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The average sales per store of ABC Inc.'s best-selling product in a supermarket chain last year was $12,000. A random sample of 61 stores selected from the chain shows that this year the average sales per store is $13,500 with a sample standard deviation of $12,000. Determine whether there has been a significant increase in the average sales per store.
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p- value.
In a sample of 210 members, 160 employees took all of their vacation days. Therefore, the test statistic is 1.38. When testing the executive's (using a 1% level ofsignificance), what is the pvalue?
The amount of income spent on housing is an important component of the cost of living. The total costs of housing for homeowners might include mortgage payments, property taxes, and utility costs (water, heat, electricity).
Predicting oil spill evaporation. The Journal of Hazardous Materials (July 1995) presented a literature review of models designed to predict oil spill.
In Gallup polls taken at different times, subjects were asked if they owned a gun, and the number of yes responses was recorded for each time period. Is this discrete or continuous? why?
Following are measurements of tensile strength in ksi (x) and Brinell hardness (y) for 10 specimens of cold drawn copper. Assume that tensile strength and Brinell hardness follow a bivariate normal distribution.
Although Bob raised the price to $1.75, sales of quarter-pound burgers rose to 8,200. Explain why this does not represent a violation of the law of demand.
1. What is the market penetration rate based on potential customers? 2. What is Allison's unit market share (based on stalls cleaned)?
Make a 99% confidence interval for the mean construction cost for all vacation homes built in this region during the past 2 years.
What test can be performed to compare the percentage of participants who developed abnormal triglyceride levels between the vitamin A group and the trace group? Implement the test in Problem 10.68, and report a two tailed p value.
The purchasing department has found an excellent global positioning system circuit card in Germany that can provide your firm with a competitive advantage in the marketplace.
Assume that you examine the working arrangements of married couples. You found out that 88% of the couples had at least one working member.
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