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A sample of employees at a large chemical plant was asked to indicate a preference for one of three pension plans. The results are given in the following table. Does it seem that there is a relationship between the pension plan selected and the job classification of the employees? Use the .01 significance level.
Pension Plan
Job Class Plan A Plan B Plan C
Supervisor 10 13 29
Clerical 19 80 19
Labor 81 57 22
A rental agent claims that the mean monthly rent, , for apartments on the east side of town is less than $675 . A random sample of 18 monthly rents for apartments on the east side has a mean of $661, with a standard deviation of $24.
In a certain town, 60% of adults have a college degree. The accompanying table describes the probability distribution for the number of adults
Can researcher conclude that humidity has significant effect on eating behavior? Use a two-tail test with α = .05. Calculate estimated Cohen's d and r2 to measure size of treatment effect.
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline.
A snack food manufacturer selected a sample of 15 bags of pretzels off the assembly line and weighed their contents. If the sample mean is 10.0 and the sample standard deviation is 0.15
The engineer in a widget factory wants to test out a new form of raw materials. So a batch of widgets are made in the old manner as a control group and then a batch are made with the new materials as a comparison.
Karefree State University has an enrollment of 18,000. Researchers took a sample of 900 and found 477 students wanted a Field Hockey team. Construct the 95% and 99% Interval estimates for the population proportion.
Expand the above table to show the change in Ms A's investment portfolio over the year, and construct a suitable diagram to illustrate that information.
Perform the appropriate test for a difference in mean blood glucose and report the p-value for the two-tailed test of significance, assuming that the variances are equal.
Use the Internet or other resources to collect both primary and secondary data regarding the research issue, opportunity, or problem you selected for your Research Process Outline during Week Two.
Describe what is measured by the estimated standard error in the bottom of the independent-measures t statistics.
Explain the differences between qualitative and judgmental statistical time-series, and explanatory/causal forecasting models.
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