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A production process assumes a population mean of µ = 80. Periodically this process is tested. A Sample of n = 100 is taken. The standard deviation = 8. The firm has already decided that any sample mean below 78 or above 82 will signal the workers that the process is not working properly. Using this information, calculate Beta risk (probability of Type II error) if the true population mean really is 77.
Significance level to test the claim that less than half (.5) of all executives identify that error as being the most common job interviewing error.
Find the value of Z-score- standard normal distribution.Find out a value of the standard normal random variable z, call it z0.
ABC Corporation has been using statistical process control for several months.
The following table shows the number of miles driven in each trial.
Select a random variable to represent the category. Produce a probability mass function for that variable, and use it to compute the mean, the median and the variance of the data in the data set. Show the probability mass function, both in tabular..
The management of a department store is interested in estimating the difference between the mean credit purchases of customers using the store's credit card versus those customers using a national major credit card.
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
how many individuals will I need to sample if I want a 95% margin of error to be no more than 3%, I want to know if the results are significant at = 10%. With the information given.
Find a 95% confidence interval for the mean dielectric strength of the oil.
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
Determine the standard error of students that favoured the move.
In comparing two variances below, determine test value and what are degrees of freedom that must be used?
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