Which of the following are true statements? I. Voluntary response samples often under-represent people with strong opinions. II. Convenience samples often lead to under-coverage bias. III. Surveys with confusing wording are likely to have response bias.   I and II I and III II and III I, II, and III

The Way of the World makes use of “stock characters”, which of the following is not a “stock character”?

In a certain industry, 15 percent of the workers showed some signs of ill effects due to radiation. After management claimed that improvements had been made, 23 of 140 workers tested experiences some ill effects due to radiation. Use a 0.01 level of significance to conduct a test to determine if in fact the managements improvement claims are correct. Show all work for full credit. a. State the null and alternate hypotheses. b. Compute the test statistic. c. Find the critical value and/or the p value. d. Make a decision and justify it using the critical value and/or the p-value. e. Record an appropriate conclusion in context of this problem.  

If a hypothesis is not rejected at the 5% level of significance is

In order to assess the effects of exercise on reducing cholesterol, a researcher sampled 50 people from a local gym who exercised regularly and 50 people from the surrounding community who did not exercise regularly. They each reported to a clinic to have their cholesterol measured. The subjects were unaware of the purpose of the study, and the technician measuring the cholesterol was not aware of whether subjects exercised regularly or not.

Fill in the missing words to the quote: “Statistical methods may be described as using ________________ drawn from _______________ to make conclusions about ___________________________.”

A random variable X has a probability distribution as follows: X 0 1 2 3 P(X) 2k 3k 13k 2k The P(X < 2.0) is equal to:

Which of the following is not a concern in data collection?

You randomly choose a marble from a jar. The jar contains 3 red marbles, 10 blue marbles, 8 green marbles, and 4 yellow marbles. What is the probability that you select a blue marble?

A random variable X has a probability distribution as follows: X 0 1 2 3 P(X) k 5k 10k 4k   Then the P(X