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In a recent study of 86 working adults, the mean number of hours per week spent talking on the phone was 21.6. The sd= 5.7 hours.
Calculate the 90% confidence level for the mean.
The format for writing a confidence interval is (xx.x, xx.x)
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
The superintendent of a unified school district of a small town wants to make sure that no more than 5% of the students skip more than 10 days of school in a year.
The data was used to make inferences regarding the other students taking the course. Construct a 95% confidence interval estimate. Explain your findings so that your non-quantitative partner will understand them. Their data is below:
Is it reasonable to conclude that this set of n = 16 people is not a representative sample of registered voters?
To decrease the amount of time it takes to deliver packages, a delivery company purchased computer software that finds the optimal route for making deliveries based upon the input of the package destinations.
Frequently, tests that yield abnormal results are repeated for confirmation. What is the probability that for a normal person a test will be at least 1.5 times as high as the upper limit of normal on two separate occasions?
Is there a significant difference in the proportions of patients reporting pain relief?
Each egg was also measured for volume using a water displacement method. We wanted to know if the two methods agreed or not
Is global F ratio significant? Identify this F ratio, and describe whether it is important.Is coefficient for X1 (productivity) significant? How do you know? Mention its t value and accompanying P-value.
In a class of 40, 16 driver a car made outside the United States. What is the confidence interval for the total population of students at the 95% level?
Set up a hypothesis test to validate this claim. Using a significance level of .01 to test this hypothesis, what is your decision rule
By using the age midpoints x and the percentages of nurses, do we have a valid probability distribution? Describe.
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