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At a local university, a sample of 49 evening students was selected in order to determine whether the average age of the evening students is significantly different from 21. The average age of the students in the sample was 23 years. The population standard deviation is known to be 3.5 years. Use the critical value approach to determine whether or not the average age of the evening students is significantly different from 21. Use a 0.01 level of significance.
HO: μ "State the null hypothesis."HA: μ "State the alternativel hypothesis."
"State the rejection rule"
"Compute the test statistic for the test stated in the problem"
"State if you reject or fail to reject the null hypothesis."
Use a .05 significance level to test claims that quarters manufactured with the new equipment have weights with a standard deviation less than .061
What is the point estimate of the students mean salary? What is the point estimate of the standard deviation of the students salaries? Construct a 95% confidence interval for the mean salary of the DM students?
One day, you notice your 6' 2" roommate's size 12 shoes and comment, "I think height and foot size are correlated". You're somewhat surprised (and irked) by his response, "I think short people have big mouths."
Determine proportion of patients have glucose levels exceeding 115? If the patient has glucose level of 140, what percentile is this?
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
The credit score of a 35 year old applying for a mortgage at Ulysses Mortgage Associates is normally distributed with a mean of 600 and a standard deviation of 100.
At the .05 level, you are testing whether there is a significant difference in the proportions of college students and similar aged non college students having accidents during the two year period. What is the value of your test statistic.
In a sample of 1,000 representing a survey from the entire population, 650 people were from Laketown, and the rest of the people were from River City.
Chances to increase in value, decrease in value, or remain the same. Estimate the probability at least two of the stocks increase in value.
If sales invoices are automatically calculated and posted by a company's computer system, can the auditor reduce substantive tests of transactions for the accuracy objective? Why?
What are the assumptions and requirements for an LP model to be formulated and used? Under what conditions will an LP problem: be unbounded? be infeasible? have more than one optimal solution?
In a study of 24 criminals convicted of antitrust offenses, the average age was 55 years, with a standard deviation of 7.6 years. Construct a 98% confidence interval of the true mean age.
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