Stats Mid year test Review 2

To test a claim about a mean, when the population standard deviation is known we use:

• z statistic

• f statistic

• t statistic

• chi-square statistic

The null hypothesis is represented by:

• Ha

• Ho

• t*

• HP

• μ

The null hypothesis always contains a(an):

• < or >

• =

• >

• = or >

• ≠

Find the critical value and rejection region for the type of z-test with level of significance α.

two-tailed; a = 0.05

Compute the value of the standardized test statistic (z-statistic). Round your answer to two decimal places.

You wish to test the claim that μ = 25 at a level of significance

of α=0.02 and are given sample statistics

n =45, sample mean = 26.1. Assume the population standard deviation is 4.21.

• z = 1.76

• z = -1.75

• z = 1.75

• z = -1.76

• one-sample t test for means

• one-sample z test for proportion 

Campbell's claims that the sodium content in one serving of soup is no more than 50 mg. There is concern the sodium is higher. Which of the following would be an appropriate description of the hypothesis test for this claim?

• Left-tailed

• Right-tailed

• Two-tailed

• None of these

• -3.143

• -2.998

• 2.998

• 3.143

check all that apply

• This is a left tail test

• This is a right tail test

• This has a level of significance of 0.975

How do you calculate the standard deviation?

• Divide the variance by 2.

• Its a long process and I can't explain it right now.

• Find the mean and multiply it by the variance.

• Take the square root of the variance.