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You are told that the population of the scores of IQ test takers is normally distributed, has a population mean of 100 and a standard deviation of 10. You get a sample of 100 takers and find out that the mean score of those takers is 101.9.
a) At a 0.10 significance level, do you have enough evidence, based on the sample, to conclude that this mean score may have changed?
b) At a 0.05 significance level, do you have enough evidence, based on the sample, to conclude that this mean score may have changed?
c) At a 0.01 significance level, do you have enough evidence, based on the sample, to conclude that this mean score may have changed?
d) What is the maximum level of significance required that would make you conclude that the mean score has changed?
in usa today sept. 5 1996 the results of a survey involving the use of sleepwear while traveling were listed as
Perform an appropriate hypothesis test, showing all critical steps. Do you support Bob's claim that citizens in his area spend more than $75 per year? Explain why or why not.
At the 0.01 significance level is it reasonable to conclude that the modifaction reduced the number of traffic accidents?
An analysis decides to remove records that have missing values-About how many records would you expect would be removed
Garbage quantity is approximately normally distributed. Find the probability that the mean from a sample of 30 families will have between 17 and 18 pounds of garbage.
What is an appropriate null hypothesis to compare the quality of the product manufactured in the overseas plants and the U.S. plants? Why?
Assume rivets are defective independently of one another, each with the same probability. If 24% of all seams need reworking, determine the probability that rivet is defective?
Write a short report dicussing the claim that average diastolic blood pressure in 1958 (variable dbp58) is the same for men who were alive in 1968 and for men who were not.
A sample of 25 MBA students taking OTM course in the Spring of 2013 shows an average income of $85,000 with the sample standard deviation of $5,000. Find the 95% confidence interval of the population mean income of MBA students.
The average weight of adult men is 172 pounds with a standard deviation of 29 pounds. 30 men were asked their weight and the mean was calculated to be 181, test the hypothesis that the mean is not 172 pounds using alpha = .05.
A sample of n observations is taken from a population. When performing statistical inference about a population variance, the appropriate chi-square distribution has:
For testing the null hypothesis at the 4% level of significance that mu GE 100 vs the alternative that mu
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