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Rainfall on Weekends USA Today and other newspapers reported on a study that sup- posedly showed that it rains more on weekends. The study referred to areas on the East Coast near the ocean. Data Set 11 in Appendix B lists the rainfall amounts in Boston for one year. The 52 rainfall amounts for Wednesday have a mean of 0.0517 in. and a standard deviation of 0.1357 in. The 52 rainfall amounts for Sunday have a mean of 0.0677 in. and a standard deviation of 0.2000 in.
a. Assuming that we want to use the methods of this section to test the claim that Wednesday and Sunday rainfall amounts have the same standard deviation, identify the F test statistic, critical value, and conclusion. Use a 0.05 significance level.
b. Consider the prerequisite of normally distributed populations. Instead of construct- ing histograms or normal quantile plots, simply examine the numbers of days with no rainfall. Are Wednesday rainfall amounts normally distributed? Are Sunday rainfall amounts normally distributed?
c. What can be concluded from the results of parts (a) and (b)?
Mark realizes that queueing theory helps him only so much in determining the number of representatives needed. What inputs do you think need reevaluation? How would you go about estimating these inputs?
Suppose that scores on the Math SAT exam follow a Normal distribution with mean 500 and standard deviation 100. Two students that have taken the exam are selected at random. What is the probability that the sum of their scores exceeds 1200?
1. an art professor was interested in seeing what size group is best to prime the pump so to speak to encourage
Data Analysis and Statistical Modeling for Business
how do i examine correlations of all variables 1 dv amp 5 iv and summarize their relationship? ltbrgti also want to
A formal statement that there is an absence of relationship between variables when tested by a researcher is called what?1.Null hypothesis?
The FBI is studying bribes to Congressmen. A random sample of 49 bribes is selected. The mean bribe in thousands of dollars is $150 and the standard deviation of the sample is $20. Construct a 95 percent confidence interval for the population mean.
A researcher hypothesizes that people who listen to music via ear buds have greater hearing loss than those in the general population. On a standard hearing test, the mean (μ) is 24.75. Higher values indicate better hearing
Two-sample T for side_sideAge_Group N Mean StDev SE Meanelderly 9 22.2 10.3 3.4young 8 15.13 3.91 1.4Difference = mu (elderly) - mu (young)Estimate for difference: 7.1095% CI for difference: (-1.13, 15.32)T-Test of difference = 0 (vs not =): T..
Stat-101, questions from SPSS or Stat-101, Consider the way the table is arranged. If the hypothesis is correct, should we find a positive sign on Somers' dyx or a negative Signon Somers' dyx? Explain how you know.
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