Stats

The formula for changing a Z score to a raw score is....

(Z) (SD) + M = X

The conventional levels of significance in hypothesis testing in Psychology are...

.01 and .05

If the cutoff Z score on the comparison distribution is +/- 2.31, a psychologist can reject the null hypothesis if the sample Z score on this distribution is....

2.83

The formula for changing the raw score to a Z score is....

X-M/SD = Z

If an organizational psychologist conducts extensive interviews with 40 workers at a large factory to examine the morale among workers in general at that factory, the population is...

all the workers in the factory

A research hypothesis can be sometimes be referred to as an....

alternate hypothesis

As the number of people in a sample gets larger, the distribution of means....

becomes a better approximation of a normal curve

In a principal, a distribution of means can be formed by...

randomly taking a very large number of samples from a population, each of the same size, and making a distribution of their means

If an organizational psychologist conducts extensive interviews with 40 workers at a large factory to examine the morale among workers in general at that factory, the sample is.....

the 40 workers interviewed

The mean of a distribution of means is....

the same as the original population mean

Dividing the variance of the population of individuals by the number of individuals in each sample yields...

the variance of the distribution of means

If a psychologist tests whether there is any difference between how fast people work in the morning versus how fast they work in the evening, the null hypothesis is that....

there is no difference in the speed at which people work

SD2M represents the...

variance of the distribution of means

In a distribution of Z scores, the mean is always.....

zero