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Suppose that the sales manager of a large automotive parts distributor wants to estimate as early as April the total annual sales of a region. On the basis of regional sales, the total sales for the company can also be estimated. If, based on past experience, it is found that the April estimates of annual sales are reasonably accurate, then in furture years the April forecast could be used to revise production schedules and maintain the correct inventory at the retail outlets.
Several factors appear to be related to sales, including the number of retial outlets in the region stocking the company's parts, the number of automobiles in the regin registered as of April 1, and the the total personal income for the first quarter of the year. Five independent variable were finally selected as being the most important (according to the sales manager). Then the data were gathered for a recent year. The total annual sales for that year for each region were also recorded. Note in the following table that fro rgion 1 there were 1,739 retail outlets stocking the company's automotive parts, there were 9,270,000 registered automobiles I the region as of April 1 and so on. The sales for that year were $37,702,000.
A researcher is interested in the relationship between caffeine consumption and activity level for elementary school children. A sample of 20 children is obtained and the children are separated into two roughly equivalent groups.
Construct the 90% and 99% confidence interval for population mean. Which interval is wider? If convenient, utilize technology to construct confidence intervals.
Using the Hypothesis Tests Two Sample file and a .05 significance level, test whether there is a difference in the mean salary for men versus women.
Population have at least some college education. choose 10 persons at random. Find the probability that at least 5 do not have any college education.
Elucidate the null and alternative hypothesis for the difference among the two means. In testing the difference between the means of two.
Brain cancer is a rare disease. In any year there are about 3.1 cases per 100000 od population. Suppose a small medical insurance company has 150000 people on its books.
What is the probability that the wait for the second student will be 15 minutes or less (to 4 decimals)? What is the probability that the wait for the second student will be between 15 and 45 minutes (to 4 decimals)?
A researcher has reason to believe that, for an experiment with 50 points, a 95% prediction interval would be of width 4. If the researcher wishes to run a more precise experiment that will result in a 95% prediction interval of width 2, then the ..
Calculate table T t . Calculate Computed T c .
Which trend model is best, and why? If none is satisfactory, explain. (e) Make a forecast for 2004 by using a trend model of your choice or a judgment forecast.
Internet is 13.4 hours per week, with the sample standard deviation of 6.8 hours. Determine the 95 percent confidence interval for mean time Wired subscribers spend on Internet.
A contractor is considering a sale that promises a profit of $32,000 with a probability of 0.7 or a loss (due to bad weather, strikes, and such) of $9000 with a probability of 0.3. What is the expected profit?
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