Question

18. Find the area under the normal curve between z--1.25 and z-1.0 a) .7486 19. If IQ scores are normally distributed with a mean of 100 and a standard deviation of 15, find the proportion of scores less than 88 a) .3173 20. Same as above except find the proportion of scores greater than I standard deviation from the mean. a) .3173 21. Consider a university with a population mean GPA of 2.95, a standard deviation of.2, and a sampling distribution of all possible samples of size 100. The mean of the sample means is equal to: a) 2.45 22. Same as above, the standard deviation of the sample means is equal to: a) 2.45 What is the effect of choosing a larger sample size for the sampling distribution? a) mean increases, standard deviation unchanged 23. As sample size increases, ơ, and the sampling distribution of the mean will have relatively little dispersion resulting in sample means falling relatively the population mean a) increases, far fromm 24. 25. Given a test statistic of 2,09 paired with a critical z-score of 1.65 on a one tailed test, then the conclusion IS is a) fail to reject Ho, at α = 1%

Answer 1

18 乙ㄧ-1.SS and Z-l. O 8413 0.oS6 standard deviationニσ--IS 38 1o0 乙く one queshoat a please