Posted: December 29th, 2016

Use the following data for a large sample (N=500) of undergraduate psychology majors. On a test of math anxiety, the mean is 45 and the standard deviation is 7. Draw a normal curve and insert the z scores along the bottom line. Insert the raw scores in another line under the curve, and then insert the percentile ranks in another line under the z score line.

Express probabilities and percentages in decimal form, rounded to four decimal places. Use a z table if necessary. Show all work.

The semi interquartile range (middle 50%) scores between what two numbers? from ___ to ___?

The top 10% of the population scores over what raw score in math anxiety?

The bottom 1/2 percent of the population scores under what raw score in math anxiety?

The extreme 5% of the population scores above what raw score and below what raw score in math anxiety? below ____ and above ____?

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