Indicate whether each statement below is true or false. If false, describe why.

a) Requesting viewers to call into an 800 number is a good way to produce a representative sample.

Indicate whether each statement is true or false. If you think the statement is false, rewrite it to make it true.

The equation below shows the formation of a cation.

An online investment blogger advises investing in mutual funds that have performed badly the past year because "regression to the mean tells us that they will do well next year." Is he correct?

A survey of major universities asked what percentage of incoming freshmen usually graduate "on time" in 4 years. Use the summary statistics given to answer the questions that follow.

$$\begin{array}{l|c} & \% \text { on Time } \\ \hline \text { Count } & 48 \\ \text { Mean } & 68.35 \\ \text { Median } & 69.90 \\ \text { StdDev } & 10.20 \\ \text { Min } & 43.20 \\ \text { Max } & 87.40 \\ \text { Range } & 44.20 \\ \text { 25th \%tile } & 59.15 \\ \text { 75th \%tile } & 74.75 \end{array}$$

Create a boxplot of these data.

Consider each of these situations. Do you think the proposed sampling method is appropriate? Explain. a) We want to know what percentage of local doctors accept Medicaid patients. We call the offices of 50 doctors randomly selected from local Yellow Pages listings. b) We want to know what percentage of local businesses anticipate hiring additional employees in the upcoming month. We randomly select a page in the Yellow Pages and call every business listed there.

For the given observational study, indicate whether they are prospective or retrospective studies.

a) An airline was concerned that new security measures might discourage air travelers. A year after the new security restrictions were put into place, the airlines compared the miles traveled by their frequent fliers before and after the transition.

An environmental advocacy group is interested in the perceptions of farmers about global climate change. Specifically, they wish to determine the percentage of organic farmers who are concerned that climate change will affect their crop yields. They use an alphabetized list of members of the Northeast Organic Farming Association (www.nofa .org), a nonprofit organization of over 5000 members with chapters in Connecticut, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, and Vermont. They use Excel to generate a randomly shuffled list of the members. They then appoint members to contact from this list until they have succeeded in contacting 150 members.

b) Find the sampling frame?

For your marketing class, you'd like to take a survey from a sample of all the Catholic Church members in your city to assess the market for a DVD about Pope Francis's first year as pope. A list of churches shows 17 Catholic churches within the city limits. Instead, try to obtain a list of all members of all these churches, and you decide to choose 3 churches at random. For those churches, you'll ask to get a list of all current members and contact 100 members randomly.

a) What kind of design have you used?

An online investment blogger advises investing in mutual funds that have performed badly the last year because "regression to the mean tells us that they will do well next year." Is he correct?

An intern is working for Pacific TV (PTV), a small cable and Internet provider, and has proposed some questions that might be used in the survey to assess whether customers are willing to pay $\$ 50$ for a new service.

Question I: If PTV offered state-of-the-art, big-speed Internet service for $\$ 50$ per month, would you subscribe to that service?

Question 2: Would you find $\$ 50$ per month-less than the cost of a daily cappuccino-an appropriate price for big-speed Internet service?

b) Which one has more neutral wording? Describe.

An environmental advocacy group is interested in the perceptions of farmers about global climate change. Specifically, they wish to determine the percentage of organic farmers who are concerned that climate change will affect their crop yields. They use an alphabetized list of members of the Northeast Organic Farming Association (www.nofa .org), a nonprofit organization of over 5000 members with chapters in Connecticut, Massachusetts, New Hampshire, New Jersey, New York, Rhode Island, and Vermont. They use Excel to generate a randomly shuffled list of the members. They then appoint members to contact from this list until they have succeeded in contacting 150 members.

a) Find the population?

As the new manager of a small convenience store, you want to understand the shopping patterns of your customers. You randomly sample 20 purchases from yesterday's records (all purchases in U.S. dollars):

b) Find the quartiles using Tukey's method.

Indicate whether the given event is independent or not. Describe briefly.

b) Successive measurements of your heart rate as you exercise on a treadmill.

A survey of major universities asked what percentage of incoming freshmen usually graduate "on time" in 4 years. Use the summary statistics given to reply to the question.

a) Would you describe this distribution as symmetric or skewed?