Determining difference in variances

Reference no: EM13110299

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 $2.78. 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 $2.05. The means appear to be very close, but not the variances. At alpha = .05, is there a difference in variances? Show all steps clearly. (Data are from a project by statistics students Kim Dyer, Amy Pease, and Lyndsey Smith.)

Please post their outputs support your calculations.

Hypotheses

Value of the test statistic

p-value

Decision rule with the p-value

Decision

Conclusion

Reference no: EM13110299

Questions Cloud

What do you suppose would happen to your muscles : Curare, a poison extracted from a South American shrub, blocks the binding of Ach by muscle cells. What do you suppose would happen to your muscles, including the ones involved in breathing, if a toxic dose of curare entered your bloodstream?

Find range of probability by graphical sensitivity analysis : Use graphical sensitivity analysis to find out range of probabilities of state of nature S1 for which each of decision alternatives has largest expected value.

Discuss purpose of strategic objectives : What are strategic objectives? What is the purpose of strategic objectives? What makes an effective strategic objective?

Explain why rigor mortis develops : For about the first 36 hours after a person dies, their skeletal muscles are in a rigid state called rigor mortis because myosin cross-bridges cannot detach from actin. Given what you have learned about muscle contraction physiology, can you expla..

Determining difference in variances : 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 $2.78.

Describe the key planning factors for competitive success : What are the key planning factors for competitive success? Provide an example of an organization that has achieved competitive success through planning.

Mean number of calories in popcorn : In an article appearing in Today's Health a writer states that the average number of calories in a serving of popcorn is 75. To determine if the average number of calories in a serving of popcorn is different from 75

Determine maximum and minimum dollar amount : Determine the maximum and minimum dollar amount spent per week for middle 50% of one-person households. Suppose that standard deviation is$5 and variable is normally distributed.

Explain what part of the brain stimulates breathing : What triggers your body to take a breath? Surprisingly, blood oxygen levels are not the most influential factor. Explain what part of the brain stimulates breathing and what aspects of body chemistry are important in controlling the rate and depth..

User Account

All Pages