AP Stat

A manufacturer claims that his tires last at least 40,000

miles. A test on 25 tires reveals that the mean life of a tire

is 39,750 miles, with a standard deviation of 387 miles.

Test the Manufacturer’s claim at α = .01.

• There is enough evidence to reject the claim

• There is not enough evidence to reject the claim

• There is enough evidence to support the claim

• There is not enough evidence to support the claim

Environmental advocates believe that there is too much Mercury in a town's lake. To test their claim, they took 7 samples of water from the lake and measured the concentration of mercury, in milligrams per cubic meter, in each sample. Assume the population distribution is normal. The sample results were: 1.02, 1.23, 0.91, 1.29, 1.01, 1.35, 1.43 Perform a hypothesis test to determine if the mean concentration of mercury is greater than 1 milligram per cubic meter. Use a 0.05 level of significance. Choose the correct null and alternate hypothesis statements.

Environmental advocates believe that there is too much Mercury in a town's lake. To test their claim, they took 7 samples of water from the lake and measured the concentration of mercury, in milligrams per cubic meter, in each sample. Assume the population distribution is normal. The sample results were:
1.02, 1.23, 0.91, 1.29, 1.01, 1.35, 1.43
Perform a hypothesis test to determine if the mean concentration of mercury is greater than 1 milligram per cubic meter. Use a 0.05 level of significance.
What type of test should you run?

• Z test

• T test

• 1-Prop Z test

• X² test

Environmental advocates believe that there is too much Mercury in a town's lake. To test their claim, they took 7 samples of water from the lake and measured the concentration of mercury, in milligrams per cubic meter, in each sample. Assume the population distribution is normal. The sample results were: 1.02, 1.23, 0.91, 1.29, 1.01, 1.35, 1.43 Perform a hypothesis test to determine if the mean concentration of mercury is greater than 1 milligram per cubic meter. Use a 0.05 level of significance. Choose the correct conclusion statement

• There is not enough evidence to conclude that the mean concentration of mercury in the town lake is greater than 1 milligram.

• There is not enough evidence to conclude that the mean concentration of mercury in the town lake is less than 1 milligram.

• There is enough evidence to conclude that the mean concentration of mercury in the town lake is less than 1 milligram.

• There is enough evidence to conclude that the mean concentration of mercury in the town lake is greater than 1 milligram.

Identify the notation

• Mean of sample

• Mean of population

• standard deviation of sample

• variance of sample

Identify the notation

• mean of population

• standard deviation of the sample

• standard deviation of population

• sample size

Identify the notation

• Sample size

• Mean of sample

• Standard deviation of the sameple

• Variance of population

Identify the notation

• Expected value of X

• standard deviation of the sample

• standard deviation of population

• Example X

Identify the notation

• Expected value of X

• standard deviation of the sample

• n choose x

• n given X

Identify the notation

• Expected value of X

• standard deviation of the sample

• n choose x

• n given X