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A significance test allows you to reject a null hypothesis H0H0in favor of an alternative hypothesisHaaat the 5%significance level. What can you say about significance at the1%level?

a.H0H0can be rejected at the1%significance level.

b. There is insufficient evidence to rejectH0H0at the1%significance level.

c. There is sufficient evidence to accept H0H0at the 1%significance level.

d.HaHacan be rejected at the 1%significance level.

e. The answer can't be determined from the information given.

Short Answer

Expert verified

The answer can't be determined from the information given.

Step by step solution

01

Step 1:Given information

A significance test allows you to reject a null hypothesis H0H0in favor of an alternative hypothesis HaHaat the5% significance level.

02

Step 2:Explaination

Reject the null hypothesis }H0if and only if and given that the P-value is smaller than the significance level.

At the 5 percent significance level the null hypothesis was rejected:

P<0.05=5%

Do not know if the p-valuePis less than1%or not

Hence, the correct option is (e)

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Most popular questions from this chapter

Flu vaccine A drug company has developed a new vaccine for preventing the flu. The company claims that fewer than 5% of adults who use its vaccine will get the flu. To test the claim, researchers give the vaccine to a random sample of 1000 adults.

a. State appropriate hypotheses for testing the companyโ€™s claim. Be sure to define your parameter.

b. Describe a Type I error and a Type II error in this setting, and give the consequences Page Number: 615 of each.

c. Would you recommend a significance level of 0.01, 0.05, or 0.10 for this test? Justify your choice.

d. The power of the test to detect the fact that only 3% of adults who use this vaccine would develop flu using ฮฑ=0.05 is 0.9437. Interpret this value.

e. Explain two ways that you could increase the power of the test from part (d).

Potato power problems Refer to Exercises 85 and 87

a. Explain one disadvantage of using ฮฑ=0.10 instead of ฮฑ=0.05 when

performing the test.

b. Explain one disadvantage of taking a random sample of 500 potatoes instead of 250 potatoes from the shipment.

More lefties?In the population of people in the United States, about 10% are left-handed. After bumping elbows at lunch with several left-handed students, Simon wondered if more than 10%of students at his school are left-handed. To investigate, he selected an SRS of 50students and found 8lefties (pโœ=8/50=0.16).

To determine if these data provide convincing evidence that more than 10%of the students at Simonโ€™s school are left-handed, 200trials of a simulation were conducted. Each dot in the graph shows the proportion of students that are left-handed in a random sample of 50students, assuming that each student has a 10%chance of being left handed.

a. State appropriate hypotheses for performing a significance test. Be sure to define the parameter of interest.

b. Use the simulation results to estimate the P-value of the test in part (a). Interpret the P-value.

c. What conclusion would you make?

Making conclusions A student performs a test of H0:ฮผ=12versus Ha:ฮผโ‰ 12

at the ฮฑ=0.05significance level and gets a P-value of 0.01. The

student writes: โ€œBecause the P-value is small, we reject H0. The data prove that Hais true.โ€ Explain what is wrong with this conclusion.

Do you Tweet? The Pew Internet and American Life Project asked a random sample of U.S. adults, โ€œDo you ever โ€ฆ use Twitter or another service to share updates about yourself or to see updates about others?โ€ According to Pew, the resulting 95% confidence interval is (0.123, 0.177).11 Based on the confidence interval, is there convincing evidence that the true proportion of U.S. adults who would say they use Twitter or another service to share updates differs from 0.17? Explain your reasoning.

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