D:\726933636.doc Page 1 of 1
STUDY GUIDE
TEST 2 CEP640, Spring, 2010
Bring a t-table and a z table to the test. You can find them in the back of your text.
Be sure you can:
1. Use a z table to find the percent of cases above or below a given z score.
2. Sketch the normal curve and put a dot at the spot to roughly correspond to a given z-score.
3. Carry out a z test if I give you the population mean, population SD, sample mean, sample N.
4. Calculate standard error of the mean and the z if you have the above.
5. Calculate the z if you have the above.
6. Determine whether a given z in a z test is significant or nonsignificant at the .05 and .01 levels.
7. Look at an SPSS printout of a one-sample t-test and tell whether or not it is significant and in what direction.
8. Convert a z score to another standard score with a specified new mean and standard deviation.
9. Solve the type of t score we did in class using the bottleing example if I specify different numbers.
10. Calculate a one-sample t test if I give you the mean of the population, the mean of the sample, the SD of the sample, and the N of the sample.
11. Look up the critical t in a t table if I give you the number of cases.
12. Look at a calculated t and decide if the test was significant if I give you the critical t.
13. Explain that the standard error of the mean is really the standard deviation of a comparison distribution in which each plotted point represents a mean rather than an individual score.
14. Explain why if you start with a population that is not at all normal and pull a large number of random samples of the same size from that population, calculate the mean of each sample, and graph the resulting distribution of means, that distribution will be normal.
15. Tell me if a distribution is skewed negatively or positively if I tell you which end of the curve the scores are piling up at.
16. Interpret the printout from a one sample t-test.
17. Tell whether a t value is significant or not if I give you the sig. from an spss printout (For example, twotailed sig. = .002, .08, .23, .35, etc.)
18. Know when we use a z test and when we use a t test to test the difference between means.
Bring a pencil and a calculator to class.