For each of the following research questions, identify (by letter) the test that you would use to investigate that question. Explain your answer choice. A. One-Sample T-Test for the Mean B. One-Sample Z-Test for Proportions C. Two-Sample Z-Test for Proportions D. Two-Sample T-Test for Means (Independent) E. Two-Sample T-Test for Means (Matched Pairs)

1. The manager of a company's human resource department examines employee attendance records to investigate whether more than 20% of employee sick days are taken on Fridays.

2. A researcher is interested in studying whether Americans gained weight, on average, while in quarantine by virtue of the COVID-19 pandemic. She took a random sample of Americans and asked their weight before the pandemic and their weight in mid-2021 (after quarantine).

3. A recent survey investigated whether American adults who have children are significantly more likely to play video games than American adults who do not have children.

4. A lawyer is interested in investigating whether time served in prison for men on average differs than the time served for women.

5. Health recommendations suggest walking 10,000 steps per day. Suppose that you collect data from a sample of Fitbit users and you want to test if they average more than 10000 steps per day.

6. A researcher is interested in determining if iPads in the classroom can impact how long students take to write notes. In one of her classes, she records how long it takes students to write down notes for a lesson without using an iPad and then records how long it takes the same students to write down notes while using an iPad.

7. The manager of a restaurant wants to investigate whether playing background music might affect how much customers spend for their meals. For a period of several weeks, he randomly decides each night whether to play music or no music in the background. Then he keeps track of how much each party spends for their meals.

8. An economist is interested in studying the proportion of shoppers who spend more than $5,000 during a holiday season.

9. A student in a statistics class is interested in testing whether the average on a statistics exam is higher than 85.

10. The real estate agent examines the average home price before and after homeowners installed a pool in their backyard to see if pools affect home values.