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To check the Ace company's claim that the total of their 2,500 accounts receivable was $1,175,000 and that the standard deviation of the individual accounts was $ 200 the external auditor took a sample of 25 accounts which totalled $9,475.
a) If the company's report is correct, what is the probability that the average balance of an account in the sample is $394 or less?
b) If the total of the accounts receivable is only $1,000,000 (but the standard deviation was correct), what is the probability the total of the sample would be less than $9,475?
For some positive value of Z, the probability that a standard normal variable is between 0 and Z is 0.3770. Find value of Z? For some value of Z, the probability that a standard normal variable is below Z is 0.2090. Find value of Z?
Commute times: three random samples of time in minutes that commuters are stuck in traffic are shown. At anova =0.05, is there a difference in the mean times among the three cities?
A sample of 25 provided a sample mean of 14 and a sample standard deviation of 4.32. What is the value of "t" for this sample? For a 95% confidence level, what is the critical value of "t"?
In other words, both variables have the same mean but different standard deviations. Draw rough sketches of the two normal curves on the same graph.
The Director of Emergency Medicine at Big Mountain Medical Services is studying patient waiting time. Waiting time is defined as the time from when a patient enters the facility until seen by a physician.
Consider the following continuously operation job shop. Inter arrival times of jobs are described as follows: What is the average time for the 10 new jobs?
Compute a seasonalized or adjusted sales forecast.
Assume that the two groups come from populations with the same standard deviation. Test the claim that the mean score of women is equal to a mean score of men using a 0.02 significance level.
The nighttime cold medicine Dozenol bears the label indicating the presence of 600 mg of acetaminophen in each fluid ounce of drug.
Examining more than one independent variable. Would using several t-tests be appropriate test to use? If not, what would appropriate test be and why?
At the present time, the warehouse is 40 feet deep. How many feet of depth should be added on the warehouse to minimize the annual inventory costs?
A group of 47 randomly selected students have a mean score of 20.2 with a standard deviation of 4.6 on a placement test. Construct a 90% confidence interval for the mean score, , of all students taking the test.
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