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The publisher of Celebrity Living claims that the mean sales for personality magazines that feature people such as Angelina Jolie or Paris Hilton are 1.5 million copies per week. A sample of 10 comparable titles shows a mean weekly sales last week of 1.3 million copies with a standard deviation of 0.9 million million copies. Does this data contradict the publisher's claim? Use a 0.01 significance level. Show all work.
The trial failed to show significance. How many subjects would be required to detect the difference in proportions observed in the trial with 80% power?
The appropriate use of multiple regression depends on being able to make four basic assumptions about the data being used to develop the regression model:
Given CAPM as the benchmark, is either of the two managers over-performing the market? What if you use the Sharpe Ratio as benchmark? Explain the answer carefully.
Find a 95% confidence interval for the true proportion of voters who approve of the way the government is being run.
What is the percent difference between the two amounts relative to the amount for mathematics majors (round to the nearest percent)?
How does a t test differ from a z test in terms of when it is used, how it is calculated, and how we determine significance?
One environmental group did a study of recycling habits in a California community. It found that 73% of the aluminum cans sold in the area were recycled. (Round your answers to four decimal places.)
What is the difference between a descriptive model that is developed using multiple regression analysis with time-series data and a model that is considered predictive?
They wish to conduct a survey of their students and find a simple random sample of 50 Freshmen, 40 Sophomores, 35 Juniors, and 30 Seniors.
Findout the margin of error for this survey if we want a 99 percent confidence in our estimate of the percent of adults over 50 who take vitamin supplements.
If sample mean is M=44. Is this sufficient to demonstrate significant effect? Again assume a Two-tailed test with a=0.05.
The manager of the greeting card section of Mazey's department store is considering her order for a particular line of Christmas Cards. Develop the payoff table for this decision situations.
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