# Psych Stats Test 2 MC Review

## 18 terms

### If a distribution is symmetrical, then it MUST be A. Normal B. BiModal C. Rectangular D. It doesn't have to be any particular one above.

D. It doesn't have to be any particular above

### A sample in which the distribution of scores matches that in the population of interest is called a _____ sample. A. matched B. random C. convenience D. representative

D. Representative

B. Random

### We use a _____ to draw conclusions about a ______. a. mean,variance b. population, sample c. sample, population d. ouija board

C. Sample, Population.

C Sample Mean

### If your results are statistically significant, this means A. the research hypothesis is proven true B. the null hypothesis is proven false C. both of the above D. Neither of the Above

D. Neither of the above

### Suppose you draw many samples from a population and find the mean of each of them. The resulting distribution of means will have a mean and standard deviation of its own. We can say what about this distribution of means? A. Its mean will be very nearly the same as that of the population from which the samples were drawn. B. The standard deviation will be nearly the same C. both D. neither

A. Its mean will be very nearly the same as that of the population from which the samples were drawn.

### The Central Limit Theorem states that a sampling distribution will be normal A. If the population from which the samples are drawn is normally distributed B. If the population from which the samples are drawn is positively skewed C. If the size of the samples is greater than 20 D. If the size of the samples is greater than 30

A. If the population from which the samples are drawn is normally distributed

### The standard error of the mean is defined as A. the range of scores in a population B. the variance of scores in a population C. the standard deviation of scores D. The standard deviation of a distribution of means

D. The standard deviation of the distribution of means

### When you draw samples from a population, which of the following factors would result in a smaller standard error of the mean? A. a smaller sample size B. a larger sample size C. a larger population standard deviation D. none of the above

B. a larger sample size

### If you expect a treatment to cause an increase in scores, your hypothesis is _________ and you should use a ______ test A. directional, one-tailed B. directional, two-tailed C. non directional, one-tailed D. non directional, two-tailed

A. directional, one-tailed

### When testing a hypothesis if you obtain a Z value that is too small to be significant, you should do which of the following? A. Reject the null hypothesis B. Retain the null hypothesis C. Reject the research hypothesis D. If your hypothesis was non-directional, change to a directional prediction.

B. Retain the null hypothesis

### A Type 2 Error Occurs when you incorrectly A. Retain a true null hypothesis B. retain a false null hypothesis C. Reject a true null hypothesis D. reject a false null hypothesis

B. Retain a false null hypothesis

A. a(alpha)

A. a

C. p<.001

A. p<.05

### Which of the following would have the effect of making the confidence interval larger (broader)? A. decrease the confidence level from 99% to 95% B. use a larger sample size C. Either of the Above D. Neither of the above

D. Neither of the above