# STATS CH 10

If you have a population standard deviation of 20 and a sample size of 4, what is your standard error of the mean?

10

In a one-sample Z test, this number of groups is being compared:

1

If the obtained value is higher than the critical value, we ______________________.

Reject the null hypothesis

The standard error of the mean is the best estimate that we can come up with given that it is impossible to compute _______________________.

All possible means

After conducting a one-sample Z test, you arrived at a value of 5.7 for the z value. What is your conclusion?

Reject the null hypothesis

This is the error term used as the denominator in the equation for the z value in a one-sample Z test.

Standard error of the mean

If the obtained value is not higher than the critical value, we _____________________.

Accept the null hypothesis
..

The numerator of the equation for the z value is:

The population average subtracted from the mean of the sample.

The standard error of the mean is calculated as:

The population standard deviation divided by the square root of the size of the sample.

If your sample mean is 20, your population average is 10, and your standard error of the mean is 2, what is your observed z value?
c.
5

...

If you have a population standard deviation of 10 and a sample size of 4, what is your standard error of the mean?
d.
5

...

If your sample mean is 100, your population average is 90, and your standard error of the mean is 10, what is your observed z value?
d.
1

...

In "z = 2.56, p<.05", what is the obtained value?
d.
2.56

...

If your sample mean is 25, your population average is 5, and your standard error of the mean is 10, what is your observed z value?
d.
2

...

After conducting a one-sample Z test, you arrived at a value of -12.5 for the z value. What is your conclusion?
b.
Reject the null hypothesis

...

The denominator in the equation for the z value is equal to:
a.
The standard error of the mean.

...

The level of risk associated with the null hypothesis is generally set at:
a.
.05

...

The one-sample Z test is used to compare the ____________ to _____________.