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5 Cards in this Set
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2) In 1975 a nationwide survey revealed that U.S. grade school children spent an average of = 4.5 hours per week doing homework. The distribution of homework times was normal with = 2.3. In 2000 a sample of n = 100 students was given the same survey. For this sample, the average number of homework hours was 5.2.
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Z-Test
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3) A researcher is trying to assess some of the physical changes that occur in addicts during drug withdrawal. For the population, suppose the average body temperature is = 98.6 degrees with = .70. The following data consist of the body temperatures of a sample of heroin addicts during drug withdrawal:
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Z-Test
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1. The Girl Scout council has set a goal for each girl to sell an average of 100 boxes of Girl Scout cookies. To see if the girls are meeting the goal, the council randomly selected 15 girls and recorded how many cookies they sold. Their data is presented below.
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One Sample T-test
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2. A researcher would like to examine the effect of labor unions on the average pay of workers. The investigator obtains information from the National Carpenters Union, which states that the average pay for union carpenters is = $11.50 per hour. The researcher then obtains a random sample of ten carpenters who do not belong to a union and records the pay for each.
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One Sample T-test
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3. A researcher hypothesizes that a new drug will improve one's memory. A sample of college students was given the drug every day for two months. They were then tested using the Peterson-Johnson test of memory. The average score on this test is normally an 8.0 (higher scores indicate better memory). The data from our sample are as follows:
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One Sample T-test
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