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a) Describe the sampling distribution of p-hat, the sample proportion of college students with the cell phones who send or receive the text messages with their phones.
b) What is the probability that 154 or fewer college students in the sample send and receive text messages with their cell phones? Is this result unusual?
Explain whether the authors used a population or a sample. Explain how this could have affected the results. If a sample was used, was it representative of the entire population? Why or why not?
A sociologist wants to describe if the life expectancy of people in Africa is lesser than the life expectancy of people in Asia.
Use each decision criterion (maximin, maximax, minimax regret, expected value) to determine the price that Pizza King should charge.
Generate a 95% confidence interval for the difference in mean HDL levels between men when exercise regularly and those who do not.
A researcher studies the average distance that 130 people who are living in U.S. urban areas walk each week: What is the size of the sample? Identify the population.
A random sample of 12 single men were asked if they would welcome a woman asking them for a date. using the binomial probability table, find the probability that: none of the men will say yes.
If you select a random sample of 100 voters, what is the probability that a candidate will be forecast as the winner when. The true percentage of her vote is 50.1%?
Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.
Explain what these terms mean in describing the distribution of the sales reps' salaries.
A quadratic revenue function often occurs in practice. The reason is that as more units are produced, the price must be lowered in order to sell them all.
Two different simple random samples are drawn from two different populations. The first sample consists of 20 people, with 10 having a common attribute.
A deck of playing cards contains 52 cards, four of which are aces. What is the probability that deal of a five-card hand provides?
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