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To estimate the true mean weight of packages received by a parcel service, 39 packages are randomly selected and weighed. The sample has a mean weight of 15.3 pounds and a standard deviation of 1.9 pounds. Create a 95% confidence interval estimate for the true mean weight of all packages received by the parcel service.
A letter is drawn 1,000 times, at random, from the word A R AB I A. There are two offers. (A) You win a dollar if the number of A's among the draws is10 or more above the expected number. (B) You win a dollar if the number of B's among the drawsis 10..
State the main points of the Central Limit Theorem for a mean. Why is population shape of concern when estimating a mean? What does sample size have to do with all?
Find the test statistic, p-value and critical value and state a final conclusion. Sample data: n=40, mean of the values in a sample = 117, assume that the standard deviation = 14 and the significance level = 0.05
A food processor is concerned that the 16 oz. can of sliced pineapple is being overfilled. The quality control department took a random sample of 50 cans and found that the arithmatic mean weight was 16.05 oz.
A standard deviation of $18. Construct and interpret a 90% confidence interval to estimate the mean weekly gasoline expenditure.
A human resources director, on learning about the regression effect, decides to hire people who have been fired by their previous employer for poor performance.
Describe the five steps of hypothesis testing. Compare Type I and Type II errors and give specific examples for each. Which error should be minimized the most and first?
It is generally believed that electrical problems affect about 14% of new cars. An automobile mechanic conducts diagnostic tests on 128 new cars on the lot. What is the standard deviation for the sample proportion?
Describe a business situation where you would want to use a t-test. Why would you choose that test? What would you expect to show by doing this?
Critically discuss why the dowload is a continous numerical varaible and critically discuss why the download time is a ratio scaled variable.
The survey reported that 31% of the respondents feel they have to save more for retirement to make up for what they lost. Develop a 95% confidence interval for the population proportion.
We want to estimate the population mean within 5, with a 99 percent level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
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