we use histograms?
check residual stats
check for significance
Check for outliers
check the model fit
36
A regression line is a ___ based on data.
model
number
mean
graph
37
Which of the following indicates the following relationship
ϒ = -0.68
ϒ = 0.5
ϒ = -0.6
ϒ = 0.09
38
What kind of relationship seems to exist between average temperature and elevation?
Positive Correlation
Negative Correlation
No Correlation
Cause-Effect
39
Regressions are symmetrical.
False
True
40
Which model accounts for more variance?
model 2
model 1
41
What kind of relationship seems to exist between height and weight?
Cause-Effect
Negative Correlation
Positive Correlation
No Correlation
42
Temperature of ocean water and number of people swimming
Postive Correlation
No Correlation
Negative Correlation
43
What does the ANOVA table here, tell us?
The errors in the data
If the whole model is sig
the change in outcome
44
When we have multiple models we will likely get a _____ box in SPSS output.
Graph
coefficients
Excluded variables
ANOVA
45
Multiple regression uses more...
Data
SPSS
Experimenters
Variables
46
What is a regression coefficient?
a type of measurement
a type of descriptive stats
Something that described the gradient
47
Number of Calories Burned and Time Exercising
Positive Correlation
Negative Correlation
No Correlation
48
What type of correlation is demonstrated by the scatter plot?
Negative
No Correlation
Positive
Upward
49
Which value could represent the correlation coefficient?
r = 1.0
r = -0.74
r = 0.74
r = 0.16
50
What type of correlation is shown?
No Correlation
Positive Correlation
Negative Correlation
Cannot determine from the graph.
51
Why would predicting the number of months before machine use = 0 be unreliable?
Correlation too low
It is reliable
Interpolation
Extrapolation
52
When do we reject the null hypothesis?
when p=<0.05
when p=>0.05
when p=>0.0128
53
Which of the following is NOT a possible value for the correlation coefficient
-0.5
1.5
-0.9
0
54
Air pollution Levels and Number of Cars on the Road
Positive Correlation
No Correlation
Negative Correlation
55
SSr =
Residual error variability between model & mean
Model variability difference in variability of model & mean
Total variability between scores & mean
Sum squared total values as averages
56
In the least squares regression form of a line y = a + bx, what does b represent?
The y -intercept
The slope
coefficient of determination
correlation coefficient
57
What is homoscedasticity?
when errors are the same across IV's
when data is the same across IV's
When there is no correlation
58
Estimate r between 2 quiz scores if everyone scores +8 on second quiz.
-0.35
0.57
1
-1
59
How are these two variables correlated? Number of pets you have & Your age
No Correlation
Negative
Upward
Positive
60
Which STAT Test can be used to calculate the regression line?
Anova
TTest
LinRegTTest
rTest
61
What does this table tell you?
fit of the model
how accurate your graph was
how sig the model is
62
How do we tell how well the model fits the data?
Descriptive stats
Residual stats
ANOVA
coefficients
63
How are these two variables correlated? Shoe Size & Height
Negative
No Correlation
Upward
Positive
64
With a POSITIVE correlation, what happens to one variable if the other one increases?
It decreases
It also increases
There is no relationship
It stays the same
65
Which variable does NOT make a sig contribution to the model.?
press
trailer
neither
both
66
Hours worked and money earned
Postive Correlation
No Correlation
Negative Correlation
67
What kind of relationship seems to exist between studying and GPA?
No Correlation
Cause-Effect
Negative Correlation
Positive Correlation
68
What kind of relationship seems to exist between math score and shoe size?
No Correlation
Negative Correlation
Positive Correlation
Cause-Effect
69
As a car ages, its value decreases. Which scatterplot below best represents this?
B
D
A
C
70
What would be true about the coefficient of determination for the given graph?
r2 > 1.0
r2 = 1.0
r2 would be negative.
0 < r2 < 1.0
71
In our residuals, we want NO standard residuals greater than ____.
1.5
3
2
2.5
72
If your data is in L1 and L3, how do you tell the calculator to use L3?
[VARS]Y-VARS 3
[Alpha]3
[STAT]EDIT 3
[2nd][3]
73
What does the t-test tell us?
If the DV is making a sig contribution
If the IV is making a sig contribution
if increasing by 0.161 mill is sig
if increasing by 0.399 mill is sig
74
95% of standardized residuals should lye between -+___%
2
2.99
3
2.95
75
If the Correlation Coefficient is positive, which statement may not be true?
The regression line will have a positive slope.
The coefficient of determination will be positive.
There is a positive correlation.
There is a strong correlation.
76
With a NO correlation, what happens to one variable if the other one increases?
There is no relationship
It decreases
It also increases
It stays the same
77
How do we describe a linear relationship?
Descriptive stats
A straight line
Descriptive words
Qualitative analysis
78
RegEQ is the regression equation. How do you put it in Y1?
[VARS]Y-VARS[ENTER][ENTER]
[ALPHA]Y[ALPHA]1
[STAT]CALC
[STAT]EDIT
79
Which is NOT a type of correlation?
Negative
Positive
Upward
No Correlation
80
The scatterplot indicates which of the following
can not be determined
negative relationship
positive relationship
no relationship
81
Which of the following graphs has the strongest correlation?
