Devry Math 221 Week 7 Homework - Latest

DeVry MATH 221 Week 7 Homework - Latest

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1. DeVry MATH 221 Week 7 Homework - Latest 2015

2.

3.

4. Use the given statement to represent a claim. Write it’s complement and state which is Ho and which is Ha.

u> 635

Find the complement of the claim.

u < 635

2. A null and alternative hypothesis are given. Determine whether the hypothesis test is left-tailed, right tailed, or two-tailed.

What type of test is being conducted in this problem?

Answer: Right-tailed test

3. Write the null and alternative hypotheses. Identify which is the claim.

A light bulb manufacturer claims that the mean life of a certain type of light bulb is more than 700 hours.

Identify which is the claim.

Answer: The alternative hypothesis Ha is the claim.

4. Write the null and alternative hypotheses. Identify which is the claim. The standard deviation of the base price of a certain type of car is at least $1010.

Identify which is the claim.

Answer: The null hypothesis Ho is the claim.

5. More than 11% of all homeowners have a home security alarm. Determine whether the hypothesis for this claim is left-tailed, right-tailed, or two-tailed. Explain your reasoning.

Answer: The hypothesis test is right-tailed because the alternative hypothesis contains >

6. A film developer claims that the mean number of pictures developed for a camera with 22 exposures is less than 17. If a hypothesis test is performed, how should interpret a decision that (a) rejects the null hypothesis and (B) fails to reject the null hypothesis?

A = There is enough evidence to support the claim that the mean number of pictures developed for a camera with 22 exposures is less than 17.

B = There is not enough evidence to support the claim that the mean number of pictures developed for a...