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Statistics Extra Credit Chapters 1-5 Flashcards | StudBud
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Statistics Extra Credit Chapters 1-5
Statistics Extra Credit Chapters 1-5
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1
A distribution for basketball scores is N(70,25) What proportion of scores are greater than 40?
.6754
.8849
.8630
.2222
2
The Standard Normal Curve has an area of 1 underneath it.
False
True
3
What is the equation of the least-squares regression line for predicting GPA from IQ?
ŷ=-3.55+1.01x
ŷ=-2.34+.101x
ŷ=-3.55+.101x
ŷ=3.55+.101x
4
The correlation coefficient is unitless.
True
False
5
What line is used to predict the value of y for a given x value?
Perpendicular line
Least-squares regression line
Regression line
Intersecting line
6
Rental values of apartments close to the city are 470,600,580,550. State the standard deviation
$31.15
$49.50
$58.07
$100.00
7
What other type of graphical display is appropriate for test scores, other than a histogram?
A table
Scatterplot
Pie Chart
Stemplot
8
The form of the relationship in the scatterplot below can be described as
Negative association
Extreme association
No association
Positive association
9
In drawing a histogram, which of the following suggestions should be followed?
Leave large gaps between the bars
The heights of the bars should equal the class frequency
The bars should be square
The bars need to be color coded
10
When a distribution is skewed, is the mean resistant?
Only when the distribution is skewed right
No, it gets pulled in the direction of the "tail"
Yes, it does not get pulled
The mean changes when a distribution is skewed
11
SAT Math Scores at WH: Mean:610, Standard Deviation:60. What is the range in the middle 68%?
550-670
610-700
430-480
200-260
12
What is the response variable in the problem below?
Number of burglaries committed
Whether or not gun ownership is required by law
Number of guns owned
How small the town was in which the crime was committed
13
A five number summary includes all of the following except...
Q1 & Q3
Minimum
Standard Deviation
Maximum
14
What is the difference between outliers and influential points?
Outliers move line up & down,influential points change slope
Outliers change slope and influential points do not
Outliers change slope, influential points move line
There is no difference
15
What is the mean for this set of data? 5,12,13,15,18,19,30,6,20
15.77
12
24.65
15.33
16
Mean:68.8in & Standard Deviation:2.2in. What range of heights will put males in the middle 50%?
67.126"-70.074"
68.558"-69.102"
70.461"-71.874"
54.26"-58.323"
17
What direction are residuals measured in?
Vertical
All the above
Horizontal
Diagonal
18
A histogram that is described to be unimodal means...
There are gaps
Has 2 distinctive peaks
Has 1 distinctive peak
Has no peaks
19
Which of the following represents a Quantatative Variable?
The eye color of everyone in your class
The hair color of everyone in your class
Area code
The heights of everyone in your class
20
What four things should be discussed when describing a scatterplot?
Form, strength, direction,outliers
Form,strength,shape,outliers
Form,strength,height,direction
Height, length,shape,form
