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A CNN/USA Today poll conducted by Gallup asked a sample of employed Americans the following question: "Which do you enjoy more, the hours when you are on your job, or the hours when you are not on your job?" The responses to this question were cross-tabulated against several characteristics among which were gender, age, type of community, educational attainment, income, and type of employer. The data are provided on the WeissStats site. In each of Exercise \(12.87-12.92\), use the technology of your choice to decide at the \(5%\) significance level, whether an association exists between the specified pair of variables.

age and response

Short Answer

Expert verified

The data provide is sufficient evidence to conclude that an association exist between age and response.

Step by step solution

01

Step 1. Given information

The level of significance \(\alpha =0.05\)

02

Step 2. Calculation

Consider the below test hypothesis.

Null hypothesis:

\(H_{0}\): There is no association exist between age and response..

Alternative hypothesis:

\(H_{a}\): There is association exist between age and response.

By using any software perform the chi-square homogeneity test to find the test statistic.

Enter the given data,

Then we get, the chi-square static as \(=41.430, p-value=0.00\)

Then, we have the

The rejection rule:

\(p-value \leq \alpha\), then null hypothesis rejected.

The level of significance \(\alpha =0.05\)

Here , clearly \(p-\)value is less than the level of significance.

\(p-value (0.00)<\alpha (0.05)\)

So, the null hypothesis is rejected at \(5%\) significant level.

Thus the results are statistically significant at \(5%\) significant level.

Hence,

The data provide is sufficient evidence to conclude that an association exist between age and response.

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Most popular questions from this chapter

US. Hospitals. Refer to Exercise 12.50.


24 or fewer25-7475 or moreTotal
General260158635575403
Psychiatric24242471737
Chronic132226
Tuberculosis0224
Other25177208410
Total310201042606580

a. Determine the conditional distribution of number of beds within each facility type.

b. Does an association exist between facility type and number of beds for U.S. hospitals? Explain your answer.

c. Determine the marginal distribution of number of beds for U.S. hospitals.

d. Construct a segmented bar graph for the conditional distributions and marginal distribution of number of beds. Interpret the graph in light of your answer to part (b),

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f. Determine the marginal distribution of facility type and the conditional distributions of facility type within number-of-beds categories.

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i. What percentage of general facilities have at least 75 beds?

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The chi-square goodness-of-fit test provides a method for performing a hypothesis test about the distribution of a variable that has c possible values. If the number of possible values is 2, that is, c=2, the chi-square goodness-of-fit test is equivalent to a procedure that you studied earlier.

a) Which procedure is that? Explain your answer.

b) Suppose that you want to perform a hypothesis test to decide whether the proportion of a population that has a specified attribute is different from p_0. Discuss the method for performing such a test if you use (1) the one-proportion z-test (page 463) or (2) the chi-square goodness-of-fit test.

We have presented a contingency table that gives a cross-classification of a random sample of values for two variables x and y, of a population.

Perform the following tasks

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Although the chi-square homogeneity test and the chi-square independence test use essentially the same basic procedure, the context of the two tests are quite different. Explain the difference.

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