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Chapter 9: Q.60 (page 540)

Assume the null hypothesis states that the mean is at most 12. Is this a left-tailed, right-tailed, or two-tailed test?

Short Answer

Expert verified

A right-tailed test is used here if the null hypothesis states that the mean is at most12.

Step by step solution

01

Introduction

The greater than (>) symbol in your hypothesis statement indicates a right tailed test. To put it another way, the inequality is pointing to the right.

02

Explanation

A right-tailed test is the best fit here as Hastates that the mean is at most 12and not larger. Also. the alternative hypothesis sign is " > " which tells us that a right-tailed test is a correct option here. A right-tailed test will have a '>' sign in Ha.

Therefore,H0:p鈮�12Ha:p>12

A figure depicting a right-tailed test.

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Most popular questions from this chapter

Suppose the null hypothesis, H0, is: a patient is not sick. Which type of error has the greater consequence, Type Ior TypeII?

A recent survey in the N.Y. Times Almanac indicated that 48.8% of families own stock. A broker wanted to determine if this survey could be valid. He surveyed a random sample of 250 families and found that 142 owned some type of stock. At the 0.05 significance level, can the survey be considered to be accurate?

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La Leche League International reports that the mean age of weaning a child from breastfeeding is age four to five worldwide. In America, most nursing mothers wean their children much earlier. Suppose a random survey is conducted of21 U.S. mothers who recently weaned their children. The mean weaning age was nine monthsrole="math" localid="1649394170256" (3/4year) with a standard deviation of 4 months. Conduct a hypothesis test to determine if the mean weaning age in the U.S. is less than four years old.

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d. Reject H0: There is sufficient evidence to conclude that less than 30% of teen girls smoke to stay thin.
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