
AP Statistics Confidence Interval for Slope
Authored by Anthony Clark
Mathematics
12th Grade

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10 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which confidence would result in a wider interval (assuming nothing else changed), 91% or 97%?
97%, z* is larger for higher confidence intervals
97%, the standard error is larger for higher confidence intervals
91%, z* is larger for lower confidence intervals
91%, the standard error is smaller for lower confidence intervals
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What do we use to estimate unknown parameters?
Hypothesis Test
Confidence Interval
Trig Identity
Guess and check
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Raoul performed an experiment using 16 windup rubber band single-propeller airplanes. He would up the propeller a different number of times and recorded the amount of time (in seconds) that the airplane flew for each number of rotations that the propeller was wound. Which of the following is a 95 percent confidence interval for the slope of the regression line that relates the number of rotations to the plane's flight time?
0.0462 ± (2.145)(0.01565)
0.924 ± (2.145)(0.6413)
0.0462 ± (2.96)(0.01565)
0.924 ± (2.96)(0.6413)
0.0462 ± (2.131)(0.01565)
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
A
B
C
D
E
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Park rangers are interested in estimating the weight of the bears that inhabit their state. The rangers have data on weight (in pounds) and neck girth (distance around the neck in inches) for 10 randomly selected bears. Here is some computer output from a linear regression analysis of these data. Which of the following represents a 95% confidence interval for the slope of the population least-squares regression line relating the weight of a bear and its neck girth, assuming the conditions for inference are met?
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Which of the following changes to a study would result in a narrower confidence interval?
increasing the confidence level, increasing the sample size
decreasing the confidence level, decreasing the sample size
increasing the confidence level, decreasing the sample size
decreasing the confidence level, increasing the sample size.
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