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Eric has computed that it takes an average (mean) of 17 minutes with a standard deviation of 3 minutes to drive from home, park the car, and walk to his job. One day it took Eric 21 minutes to get to work. You would use the formula for transforming a raw score in a sample into a z-score to determine how many standard deviations the raw score represents. Since his "score" is 21, you would subtract the mean of 17 from 21 and divide that result (4) by the standard deviation of 3. The z-score of 1.33 tells you that Eric's time to get to work is 1.33 standard deviations from the mean.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
Be certain to mention the direction of the relationship, the strength of the relationship, and whether our findings are statistically significant
Looking at the data, the manufacturer is incorrect in its label claim. Perform hypothesis testing to prove or disprove it. Is the manufacturer correct in its label claim? Explain.
The sample size n , the sample means, and the sample standard deviations for the two groups are given below.
Determine the probability distribution associated with these data.
Use the marginal probabilities of school quality, school cost or convenience, and other to comment on the most important reason for choosing a school.
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
Categorize the following as discrete or continuous random variables.
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
Show the graph of the probability density function for flight time.
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
We want to test the hypothesis that population B has a smaller variance than population A.
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