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7 Cards in this Set

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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:
One sample T-test
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.
Z-test
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. The data from this sample are as follows:
One sample T-test
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:
Z-test
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.
One sample T-test
2. A researcher is interested in the effects of pet ownership on health. A sample of elderly dog owners is compared to a similar group (in terms of age and health) who do not own dogs. The researcher records the number of visits to the doctor during the past year for each person. For the following data, is there a significant difference in the number of doctor visits between dog owners and those who do not own dogs?
Independent Groups T-test
3. A researcher examines the short-term effect of a single treatment with acupuncture on cigarette smoking. A random sample of subjects who smoke is randomly assigned to one of two groups. One group receives the treatment with the acupuncture needles. The second group of subjects serves as a comparison group and is given relaxation instruction while on the examining table but they receive no acupuncture treatment. The number of cigarettes smoked the next day is recorded for all subjects. For the following data, determine if there is a significant effect of acupuncture on cigarette consumption.
Independent Groups T-test