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An advertising firm's single best client is a food manufacturer. This food manufacturer wants to fine tuned its brand development efforts; enlisting the help of the advertising firm. Advertising firm's data showed that among 280 middle class families, ave. monthly food expenditures amounted to $15,366 with a standard deviation of $2585. In comparison, similar data involving 420 poor families showed an ave. of $7,640 with a standard deviation of $3,022.
A.) Verify that middle class families allocate a statistically larger average amount on food than poor families using the firm's data. Use a 5% significance level in your verification.
B.) Test that the standard deviation in the food allocation of poor families is at most $4,000. Use a 5% significant level.
Construct a 95% confidence interval estimate of their mean weight.
Families in the USA have a monthly magazine that discusses issues related to health and health costs. After surveying 23 of their subscribers
Express Courier Service has found that the delivery time for packages is normally distributed, with mean 13 hours and standard deviation 2 hours.
In order to estimate the proportion of families who prefer female baby-sitters to male baby-sitters with an error of at most 8 percentage points and with at least 95 percent confidence, how large a sample should be taken?
At the .05 significance level, is the number of units produced on the afternoon shift larger?
The sample average is $97, and the SD is $17. Assume that the repair cost has a normal curve. What is the null hypothesis?
The primary difference between an ordinal level and inteval level variable is: an ordinal level variable has a meaningful zero point while the inteval level variable has no zero point
An estimate is needed of the mean acreage of farms in Manitoba, Canada. The estimate should be correct to within 100 acres with probability 0.95. A preliminary study suggests that 500 acres is a reasonable guess for the standard deviation of farm ..
What are the mean value and standard deviation of the number among these 15 that are from the second section? What are the mean value and standard deviation of the number of projects not among these first 15 that are from the second section?
Standard deviation of 100. The top 3% of students receive $500. What is the minimum score you would need to receive this award?
Determine a 95% confidence interval for true time battery pack can function before having to be recharged.
Find the critical value to test the claim that all ages have crash rates proportional to their driving rates. That all ages have crash rates proportional to their driving rates.
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