One Sample Z Test

If the obtained value is NOT higher than the critical value, we ______.

• reject the null hypothesis

• fail to reject the null hypothesis

• accept all hypotheses

• reject all hypotheses

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?

• −5

• 5

• 0

• 50

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?

• 0

• −.1

• 1

• −1

If your population average is 45, your sample mean is 50, and your standard error of the mean is 5, what is your observed z value?

• 0

• −.1

• 1

• −1

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

• −5

• 14

• 6

• 5

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

• −10

• 10

• 5

• −5

If you have a sample size of 16 and a population standard deviation of 40, what is your standard error of the mean?

• −10

• 10

• 5

• −5

In z = 2.56, p < .05, what is the probability?

• p < .05

• 2.56

• z = 2.56

• There is no probability here.

If you have a population standard deviation of 18 and a sample size of 9, what is your standard error of the mean?

• −3

• 11

• 6

• 5

If you have a sample size of 4 and a population standard deviation of 12, what is your standard error of the mean?

• −3

• 11

• 6

• 5