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Statistics - linear relationships Flashcards | StudBud
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Statistics - linear relationships
Statistics - linear relationships
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1
What kind of association is there between height and weight?
positive
none
nonlinear
negative
2
A scatter plot comparing # of posters in a kid's bedroom to # of bananas they eat/week LIKELY
would show no association
would show a nonlinear association
would show a negative association
would show a positive association
3
A study of a new anxiety medicine is graphed with x as # months on drug and y = # panic attacks
People taking the drug longer had decreased panic attacks
The longer people took the drug, the more panic attacks
The results are inconclusive because there is no association
There was no change in panic attacks while on the drug
4
Which of the following is
true
about a good line of best fit:
It forms a bell curve
It intersects all points on the graph
It comes as close as possible to most points on the graph
It shows a high positive or negative association
5
The scatter plot shows there is ___ between years of education and age at birth of first child.
no correlation
a negative correlation
nonlinear correlation
a positive correlation
6
Which of the following would be best displayed on a scatter plot?
hours spent exercising/week and time to run a mile
Number of pets and grade point average
Spread of grades on a math quiz for a class
Favorite soda among middle school students
7
What is the equation for this line?
y = 2x + 3
y = -2x + 3
y = 1/3 x - 4
y = 4/3 x - 4
8
For eastern NC, a scatter plot comparing daily high and low temperatures would likely show
no correlation
negative correlation
nonlinear correlation
positive correlation
9
The missing values A and B are
1 and 4
0 and 2
1 and 5
2 and 6
10
What is the slope of the line?
3
5/3
2/5
2/3
11
Which of the following would most likely have a scatter plot that was nonlinear?
hours spent practicing golf to score on 18 holes
the value of a stock over time
A comparison of miles traveled and gallons of gas used
hours spent studying to grade on an exam
12
Another name for a line of best fit is a
trend line
fad line
time line
fashion line
13
The
y
-intercept of the line is
2
4
1/2
1
14
What is the slope of the line?
2
-1/2
-2
-1/4
15
In study of correlation between # of books read/year and grade in English, what is MOST likely?
negative association
no association
nonlinear association
positive association
16
What kind of association is displayed in the data in the table?
nonlinear
positive
no association
negative
17
In a scatter plot with a positive association, as the x-value increases, the y-value
decreases
increases
increases at first, then decreases
stays the same
18
Trend lines, or lines of best fit, can NOT be applied to scatter plots with
none of these
a positive association
a negative association
nonlinear association
19
A scatter plot comparing hours of sleep in a night to % of free throws missed would LIKELY show
nonlinear correlation
positive correlation
no correlation
negative correlation
20
The slope of the line is
1/2
-2
1
-1/2
21
In the "bell curve" nonlinear scatter plot model
as x increases, y increases first then decreases
as x increases, y decreases
as x increases, y decreases at first then increases
as x increases, y increases
22
The scatter plot depicted shows what kind of association?
no association
negative
nonlinear
positive
23
The scatter plot shows that in general, as unemployment rates increase
property crime increases
property crime remains the same
property crime decreases
none of these can be discerned from the scatter plot
24
The height and weight chart displays a
no correlation
positive correlation
negative correlation
nonlinear correlation
25
In a scatter plot with a negative association, the points slant __________ from left to right.
horizontally
vertically
upward
downward
