Question

BASIC STATS FOR PSYCHOLOGY

Conceptual Questions

a. When samples are taken at random and the sample sizes are reasonably large the sampling distribution of the mean will always be _____________.

b. All other things being equal, as the sample size ____________, the standard error of the mean will decrease.

c. To use the z test to compare means, one must know the population mean, the __________, and the_________.

Answer 1

a.The central limit theory states that when the sample sizes are reasonably large the sampling distribution of the mean follow a normal probabiity distribution and tend to cluster around the true population mean.

Answer. Normal.

b. The standard error of the mean which is also called the standard deviation of the mean becomes smaller when the sample size increases.

Answer. increases.

c. Z test is used for large sample to compare means. For one must know the the population mean, the size of the sample and the standard deviation.

Answer. size of the sample, standard deviation.