DIRECTION: 1. Identify the claim or provide a problem statement for each scenario.

2. State the null and alternative hypotheses.

3. Decide what test-statistic is appropriate for each analysis.

CASE 1.Suppose you are developing a marketing plan for an internet service provider and want to determine whether there is a difference in the amounts of time male and female college students spend online each day. After gathering data, you calculated the mean daily times male students and female students spend online and find the difference.

Problem Statement: ______________________________________________________

Null Hypothesis: ______________________________________________________

______________________________________________________

Alternative Hypothesis: ______________________________________________________

______________________________________________________

Test-Statistic: ______________________________________________________

CASE 2.A travel agency claims that the average daily cost of meals and lodging for vacationing in Cebu is greater than the average cost for vacationing in Palawan. To determine whether the claim is true or false, a certain group of travelers asked their friends who had a vacation in Cebu or Palawan about their expenses for food and accommodation.

Problem Statement: ______________________________________________________

Null Hypothesis: ______________________________________________________

______________________________________________________

Alternative Hypothesis: ______________________________________________________

______________________________________________________

Test-Statistic: ______________________________________________________

CASE 3.A shoe manufacturer claims that athletes can increase their vertical jump heights using the manufacturer's new Strength Shoes. The vertical jump heights of eight randomly selected athletes are measured. After the athletes have used the Strength Shoes for 8 months, their vertical jump heights are measured again.

Problem Statement: ______________________________________________________

Null Hypothesis: ______________________________________________________

______________________________________________________

Alternative Hypothesis: ______________________________________________________

______________________________________________________

Test-Statistic: ______________________________________________________

CASE 4.A medical research team conducted a study to test the effect of a cholesterol-reducing medication. At the end of the study, the researchers found that of the 4700 randomly selected subjects who took the medication, 301 died of heart disease. Of the 4300 randomly selected subjects who took a placebo, 357 died of heart disease. Can you support the claim that the death rate due to heart disease is lower for those who took the medication than for those who took the placebo?

Problem Statement: ______________________________________________________

Null Hypothesis: ______________________________________________________

______________________________________________________

Alternative Hypothesis: ______________________________________________________

______________________________________________________

Test-Statistic: ______________________________________________________

CASE 5.A director of alumni affairs at a small college wants to determine whether there is a linear relationship between the number of years alumni classes have been out of school and their annual contributions (in thousands of dollars).

Problem Statement: ______________________________________________________

Null Hypothesis: ______________________________________________________

______________________________________________________

Alternative Hypothesis: ______________________________________________________

______________________________________________________

Test-Statistic: ______________________________________________________