1. Intro to Stats and Collecting Data

Examine the following p chart for defective calculator batteries and briefly describe the action that should be taken.

Histogram of Interarrival Times Construct the histogram that corresponds to the frequency distribution from Exercise 1. Use class midpoint values for the horizontal scale. Does the histogram suggest that the data are from a population having a normal distribution? Why or why not?

In Exercises 1 and 2, use the following wait times (minutes) at 10:00 AM for the Tower of Terror ride at Disney World (from Data Set 33 “Disney World Wait Times” in Appendix B).

35 35 20 50 95 75 45 50 30 35 30 30

g. What level of measurement (nominal, ordinal, interval, ratio) describes this data set?

Determine whether the statement is true or false. If it is false, rewrite it as a true statement.

Inferential statistics involves using a population to draw a conclusion about a corresponding sample.

Determine whether the statement is true or false. If it is false, rewrite it as a true statement.

A sample statistic will not change from sample to sample.

Researchers in Japan tested the effect of cannabidiol (CBD) in treating late teenagers with social anxiety disorder (SAD). Thirty-seven 18- to 19-year-old teenagers with SAD took part in the study. The patients were assigned at random to receive a daily dose of either CBD or a placebo for 4 weeks. Symptoms were measured using The Fear of Negative Evaluation Questionnaire and the Liebowitz Social Anxiety Scale at the beginning and end of the treatment. (Source: Frontiers in Psychology)

a. Identify the experimental units and treatments used in this experiment.

Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.

In a survey of 1000 household food purchasers, 24.7% say that they avoid meat, dairy, and eggs produced by animals living in confined conditions. (Source: FoodPrint)

Which part of the survey described in Exercise 3 represents the descriptive branch of statistics? Make an inference based on the results of the survey.

Determine whether the data are qualitative or quantitative. Explain your reasoning.

The zip codes of a sample of 200 customers at a sporting goods store

Determine whether the data are qualitative or quantitative. Explain your reasoning.

The marital statuses of the employees of a casino

Determine the level of measurement of the data set. Explain.

The total compensations (in millions of dollars) of the ten highest-paid CEOs at U.S. public companies are listed. (Source: 24/7 Wall St.)

280.6 66.9 42.9 36.5 34.3 31.6 31.6 28.8 26.4 25.8

Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.

A survey of 919 college board members found that 89% think that their institution is a good place for members of racial and ethnic minorities. (Source: Association of Governing Boards of Universities and Colleges)

Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.

In January 2021, 54% of the governors of the 50 states in the United States were Republicans. (Source: National Governors Association)

Determine whether the number describes a population parameter or a sample statistic. Explain your reasoning.

Voter registration records show that 47% of all voters in a county are registered as Democrats.

A study showed the same level of T cell production in senior citizens who are amateur cyclists as in young adults, but a significantly lower level of T cell production in senior citizens who do not exercise regularly. Is it appropriate to infer that exercise stimulates T cell production? Explain. (Source: University of Birmingham)