STATS 7 Chapter Notes - Chapter 7: Confidence Interval, Sampling Distribution, Standard Deviation
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Chapter 11, exercises 3, 29, 30, 34ad, 37, 46, 48, 50abc, 52abcd, and 60a. It would be better to use an independent sample since individuals in each age group can have other variables that affect their memorization. b. ) Standard error of the sample mean (x bar) = s/ (rad n) = 6/ rad(9) = 2. In the random sample n = 9 men who are between 30 and 39 years old, the amount of sit-ups they can do per minute varies by 2 sit-ups. It is the standard deviation of the sample size n = 9 in that sampling distribution. b. ) Standard error of the sample mean (x bar) = s/ rad(n) = 4. 5 / rad(81) = 0. 5. In the random sample n = 81, this sampling distribution has a standard deviation of. The variation in this sampling distribution is 0. 5 years of age. b. ) 95% confident that, on average, the entire population of university students spends.
