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A statistics professor compared the scores of her morning class and afternoon class on the same quiz. The 42 morning students' average score was 83.52 with a standard deviation of 7.81, while the 46 afternoon students' average score was 79.44 with a standard deviation of 6.62. (a) Which test would you use to compare the means? (b) State the hypotheses to see if there was a difference. (c) Obtain a test statistic and p-value. (d) Why might there be a difference between morning and afternoon scores? Explain. (e) Is it reasonable to assume equal variances? (f) Carry out a formal test for equal variances at α = .05, showing all steps clearly.
Compose a 350 to 700-word summary report of your findings to the researcher and owner of the restaurant in which you Identify evidence, if any, of the researcher's claim. Perform a one- or two-tail test on the data provided,
If population standard deviation is σ = 8 is effect large adequate to be statistically significant? Use two - tailed effect with α = .05
Florida State University administers a test of mathematics placement to students when they first enter the university.
Transportation problem using the stepping stone method
Based on chi-square table, what is the most correct statement which can be made about the p-value for the test?
A large department store hired a researcher to compare the average purchase amounts for the downtown store with that of its mall store. The information shown was obtained.
Find a 90% confidence interval for the population mean weight of all such turtles.
An auditor reviewed 25 oral surgery insurance claims from a particular surgical office, determining that the mean out-of-pocket patient billing above the reimbursed amount was $275.66 with a standard deviation of $78.11.
Suppose the federal government proposes to give a substantial tax break to automakers producing midsize cars that get a mean mileage exceeding 31 mpg.
let the number of trials be n = 3, and let the probability of success be p = 0.0228. Use a calculator to compare:
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval and discuss why they are different.
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