A
E
D
B
82
Which correlation coefficient suggests the weakest correlation?
-.4
-.9
.6
.02
83
which best representsthe amount of money the carpenter would earn from a job that took 5days
$200
$1250
$2500
$500
84
What kind of relationship seems to exist between ice cream consumption and clothing?
No Correlation
Cause-Effect
Positive Correlation
Negative Correlation
85
What kind of correlation does this scatterplot depict?
Negative Correlation
No Correlation
Positive Correlation
86
What type of correlation is demonstrated by the scatter plot?
Positive
No Correlation
Upward
Negative
87
As X increases, Y decreases. This describes ____________ correlation.
No
Negative
Weak
Positive
88
You determine that you would win 25 debates if you practice 7 hours. You used...
Extrapolation
Another plot
Math
Interpolation
89
What zoom setting allows you to see a scatter plot?
LinReg (E)
Scatter (13)
Standard (6)
ZoomStat (9)
90
The total sum of squares tell us...
Total variability
Total error
Total mean
91
SSm =
Model variability difference in variability of model & mean
Residual error variability between model & mean
Total variability between scores & mean
Sum squared total values as averages
92
Match the correlation values below to the descriptions (in order 1, 2, 3, 4, 5)
E, D, C, B, A
D, B, C, E, A
B, C, E, D, A
A, C, D, B, E
93
What does the press Beta value tell us?
as press increases, number of viewers increases 0.161 mill
as press increases, number of viewers increases 0.129 mill
as press increases, number of viewers increases 0.281 mill
94
Which of the following graphs has the weakest negative correlation?
A
D
B
E
95
Bank account number and amount of money in account
No Correlation
Negative Correlation
Positive Correlation
96
For the scatter plot below, the correlation coefficient r = 0.
False
True
97
What kind of relationship seems to exist between # books owned and hours spent reading?
No Correlation
Negative Correlation
Cause-Effect
Positive Correlation
98
What type of correlation is shown in the table below?
Weak Positive
Strong Positive
Weak Negative
Zero
99
What type of correlation is demonstrated by the scatter plot?
Upward
Positive
No Correlation
Negative
100
Which color has the weakest correlation?
Green
Orange
Blue
Purple
101
Number of miles driven and price of used car
Negative Correlation
No Correlation
Positive Correlation
102
Put the graphs in order of correlation from strongest negative to strongest positive.
A, B, C, D, E, F
A, B, C, E, D, F
F, E, C, B, A, D
A, B, D, C, E, F
103
Describe the relationship represented by the equation y= -3x+7
No relationship
Positive
Non linear
Negative
104
Which scatterplots show the strongest relationship between the variables?
4 only
2, 3 and 4
3 and 4
2 only
105
What kind of relationship seems to exist between internet explorer use and murder rate?
Positive Correlation
Cause-Effect
No Correlation
Negative Correlation
106
What kind of relationship seems to exist between cheese consumption and death by bedsheets?
No Correlation
Negative Correlation
Positive Correlation
Cause-Effect
107
What kind of relationship seems to exist between tv size and time watching?
No Correlation
Cause-Effect
Positive Correlation
Negative Correlation
108
A number is an outlier if it is +__ more than standard residuals.
4
3
2.5
2
109
With a NEGATIVE correlation, what happens to one variable if the other one increases?
It decreases
It stays the same
It also increases
There is no relationship
110
Number of sandwiches made and slices of bread left in the package
Negative Correlation
No Correlation
Postive Correlation
111
Use the regression line to predict the hours of exercise for a machine owned 6 months.
6
5.87
5.8
23.8
112
X and Y, have a correlation of 0.3; X and Z have a correlation of -0.7. We know that
X and Y have stronger correlation, since it is positive
We cannot tell which is stronger without more information
the two correlations are equally strong since 1 - 0.7 = 0.3
X and Z have stronger correlation
113
What kind of relationship seems to exist between margerine consumption and divorce rate?
Negative Correlation
No Correlation
Positive Correlation
Cause-Effect
114
A type 1 error is when...
Rejecting the null hypothesis when it is true
Accepting the null hypothesis when it is false
115
What does this table tell you?
if the model fits
if the model is sig
if the slope sig diff from zero
116
What type of R value would this relationship have?
-1
+1
+0.5
0
117
What is multicollinearity?
When correlation is too high
When there is no correlation
when the correlation is NOT sig
118
Which graph has the strongest positive correlation?
D
A
E
F
119
A set of data has a correlation of 0.98. The line of best fit must
have a slope close to 1
increase slowly
cannot be determined
increase steeply
120
Find the equation of the line shown below.
y = 0.33x − 1
y = −3x − 1
y = 3x − 1
y =0.33x + 1
121
This graph shows...
a neutral fit
a bad fit
no fit
a good fit
122
What type of correlation is demonstrated by the scatter plot?
Upward
Positive
Negative
No Correlation
123
The range of values of correlation coefficient is
-1 to 1
-1 to 0
none of these
0 to 1
124
How are these two variables correlated? Education & Income
Positive
Negative
Upward
No Correlation
125
If r=0.3, how much of the variation is explained by the linear model?
Cannot be determined.
90%
9%
30%

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