The following data presents the productivity scores of 10 workers before and after acertain training program designed to improve productivity. Higher scores indicate better productivity. Do these data provide sufficient evidence that the training program has improved productivity? Perform a hypothesis test at the 5% significance level.
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The following data presents the productivity scores of 10 workers before and after acertain training program designed to improve productivity. Higher scores indicate better productivity.
Do these data provide sufficient evidence that the training program has improved productivity? Perform a hypothesis test at the 5% significance level.
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- Identify the statistical procedures that are appropriate for the data. When possible, identify descriptive statistics, inferential statistics, and a measure of effect size Research suggests that the antioxidants in foods such as blueberries can reduce and even reverse age-related declines in cognitive functioning ( Joseph et al., 1990) to test this phenomenon, a researcher selects a sample of n = 25 adults aged 70 to 75 and administers a cognitive function test to each participant. The participants then drink a blueberry supplement every day for 4 months before they are tested again. The researcher compares the scores before treatment with the scores after treatment to see if there is any change ion cognitive function.Using SPSS, analyze the relationship between respondents’ marital status (MARITAL) and whether they believe it is alright for a couple to live together without intending to get married (COHABOK) using crosstabulation. Which marital status category is most disapproving of nonmarital cohabitation? Which marital status category is most approving of nonmarital cohabitation? Is the relationship between marital status and attitude toward nonmarital cohabitation statistically significant at the .05 level? Compute and interpret an appropriate measure of association for this relationship.Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.
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