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Within the school district, students were arbitarily assigned to one of two Math teachers - Mrs. Smith and Mrs. Jones. After assignment, Mrs. Smith had 30 students, and Mrs. Jones had 25 students. At end of year, each class took same standardized test. Mrs. Smith's students had average test score of 78, with standard deviation of 10; and Mrs. Jones' students had average test score of 85, with standard deviation of 15. Test hypothesis that Mrs. Smith and Mrs. Jones are equally effective teachers. Use 0.10 level of significance. (Suppose that student performance is approximately normal.)
If you select a random sample of 16 cups and are willing to have an α = 0.05 risk of committing a Type I error, compute the probability of a Type II error (β) if the population mean amount dispensed is actually:
The researcher also gathers data on age and major to see if there is any connection between these varibales and frequency of sexual harassment.
If the manufacturer's claim is true, what is the probability that the claim will be rejected?
Determine the probability that mean annual snowfall during 40 randomly picked years will exceed 111.8 inches?
Establish a 99% Confidence interval about the difference in the proportion of the town voters and county voters who favor the proposal.
As reported by Runner's World magazine, the times of the finishers in the New York City 10-km run are normally distributed with a mean of 61 minutes and a standard deviation of 9 minutes. Let x be the finishing time for a finisher in the New York ..
A correlation coefficient computed for n=18 and a=0.10 is r=0.692. . Using the t -test for the correlation coefficient, what are the critical values?
a random sample of 100 doctors was selected. Suppose you reject the null hypothesis. What conclusion can you draw?
How do you classify statistical findings in order of power: nominal, ordinal, interval, and ratio? Give example by making up values.
Florida consumers are confident about the economy. verify the 90% confidence interval. State in a sentence the meaning of the derived confidence interval .494, .568. What would be your conclusion?
This requires you evaluate the data (on the next sheet) and apply Queueing Theory to determine the characteristics of the queues. Please refer to the concept on Queuing Theory for the procedures to do.
What is the purpose of a Wilcoxon signed-rank test? Explain. The Wilcoxon signed-rank test resembles which parametric test(s)? Explain.
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