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In a sample of 50 business trips taken by employees in the HR department, a company finds that the average amount spent for the trips was $1450 with a standard deviation of $450. In a sample of 80 trips taken by the employees in the sales department is $1650 with a standard deviation of $700. When testing the hypothesis (at the 5% level of significance) that the variance of the amount spent on trips is significantly larger in one department than the other, what is the null and alternative hypotheses? (please write out the null and alternative hypotheses below AND on your scratch work...failure to do BOTH will result in 0 points)
The results of a calculus exam are normally distributed with a mean of 76 and a standard deviation of 6. Find the percentage of students that scored above 70.
The following is based on the normal distribution of scores with mean equal to 90 and standard deviation equal to 3.5. Determine the probability of a score falling between a raw score of 84 and 96?
Define the rejection region. State the statistical decision.
How many participants need to be enrolled in each group to have a 90% chance of detecting a significant difference using a two sided test with α =0.05 if compliance is perfect?
question it would be quite risky for you to insure the life of a 21-year-old friend under the terms of above
Estimate the true mean tensile strength of bars of this size and tyoe using 90% confidence interval. List any assumptions you need to make. Given n=150, x(bar)=477N/mm^2, and s=13.
A recent article suggested that if you earn $25,000 a year today and the inflation rate continues at 3 percent per year, you'll need to make $33,598 in 10 years to have the same buying power. You would need to make $44,771 if the inflation rate ju..
Construct a 95% confidence interval for the population mean service charge if a customer's account falls below the $1,500 minimum.
What is the probability that this teammate has two or fewer years of experience? more than five years of experience? What is the probability that, considering both of Dave's two teammates.
let a b and c be independent random variables uniformly distributed over 05 03 and 04 respectively. what is the
a missile designed to destroy enemy satellites has a 0.80 chance of destroying its target. if the government tests
Summarize what the case is about, and what the variables represent. How would you apply confidence intervals? How would you apply hypothesis testing
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