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A sample of 25 concession stand purchases at the October 22 matinee of Bride of Chucky showed a mean purchase of $5.29 with a standard deviation of $3.02. For the October 26 evening showing of the same movie, for a sample of 25 purchases the mean was $5.12 with a standard deviation of $2.14. The means appear to be very close, but not the variances. (a) At α = .05, is there a difference in variances? (b) Show all steps clearly, including an illustration of the decision rule.
Explain the difference between multiple independent variables and multiple levels of independent variables. Which is better?
Scores range from 0 to 200. The mean score for students who live on the west coast is about 115. Construct a 90% confidence interval for the unknown mean of the students on the east coast.
The president of a certain university makes three times as much money as one of the department heads. If the total of their salaries is$ 200.000, find each worker's salary
What is the importance of the null hypothesis? Why has it been the backbone of mainstream hypothesis testing for decades? What are its limitations?
If a mosquito lands, it will bite you with probability 0.4, and it will never bother you with probability 0.6, independently of other mosquitoes. What is the expected time between successive bites?
Yyielding a $20,000 profit, and a 30% chance that the building will sell for $230,000, yielding a $70,000 profit. What is the expected profit? = E( X - ) = ( xi - What is Var(X)?
What is the minimum score needed to be in the top 25% on this test? Carry your intermediate computations to at least four decimal places.
The uniform distribution over the interval 7.5 to 10.5 gallons per minute. Find the probability that between 8.0 gallons and 9.0 gallons are pumped during a randomly selected minute.
Independently of all the others. The system is operational if no two adjacent lamps fail. Obtain an expression for system reliability.
Random sample of round-trip discount fares on this route last month gives: At .01 significance level can we conclude that mean fare has increased? Determine the p-value?
11% of all books sold are romance genre. If the bookstore sells 316 books on a given day, what is the probability that fewer than 40 are romances, at least 25 are romances, between 25 and 40 are romances?
An Auditor of a small bsuiness has sampled 50 of 700 accounts. The sample mean total receivables is $435, and the sample standard deviation is $86. Find a 95% confidence interval for the total amount of receivables.
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