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Chapter 9: Q.8 (page 546)

A change is made that should improve student satisfaction with the parking situation at your school. Right now, 37% of students approve of the parking that鈥檚 provided. The null hypothesis H0:p^=0.37is tested against the alternativeHd:p^鈮�0.37.

Short Answer

Expert verified

The population value = 0.37as per null hypothesis and is not equal to0.37as per alternative hypothesis, the problem is incorrect.

Step by step solution

01

introduction

Given,

A change is made that should improve student satisfaction with the parking situation at your school

The students approve of the parking that鈥檚 provided is 37%

02

explanation

Calculating the hypotheses,

The population value is0.37as per the null hypothesis

鈬�H0:p=0.37

The population value is not equal to 0.37as per alternative hypothesis

鈬�Ha:p鈮�0.37

The population value = 0.37 as per null hypothesis and is not equal to0.37 as per alternative hypothesis, the problem is incorrect.

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Most popular questions from this chapter

Are TV commercials louder than their surrounding programs? To find out, researchers collected data on 50randomly selected commercials in a given week. With the television鈥檚 volume at a fixed setting, they measured the maximum loudness of each commercial and the maximum loudness in the first 30seconds of regular programming that followed. Assuming conditions for inference are met, the most appropriate method for answering the question of interest is

(a) a one-proportion z test.

(b) a one-proportion z interval.

(c) a paired t test.

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(a) State hypotheses for a significance test to determine whether the average response time has decreased. Be sure to define the parameter of interest.

(b) Describe a Type I error and a Type II error in this setting, and explain the consequences of each.

(c) Which is more serious in this setting: a Type I error or a Type II error? Justify your answer.

We want to be rich In a recent year, 73 % of first-year college students responding to a national survey identified "being very well-off financially" as an important personal goal. A state university finds that 132 of an SRS of 200 of its first-year students say that this goal is important. Is there good evidence that the proportion of all first-year students at this university who think being very well-off is important differs from the national value, 73 %? Carry out a test at the 伪=0.05 significance level to help answer this question.

Hemoglobin is a protein in red blood cells that carries oxygen from the lungs to body tissues. People with fewer than 12 grams of hemoglobin per deciliter of blood (g/dl) are anemic. A public health official in Jordan suspects that Jordanian children are at risk of anemia. He measures a random sample of 50 children. Check the conditions for carrying out a significance test of the official鈥檚 suspicion.

The z statistic for a test of H0 :p = 0.4 versus Ha : p > 0.4 is z = 2.43. This test is

(a) not significant at either 伪=0.05or 伪=0.01.

(b) significant at 伪=0.05but not at 伪=0.01

(c) significant at 伪=0.01but not at 伪=0.05.

(d) significant at both 伪=0.05and 伪=0.01.

(e) inconclusive because we don鈥檛 know the value of 藛p .
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