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A manufacturer of automobile batteries claims that the average length of life for its grade A battery is 60 months. Suppose the standard deviation of the life length is known to be 10 months.
a) Approximately what percentage of the manufacturer's batteries will last between 40 months and 80 months?
b) suppose your battery lasts 37 months. What could you infer about the manufacturer's claim?
Assume that waiting times are approximately normally distributed. Construct a 98% confidence interval for the population mean of waiting times.
Bill calculates a linear correlation coefficient between two variable as 1.20. How would you interpret this?
A member of Congress wants to determine her popularity in a certain part of the state. She indicates that the proportion of voters who will vote for her must be estimated within plus or minus 2 percent of the population proportion.
Puret grinder has required repair service according to the following distribution. Compute the mean, for the following probability distribution of the number of breakdowns per week.
If two randoom samples of sizes n1 = 30 and n2 = 36 are selected independently from two populations with mean 78 and 85, and with standard deviations 12 and 15, respectively, then the standard error of the difference between Xbar1 and Xbar2 are eq..
If wages were increased by $1.00, what is the expected effect on the number of complaints received per employee? How can you tell?
The standard deviation for the costs of all doctors visits is $35.15, estimate with 95% confidence the average cost of a doctors visit for all the patients of this medical clinic.
Define correlation. Then give an example of a misleading correlation and an example of a meaningful correlation. With this describe the relationship between correlation and causation.
Two models of a product - Regular (X) and Deluxe (Y) - are produced by a company. A linear programming model is used to determine the production schedule.
Choose the correct answer using sum of squared error (SSE).
The diameters of oranges in a certain orchard are normally distributed with a mean of 5.26 inches and a standard deviation of 0.500 inches.
Determine fraction of employees cost between $1,500 and $2,000 per year?
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