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A random sample of 172 students was asked to rate on a scale to from 1 (not important) to 5 (extremely important) health benefits as a job characteristic (note that the rating scale can also have decimals, i.e. a student can give a rating of 1.32). The sample mean rating was 3.31, and the sample standard deviation was 0.70. For a type I error of 1% (alpha), can you be reasonably certain that the average rating is more than 3 in the population?
1. State the null and alternative hypotheses.
2. Specify the rejection region for = 0.01. Reject H0 if
3. Calculate the test statistic
4. What is your conclusion?
5. Obtain the lower bound of a 99% confidence interval for the mean rating.
6. Obtain the upper bound of a 99% confidence interval for the mean rating.
A quality-control manager randomly selects 70 bottles of ketchup that were filled on S1 to assess the calibration of the filing machine. Determine the population study?
1.a manufacturer of infant formula is running an experiment using the standard control formula and two new formulas a
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Estimate the true proportion of all Americans who are in favor of gun control legislation using a 90% confidence interval.
A survey of undergraduate students in the School of Business at Northern University revealed the following regarding the gender and majors of the students:
Based on my calculations, what is the arrival and service rate for the express lane with 10 items or less? What is the arrival rate and service rate for the other customers with more than 10 items and what is the average arrival rate and service r..
Modify above problem (Problem 8th) so that each hardware vendor now demands seventy-five (75) units. Any units available from the vendors that are not shipped cost nothing.)
How many bolts should be sampled in order to make us 95% confident that the sample mean bolt length is within .02 inches of the true mean bolt length?
Is the event of choosing card green or blue on the first selection independent of choosing card green or red on the second selection? Why or why not?
The article "Response of SiCf /Si3N4 Composites Under Static and Cyclic Loading-An Experimental and Statistical Analysis" (J. of Engr. Materials and Technology, 1997: 186-193) suggests that tensile strength (MPa) of composites under specified con..
Discuss the use of standard deviation. Explain how it might be useful to you in your research and how you would explain results using standard deviation.
Solve the initial value problem y' = 2y + 3, y(0) = 2. The population p(t) of the South American Agouti satisfied the population law dp/dt = 0.05p - 450, where the factor 0.05 reflects the birth rate and the -450 is a constant harvest rate due to ..
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