1. Read the following then choose the appropriate test and name the population(s).

A researcher asks a random sample of 200 college students whether they used an e-textbook for any of their classes last semester. He wants to determine whether the proportion of college students who used e-textbooks is more than 0.25. Classify this problem.

Group of answer choices

a) Two- proportion z- test; the population is the 200 college students surveyed.

b) One- proportion z- test; the population is all college students.

c) Two- proportion z- test; one population is all college students who use e-textbooks and the other population is all college students who do not use e-textbooks.

d) One- proportion z- test; the population is all college students who use e-textbooks.

e) None of these answers.

2. A true/false test has 25 questions. A passing grade is 70%. Find the approximate probability that a person who is just guessing will pass the test.

3. A Gallup Poll of 1020 US adults found that 821 respondents wanted Congress to pass a bill for mandatory labeling of products containing GMO. Find the 95% confidence interval for the population percentage in favor of passing a bill for mandatory labeling of products containing GMO.

4. In a recent poll of 800 randomly selected home delivery truck drivers, 28% said they had encountered an aggressive dog on the job at least once. What is the standard error for the interval of confidence for the proportion of all home delivery truck drivers who have encountered an aggressive dog on the job at least once?

5. Complete the statement by filling in the blank. When constructing a confidence interval, if the level of confidence increases the margin of error will ________________ and the confidence interval will be ______________ . A larger sample size will improve the accuracy of the confidence interval, therefore margin of error will ___________ and the confidence interval will be ___________.

a) Decrease, narrower. Increase, wider.

b) Increase, wider. Decrease, narrower.

c) Increase, narrower. Decrease, wider.

d) Decrease, wider. Increase, narrower.

e) None of these answers.

6. Among 1500 randomly selected male car occupants over the age of 16, 68% wear seatbelts. Among 1600 randomly selected female car occupants over the age of 16, 72% wear seatbelts. At 5% significance level test the claim that both genders have the same rate of seatbelt use. Classify the problem as:

7. There are four colors in a bag containing 160 plastic chips. It is known that 25% of the chips are green. On average, how many chips from a random sample of 60 (with replacement) would be expected to be green?