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The customer service department claims that the mean time to correct a shipping error is 10 minutes. A random sample of 60 claims from company records showed the mean to be 9.2 minutes with a standard deviation of 4.7 minutes. At the .02 significance level can we conclude that the mean time to correcting a shipment is less than 10 minutes? Do the following:
a. State the null hypothesis and the alternate hypothesisb. State the decision rulec. Compute the value of the test statisticd. What is your decision regarding Ho?
Find the test statistic value for testing the equality of population means of the two samples.
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
A square yard of carpet is examined for surface defects. Currently, the process produces an average of 2.4 defects per square yard. What is the probability of finding 2 or more surface defects in the sample.
Can we compute the mean length of stay of workers at the company differs from the mean length of stay at that dangerous industry.
A quality inspector is interested in the time spent replacing defective parts in one of the company's products. The average time spent should be at most 20 minutes per day according to company standards.
In a sample of 32 DVD players, what is the probability the average life will be less than 8 years (96 months)? (please round your answer to 4 decimal places).
In a binomial distribution n = 8 and π = 0.2. Determine the probabilities of the following events.
In a previous example about the body mass index of young women we developed a 95% confidence interval for the mean body mass index
Which of the examples below represent the Ratio level of scaling?
What is the 95% confidence interval estimate for the difference between the mean reflectivity reading for Paint A and Paint B? Please complete the blank: "we can be 95% confident that the true difference between the actual means is?
Standard deviation can be assumed known with Q=.28 What is the 95% confidence interval estimate of the mean undergraduate GPA for students admitted to the top graduate schools?
It could not do anything with the airport and suffer a loss of revenue. The current value of raised revenue from a new airport is in question.
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