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The Greater Pittsburgh Area Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area spend getting to work. A sample of 15 workers revealed the following number of minutes traveled.
29, 38, 38, 33, 38, 21, 45, 34, 40, 37, 37, 42, 30, 29, 35
Develop a 98 percent confidence interval for the population mean. Interpret the result. Please explain how you calculate.
Using Microsoft Excel, create a correlation analysis of Wal-Mart's annual net income over the past 10 years compared with Sears's annual net income over the past 10 years and interpret the results.
The average American male wears a size 10 shoe and spends 4 hours a year tying a tie. The average American female college student owns 3.5 pairs of jeans.
Scores on a test are normally distributed with a mean of 60.9 and a standard deviation of 12. Find P81, which separates the bottom 81% from the top 19%.
Examine the behaviour of 99% critical values for these degrees of freedom, and comment on the limits in this case.
Martin Motors has in stock three cars of the same make and model. The president would like to compare the gas consumption of the three cars (labeled car A, car B, and car C) using four different types of gasoline.
Calculate correlation coefficient for these sample data.
The average age of the evening students is significantly different from 21. Use a 0.01 level of significance."Compute the test statistic for the test stated in the problem"
Discuss the factors which might cause variation in the weight of Tootsie Rolls during manufacture.
Find the expected frequency for the number of days in which there was exactly one application. Determine the expected frequency for the other days in a similar manner.
In an article entitled "Fuel Economy Calculations to Be Altered," James R. Healey indicated that the government planned to change how it calculates fuel economy for new cars and trucks.
Draw a scatter diagram. Based on the scatter diagram, does there appear to be any relationship between the number assemblers and production? Explain.
There is concern about the percent of on-time flights. A recent survey of two major airlines yielded the following results. At α = 0.05 test the claim that there is a difference in proportions of on-time flights.
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