# Question

What is the difference between the normal distributions we’ve seen in previous chapters and

(a) a z-distribution and

(b) a sampling distribution of means?

(a) a z-distribution and

(b) a sampling distribution of means?

## Answer to relevant Questions

(a) What is the standard normal curve? (b) How is it applied to a set of data? (c) What three criteria should be met for it to give an accurate description of the scores in a sample? (a) What is the restriction of range problem? (b) What produces a restricted range? (c) How is it avoided? You want to know if a nurse’s absences from work in one month (Y) can be predicted by knowing her score on a test of psychological “burnout” (X). What do you conclude from the following ratio data? Why can’t you obtain a correlation coefficient greater than ±1? (a) In question 16 what advanced statistical procedures can Poindexter employ to improve his predictions about test errors even more? (b) Say that the resulting correlation coefficient is .67. Using the proportion of ...Post your question

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