Test 4C
AP Statistics
Name:
Directions:
Do all of your work on these sheets.
Part 1:
Multiple Choice.
Circle the letter corresponding to the best answer.
1.
There is a positive association between the number of drownings and ice cream sales. This is an
example of an association likely caused by:
(a) Coincidence
(b) Cause and effect relationship
(b) Confounding factor
(d) Common response
(e)
None of the above
2.
If the correlation between body weight and annual income were high and positive, we could
conclude that:
(a)
High incomes cause people to eat more food.
(b) Low incomes cause people to eat less food.
(c)
Highincome people tend to spend a greater proportion of their income on food than low
income people, on average.
(d) Highincome people tend to be heavier than low income people, on average.
(e)
High incomes cause people to gain weight.
3.
A study examined the relationship between the sepal length and sepal width for two varieties of an
exotic tropical plant.
Varieties A and B are represented by x's and o's, respectively, in the
following plot:
Which of the following statements is FALSE?
(a)
Considering variety A alone, there is a negative correlation between sepal length and sepal
width.
(b) Considering variety B alone, the least squares regression line for predicting sepal length from
sepal width has a negative slope.
(c)
Considering both varieties together, there is a positive correlation between sepal length and
sepal width.
(d) Considering each variety separately, there is a positive correlation between sepal length and
sepal width.
(e)
Considering both varieties together, the least squares regression line for predicting sepal length
from sepal width has a positive slope.
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 Winter '10
 scruble
 Least Squares, Linear Regression, Regression Analysis, Household income in the United States, Sepal Length, Sepal Width

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