university of phoenix
posted by shirley .
4.Suppose you administered an anxiety test to a large sample of people and obtained normally distributed scores with a mean of 45 and standard deviation of 4. Do not use web-calculator to answer the following questions. Instead, you need to use the Z distribution table in Appendix A in Jackson’s book.
d.There are 200 students in a sample. How many of these students will have scores that fall under the score of 41?
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university of phoenix -
The z-score for your 41 is
(41-45)/4 = -1
so use your chart to find the decimal for a standard deviation of -1 (should be .159 depending on the accuracy of your chart)
multiply that by 200