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STATS Learn 7 IA Problems and STATS Learn 8 IA Problems Solution




Question. A recent study compared the time spend together by single- and dual-earner couples. According tothe records kept by the wives during the study, the mean amount of time spent together watchingtelevision among the single-earner couples was 61 minutes per day, with a standard deviation of15.5 minutes. For the dual-earner couples, the mean number of minutes spent watching televisionwas 48.4 minutes, with a standard deviation of 18.1 minutes. At the.01 significance level, can youconclude that the single-earner couples on average spend more time watching televisiontogether? There were 15 single-earner and 12 dual-earner couples studied.2. The null and alternate hypotheses are:A random sample of 20 items from the first population showed a mean of 100 and a standarddeviation of 15. A sample of 16 items for the second population showed a mean of 94 and astandard deviation of 8. Use the.05 significant level.3. The following hypotheses are given.A random sample of five observations from the first population resulted in a standard deviation of12. A random sample of seven observations from the second population showed a standarddeviation of 7. At the.01 significance level, is there more variation the first population?.1 the following sample observation were randomly selecteddetermine the corellation coffecient2.3. A sociologist claims that the success of students in college (measured by their GPA) is related to their family?s income. For a sample of 20 students, the correlation coefficient is 0.40. Using the 0.01 significance level, can we conclude that there is a positive correlation between the variables?4.5.6. In a multiple regression equation, k=5 and n=20, the MSE value is 5. 10, and SS total is 519.68. At the.05 significance level, can we conclude that any of the regression coefficients are not equal to 0?4.


Paper#61808 | Written in 18-Jul-2015

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