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Chapter 9: Q. 9.44 (page 364)

In each of Exercises 9.41-9.46 ,determine the critical values for a one-mean z-test. For each exercise, draw a graph that illustrates your answer

A left-tailed test with伪=0.05

Short Answer

Expert verified

A left-tailed test with 伪=0.05.

In the left tail test that 伪=0.05, from normal local tables values are significant
z0=-1.645.

Step by step solution

01

Step 1. Given 

A left-tailed test with伪=0.05

02

Step 2. Graph 

A left-tailed test with 伪=0.05.

in the left tail test that 伪=0.05, from normal local tables values are significant z0=-1.645.

The graph is shown below :

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Most popular questions from this chapter

The normal probability curve and stem-to-leaf diagram of the data are shown in figure; 蟽is unknown.

Perform Hypothesis test for mean of the population from which data is obtained and decide whether to use z-test, t-test or neither. Explain your answer.

Determine the critical value(s) for a one-mean z-test at the 1 % significance level if the test is

a. right tailed.

b. left tailed.

c. two tailed.

The Federal Bureau of Investigation (FBI) compiles information on robbery and property crimes by type and selected characteristic and publishes its finding in Uniform Crime Reports. According to that document, the mean value lost to purse snatching was \(468 in 2012.For last year, 12 randomly selected purse-snatching offenses yielded the following values lost, to the nearest dollar.

Use a t-test tp decide, at the 5%significance level, whether last year's mean value lost to purse snatching has decreased from 2012 mean. The mean and standard deviation of the data are \)455 and $86.80 respectively.

Beef Consumption. According to Food Consumption, Prices,\and Expenditures, published by the U.S. Department of Agriculture. the mean consumption of beef per person in 2011 was 57.5 lb. A sample of 40 people taken this year yielded the data, in pounds, on last year's beef consumption given on the Weiss Stats site. Use the technology of your choice to do the following.

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d. Assuming that the four potential outliers are not recording errors, comment on the advisability of removing them from the sample data before performing the hypothesis test.

e. What action would you take regarding this hypothesis test?

The normal probability curve and histogram of the data are shown in figure; 蟽is unknown.

Perform Hypothesis test for mean of the population from which data is obtained and decide whether to use z-test, t-test or neither. Explain your answer.
See all solutions

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