**Question: ** Compute the percentage of the normal curve located at or above each of the following z values.

a. 1.50

b. – 1.50

c. – 0.86

d. 0.00

e. 1.46

f. – 0.50

**Question: **What is your percentile rank if you got 115 on the IQ test (a mean of 100, a standard deviation of 15)?

Question: What are linking (lurking) variables? Outline a case where a linking (lurking) variable could cause a problem.

Question: If r = 0.875, what is the coefficient of determination?

**Question: **A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. Find the standard (z) score for a sample value of 40.

**Question: **Describe and give examples of research questions for which external validity is a primary concern. Describe and give examples of research questions in which internal validity is a primary concern.

**Question: **What do inferential statistics allow you to infer?

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