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Question: A large manufacturing firm believes that its market share is 45%. From time to time, a statistical hypothesis test is carried out to check whether the assertion is true. The test consists of gathering a random sample of 500 products sold nationally and finding what percentage of the sample constitutes brands made by the firm. Whenever the test is carried out, there is no suspicion as to the direction of a possible change in market share, that is, increase or decrease; the company wants to detect any change at all. The tests are carried out at the α = 0.01 level of significance. What is the probability of being able to statistically determine a true change in the market share of magnitude 5% in either direction? (That is, find the power at p = 0.50 or p = 0.40).
She wants to be 90% confident and be accurate within 5% of the true proportion. Find out the minimum sample size necessary.
Use the Bonferroni or another multiple-comparisons procedure to determine which pairs of means differ significantly. Summarize your results in a short report. Be sure to include a graph.
Assuming that colors are chosen independently of each other for inclusion in new fashions, what is the probability that the designer will be successful with at least one of her colors?
for 30 randomly selected rolling stones concerts the mean gross earnings is 2.9 million dollars. assuming a population
The store used ANOVA to test if the mean sales for each credit card were equal. What are the degrees of freedom for the F statistic?
Reconsider Prob. 19.6-4. The bakery owner, Ken Swanson, now wants you to conduct a financial analysis of various inventory policies. You are to begin with the policy obtained in the first four parts of Prob. 19.6-4 (ignoring any cost for the loss ..
b. When the null hypothesis is how does the formula of part (a) simplify? Use the simplified expression to calculate x2 for the pigeon/direction data in Exercise 4
If, in a separate visit to the restaurant, the journalist is accompanied by three colleagues who also order a hamburger, what is the probability that at least 2 of these 4 customers will receive a hamburger that had a precooked weight greater than..
causality and inferencein may 1998 the new york times carried an article by adam bryant describing a research project
The city of Vancouver Office of Emergency Management reported that 911 operators receive an average of 7.2 calls per hour. Assume that the number of 911 calls follows Poisson distribution
Conclude that is there a difference in the two amounts?
western pennsylvania has an average co2 emission rate of 1538 lbmwh. the city of pittsburgh has 335000 residents. if we
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