If r = zero, then .
a. 0.=sY X
b. 1.00.= +sY X
c. sY .X = sY
d.
sY .X cannot be calculated
Question 2
True or False: In a hypothesis test regarding a population mean, the probability of a type II error, , depends on the true value of the population mean.
A) False B) True
Question 3
True or False: In a hypothesis test, an increase in will cause a decrease in the power of the test provided the sample size is kept fixed.
A) False B) True
Question 4
A nationwide study of American homeowners revealed that 64 have one or more lawn mowers.
A lawn equipment manufacturer, located in Omaha, feels the estimate is too low for households in Omaha. Can the value 0.64 be rejected if a survey of 490 homes in Omaha yields 331 with one or more lawn mowers? Use
Question 5
An article in a journal reports that 34 of American fathers take no responsibility for child care.
A researcher claims that the figure is higher for fathers in the town of Littleton. A random sample of 234 fathers from Littleton yielded 96 who did not help with child care. Test the researcher's claim at the 0.05 significance level.
Question 6
In a hypothesis test, which of the following will cause a decrease in , the probability of making a type II error?
A: Increasing while keeping the sample size n, fixed
B: Increasing the sample size n, while keeping fixed
C: Decreasing while keeping the sample size n, fixed
D: Decreasing the sample size n, while keeping fixed
A) C and D B) A and D C) B and C D) A and B
