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# Do you jog The Gallup Poll once asked a random sample of ISBN: 9781429245593 85

## Solution for problem R7.4 Chapter 7

The Practice of Statistics | 4th Edition

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Problem R7.4

Do you jog? The Gallup Poll once asked a random sample of 1540 adults, Do you happen to jog? Suppose that in fact 15% of all adults jog. (a) What is the mean of the sampling distribution of p? Justify your answer. (b) Find the standard deviation of the sampling distribution of p. Check that the 10% condition is met. (c) Is the sampling distribution of p approximately Normal? Justify your answer. (d) Find the probability that between 13% and 17% of a random sample of 1540 adults are joggers. Show your work. s Use the sampling distribution of p to evaluate a claim about a population proportion.

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Unit 1.5 Sampling bias- Technique used to obtain samples individually tends to favor one part of the population over the other -also results from undercoverage (when the proportions of one segment of the population is lower in a sample than actual population) -can result if frame used to get a sample is incomplete or not representative of the population (eg. Registered voter...

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##### ISBN: 9781429245593

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