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1. Back to school, again. Based on the 74% national retention rate described in Exercise 31, does a college where 522 of the 603 freshman returned the next year as sopho- mores have a right to brag that it has an unusually high retention rate? Explain.
2. Binge sample. After hearing of the national result that 44% of students engage in binge drinking (5 drinks at a sitting for men, 4 for women), a professor surveyed a random sample of 244 students at his college and found that 96 of them admitted to binge drinking in the past week. Should he be surprised at this result? Explain.
3. Polling. Just before a referendum on a school budget, a local newspaper polls 400 voters in an attempt to predict whether the budget will pass. Suppose that the budget actually has the support of 52% of the voters. What's the probability the newspaper's sample will lead them to predict defeat? Be sure to verify that the assumptions and conditions necessary for your analysis are met.
q1 a researcher suggests that male nurses earn more money than female nurses. a survey of 16 male and 20 female
Are the following workers more likely to experience short-term or long-term unemployment? Explain.
Problem: Two rainstorms occurred in one week in a certain area. In the first storm 30 ml of rain fell per hour, and in the second storm 20 ml of rain fell per hour.
Determine the frequencies expected if the two variables, status regarding lab techniques course and laboratory performance, are independent.
the cardboard bales produced at a local recycling depot have an average weight of 400kg with a standard deviation of
A collection of all the test scores for a standardized, post-secondary examination administered in the 1970's across countries along the West African coast, is well-modeled as a random variable X ∼ N (μ, σ2) with μ = 270 and σ = 26.
Probability of a flush. Poker player holds flush when all 5 cards in hand belong to same suit (clubs, diamonds, hearts, or spades).
What is the p-value associated with the sample results? What is your conclusion based on the p- value?
the manufacturer of a new toothpaste claims that the new product helps whiten teeth. sixty subjects were randomly
Compute the average time between calls and compare this value with the expected value of the time between calls from the probability distribution. Why are the result different
comparing variationcalculating percentiles a data set consists of the 85 ages of women at the time that they won an
Let x = number of the ball obtained on any selection. Then the probability distribution for x is given by:
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