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Chapter 11: Q 3. (page 716)
P-values For each of the following, find the value using Table Then
calculate a more precise value using technology.
a.
b.
Part (a) value
Part (b) value
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No chi-square A school鈥檚 principal wants to know if students spend about the same amount of time on homework each night of the week. She asks a random sample of 50 students to keep track of their homework time for a week. The following table displays the average amount of time (in minutes) students reported per night.
Explain carefully why it would not be appropriate to perform a chi-square test for goodness of fit using these data.
Last python Refer to Exercises 28 and 30.
a. Verify that the conditions for inference are met.
b. Use Table C to find the P-value. Then use your calculator鈥檚 蠂2 cdf command.
c. Interpret the P-value from the calculator.
d. What conclusion would you draw using 伪=0.10?
All current-carrying wires produce electromagnetic (EM) radiation, including the electrical wiring running into, through, and out of our homes. High-frequency EM radiation is thought to be a cause of cancer. The lower frequencies associated with household current are generally assumed to be harmless. To investigate the relationship between current configuration and type of cancer, researchers visited the addresses of a random sample of children who had died of some form of cancer (leukemia, lymphoma, or some other type) and classified the wiring configuration outside the dwelling as either a high-current configuration (HCC) or a low-current configuration (LCC). Here are the data:
Computer software was used to analyze the data. The output included the value
Which of the following is the expected count of cases with lymphoma in homes with an HCC?
a.
b.
c.
d.
e. None of these
When analyzing survey results from a two-way table, the main distinction between a test for independence and a test for homogeneity is
a. how the degrees of freedom are calculated.
b. how the expected counts are calculated.
c. the number of samples obtained.
d. the number of rows in the two-way table.
e. the number of columns in the two-way table.
Birds in the trees Researchers studied the behavior of birds that were searching for seeds and insects in an Oregon forest. In this forest, of the trees are Douglas firs, are ponderosa pines, and are other types of trees. At a randomly selected time during the day, the researchers observed red-breasted nuthatches: were seen in Douglas firs, in ponderosa pines, and in other types of trees.
a. Do these data provide convincing evidence that nuthatches prefer particular types of trees when they鈥檙e searching for seeds and insects?
b. Relative to the proportion of each tree type in the forest, which type of trees do the nuthatches seem to prefer the most? The least?
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