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10104 '7

10:04 Ch 7 Probability and Sa... I. 2. 3. 4. Dashboard Chapter 7 Problems from Gravetter and Wallnau (2014) A population has standard deviation of 24. a. On average, how much difference should exist between population mean and the sample mean for n= 4 scores randomly selected from the population? b. On average, how much difference should exist for a sample of n= 9 scores? c. On average, how much difference should exist for a sample of n= 16 scores? The scores on a standardized mathematics test for 8th grade children in New York State from a normal distribution with a mean of 100 and a standard deviation of 10. a. b. c. What proportion of the students in the state have scores less than X=75? If the sample of n: 4 are selected from the population, what proportion of the samples will have means less than M= 75? P(M < 75)? If samples of n: 25 are selected from the population, what proportion of the samples will have means less than M= 75? P(M < 75)? A population of scores forms a normal distribution with a mean of 80 and a standard deviation of 10. a. b. c. What proportion of the scores have values between 75 and 85? P(75