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
B)0.1151
C)0.4938
D)0.9938

Question

Quizplus · Accepted Answer

The probability can be found using a z-score calculation. The z-score is (10 - 7) / 1.20 = 2.5. Using a standard normal distribution table, the probability of obtaining a z-score of 2.5 or higher is approximately 0.0062.

A Student Wanted to Know Whether Memory for Items on a Grocery