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Chapter 12: Q.AP4.2 - Cumulative AP Practise Test (page 827)
If and and events and are independent, what is or ?
а.
b.
c.
d.
e. The answer cannot be determined from the given information.
Correct option is
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Do taller students require fewer steps to walk a fixed distance? The scatterplot shows the relationship between x=height (in inches) and y=number of steps required to walk the length of a school hallway for a random sample of 36 students at a high school.
A least-squares regression analysis was performed on the data. Here is some computer output from the analysis
Section I: Multiple ChoiceChoose the best answer for Questions AP4.1–AP4.40.
AP4.1 A major agricultural company is testing a new variety of wheat to determine whether it is more resistant to certain insects than the current wheat variety. The proportion of a current wheat crop lost to insects is 0.04. Thus, the company wishes to test the following hypotheses:
Do hummingbirds prefer store-bought food made from concentrate or a simple mixture of sugar and water? To find out, a researcher obtains identical hummingbird feeders and fills , chosen at random, with store-bought food from concentrate and the other 5 with a mixture of sugar and water. The feeders are then randomly assigned to possible hanging locations in the researcher’s yard. Which inference procedure should you use to test whether hummingbirds show a preference for store-bought food based on the amount consumed?
a. A one-sample test for a proportion
b. A two-sample test for a difference in proportions
c. A chi-square test for independence
d. A two-sample t-test
e. A paired t-test
Western lowland gorillas, whose main habitat is in central Africa, have a mean weight of pounds with a standard deviation of pounds. Capuchin monkeys, whose main habitat is Brazil and other parts of Latin America, have a mean weight of pounds with a standard deviation of pounds. Both distributions of weight are approximately Normally distributed. If a particular western lowland gorilla is known to weigh pounds, approximately how much would a capuchin monkey have to weigh, in pounds, to have the same standardized weight as the gorilla?
a.
b.
c.
d.
e. There is not enough information to determine the weight of a capuchin monkey.
The swinging pendulum Refer to Exercise 33. Here is a graph of the period versus length, along with output from a linear regression analysis using these variables.
a. Give the equation of the least-squares regression line. Define any variables you use. b. Use the model from part (a) to predict the period of a pendulum with length centimeters.
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