Chapter 12 Notes

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T-test for a Population Mean

Conditions

1.)

2.)

3.)

Hypothesis:

Test Statistic:

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Z-test for a Population Proportion (one-proportion z-test)

Conditions:

Hypothesis:

Test Statistic:

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Practice Problems:

A research study was conducted to examine the differences between older and younger adults on perceived life satisfaction. A pilot study was conducted to examine this hypothesis. Ten older adults (over the age of 70) and ten younger adults (between 20 and 30) were give a life satisfaction test (known to have high reliability and validity). Scores on the measure range from 0 to 60 with high scores indicative of high life satisfaction; low scores indicative of low life satisfaction. The data are presented below. Compute the appropriate t-test.

Older AdultsYounger Adults4534382252154827253739415124461955264636

A survey claims that 9 out of 10 doctors recommend aspirin for their patients with headaches. To test this claim, a random sample of 100 doctors is obtained. Of these 100 doctors, 82 indicate that they recommend aspirin. Is this claim accurate? Use alpha = 0.05