A test runs at the 5 percent significance level. If H0 is true, what is the probability of rejecting it? Give your answer as a decimal.

Answer: ______________

A researcher claims the mean fill exceeds 5 ml. Which null hypothesis should the test start from?

• the population mean equals 5
• the population mean exceeds 5
• the sample mean equals 5
• the sample mean exceeds 5

A researcher claims the mean fill exceeds 5 ml. Which null hypothesis should the test start from?

• the population mean equals 5
• the population mean exceeds 5
• the sample mean equals 5

A test runs at the 5 percent significance level. If H0 is true, what is the probability of rejecting it? Give your answer as a decimal.

Answer: ______________

A two-tailed test uses overall level 0.10. How much sits in each tail? Give your answer as a decimal.

Answer: ______________

Bottles are labelled 500 ml and H0 says the mean is 500 ml. In these words, a Type I error is what?

• missing a real change in fill volume
• concluding that the sample mean is 500
• rejecting H0 even though the mean really is 500

A machine is checked against the standard 20 g fill. The question is whether the mean differs from 20 in either direction. Which alternative fits?

• mu > 20
• mu != 20
• mu < 20
• the sample mean != 20

The null hypothesis is the statement the test assumes true until the data argue otherwise. True or false?

Circle one:   True   False

A farmer claims his hens lay heavier eggs than the standard 60 g. Which alternative matches his claim?

• mu > 60
• mu < 60
• mu = 60

A farmer claims his hens lay heavier eggs than the standard 60 g. Which alternative matches his claim?

• mu < 60
• mu != 60
• mu > 60
• mu = 60