A researcher claims that American adults without children are more likely to experience feelings of loneliness. A survey of 2,527 American adults found that 294 of the 1,223 without children experienced feelings of loneliness and 252 of the 1,304 with children experienced feelings of loneliness. Which of the following is the appropriate test for the researcher’s claim?

A researcher claims that more than 60% of U.S. adults are over their ideal weight. In a survey of 1,050 randomly selected U.S. adults, 651 say they are over their ideal weight. Which of the following is an appropriate test for the researcher’s claim?

The table shows admissions decisions for students who applied to Louisiana State University for the Fall 2011 semester.   LSU Undergraduate Admissions Fall 2011     Admitted Not Admitted Total   Male 5,327 1,352 6,679   Female 6,462 1,677 8,139   Total 11,789 3,029 14,818   If a hypothesis test is conducted at the 0.05 level of significance to determine if the admissions decision is dependent upon gender, how many degrees of freedom are needed?

A researcher claims that the mean systolic blood pressure for women is lower than the mean systolic blood pressure for men.  He selects random samples of 500 women and 500 men. For the sample of women, the mean is 121 mm Hg with a standard deviation of 32 mm Hg, and for the sample of men, the mean is 124 mm Hg with a standard deviation of 30 mm Hg. If a hypothesis test is conducted for the researcher’s claim at the 0.10 level of significance, what type of error could be made?

A nutritionist claims that a low carbohydrate diet helps people to lose weight. To test her claim, she selects a random sample of her clients and provides them with a 4-week low carbohydrate diet plan. The weight of each participant is recorded before starting the diet plan and after completing the plan. Which of the following is an appropriate test for the nutritionist’s claim?

In a study of American men with prostate cancer, the size of each patient’s primary tumor, in square centimeters, was recorded. A random sample of 36 participants in this study was found to have a mean primary tumor size of 17.5 square centimeters and a standard deviation of 15.7 square centimeters. Construct and interpret a 99% confidence interval for the mean primary tumor size of American men with prostate cancer.

Sperm are produced in the _____ and stored in the _____.

Estrogen and progesterone are produced by the _____.

Which one of the following is NOT one of the secondary sex characteristics typical of males:

The penis contains spongy, erectile tissue that fills with _____, causing it to stiffen during sexual arousal.