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IQ
Suppose you have a data set with IQ levels of some students who perform well in quizzes and some students who are excellent athletes.
Which group of students do you think would have a higher standard deviation of IQ levels? Explain.
For opinion polls like this, which has more variability: the percentage of respondents answering "yes" in either year or the difference in the percentages.
assume you plan to construct a 95 confidence interval. the numbers of online applications from simple random samples of
in the telephone survey technique introduced in exercise 6.5 what is the probability of two or fewer successful calls
we asked subjects how many siblings they had and what their average test score was in their geography class. draw a
a) What's the probability of no hurricanes next year? b) What's the probability that during the next two years, there's exactly 1 hurricane?
The time between breakdowns of aging machines is known to be exponentially distributed with a mean of 25 hours. The machine has just been repaired.
Using a 3-month weighted average with the most recent month weighted 0.60, the next most recent month weighted 0.30, and the third month weighted 0.10, forecast the fund price for month 21.
For safety purposes, the 'maximum capacity' of this elevator is stated as '13 persons, or 1000kilograms'. What is the probability that this group of twelve students exceed the maximum weight capacity of the elevator?
Find the mean for each of the variables R, High and Low. Verify that the mean for R equals the difference between the means for High and Low.
two dice are tossed. let a be the event that the sum is 7. let b be the event that first die is 6. let c be the event
Random samples of 25 observations were selected from each of 3 populations. For these data, SSTR= 120 and SSE = 216.
Assuming that the surveyed subjects are a random sample of U.S. millionaires, give a 99% confidence interval for the average net worth of U.S. millionaires.
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