1. A sample size of n = 70 is drawn from a population with proportion p = 0.32. Let p̂ be the sample proportion.
2. On a certain television channel, 20% of the commercials are local advertisers. A sample of 150 commercials is selected. Would it be unusual for more than 26% of the commercials to be local advertisers? Be sure to support your answer.
3. In a sample of 78 young adults, the average time per day spent sleeping was 7.09 hours. Assume the population standard deviation is 1.15 hours.
4. According to a national report, a sample of 95 men aged 20-29 years had a mean waist size of 36.7 inches with a standard deviation of 8.9 inches.
5. If we increase the confidence level and keep the sample size the same, we (circlene) increase / decrease the margin of error.
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