1.Assume that the following confidence interval for the difference in the mean length of male (sample 1) and female babies (sample 2) at birth was constructed using independent simple random samples. -0.2 in , or ≠. D. The sample must be a simple random sample.
8.Find the P-value for the indicated hypothesis test. 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 225 fathers from Littleton, yielded 97 who did not help with child care. Find the P-value for a test of the researcher's claim.
A.0.0019
B.0.0038
C.0.0015
D.0.0529
9.Find the value of the test statistic z
A claim is made that the proportion of children who play sports is less than 0.5, and the sample statistics include n = 1320 subjects with 30% saying that they play a sport.
A.-29.66
B.29.66
C.14.53
D.-14.53
10.Formulate the indicated conclusion in nontechnical terms. Be sure to address the original claim. The principal of a middle school claims that test scores of the seventh-graders at his school vary less than the test scores of the seventh-graders at a neighboring school, which have variation described by σ = 14.7. Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms.

A. There is not sufficient evidence to support the claim that the standard deviation is less than 14.7.

B. There is not sufficient evidence to support the claim that the standard deviation is greater than 14.7.

C. There is sufficient evidence to support the claim that the standard deviation is less than 14.7.

D. There is sufficient evidence to support the claim that the standard deviation is greater than 14.7.