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A cell phone company offers two plans to its subscribers. At the time new subscribers sign up, they are asked to provide some demographic information. The mean yearly income for a sample of 40 subscribers to Plan A is $59,100 with a standard deviation of $9,200. For a sample of 30 subscribers to Plan B, the mean income is $63,000 with a standard deviation of $7,100. At the .01 significance level, is it reasonable to conclude the mean income of those selecting Plan B is larger? Hint: For the calculations, assume the Plan A as the first sample. The test statistic is ???? . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
What is the preventive maintenance cost that makes the manager indifferent between a one week and a two week preventive maintenance strategy?
Evaluate the expected value of the total number of sales
Consider the particle size of a particular product.
Do the independent variables correlate statistically significantly and practicallywith the dependent variable and is collinearity between the independent variables a concern?
The average revenue per retail user
Are they weak or strong correlations - what is the significance value and what does the significance value reveal about the data we have used?
The degree of flatness or peakedness of a population
an article that deals with sleep and shift-workers.1.what can you tell us about the journal that this article was
question 1 a normal population has a mean of 78 and a standard deviation of 6. you select a sample of 50. evaluate the
And the rest of the people were from River City. Out of the sample, 19 people had some form of cancer. Thirteen of these people were from Laketown
Use Analyze, Descriptive statistics, Frequencies to summarize nonmetric variables, and create a pie-chart for Year in college and create a histogram for IQ and include the normal distribution.
Calculate the expected value, variance, and standard deviation of the total income
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