What is the probability of getting a sample mean between 500 and 520 if the population mean is 500 and the standard deviation of the sampling distribution (the standard error of the mean) is 20?
a. 0.5000 c. 0.3413
b. 0.4332 d. 0.1915
Question 2
A student wanted to know whether memory for items on a grocery list was better when a bizarre image was created for each item, compared with a strategy of simply trying to remember the items. The student had a randomly selected sample use bizarre imagery to remember a list of 15 items; the mean number of items remembered was 10 . The student compared this mean to a population mean of 7 and a standard error of 1.20 . What is the probability of obtaining a sample mean of 10 or higher?
a. 0.0062 c. 0.4938
b. 0.1151 d. 0.9938
Genetic drift and population size.
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