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A machine produces metal rods used in an automobile suspension system. A random sample of 15 rods is selected,and the diameter is measured. The resulting data (in millimeters) are as follows:
8.248.258.208.238.248.218.268.268.208.258.238.238.198.288.24
(a) Check the assumption of normality for rod diameter.(b) Calculate a 95% two-sided confidence interval on mean rod diameter.(c) Calculate a 95% upper confidence bound on the mean. Compare this bound with the upper bound of the two-sided confidence interval and discuss why they are different.
Suppose we have a population of scores with a mean = 200 and a standard deviation = 10. Assume that the distribution is normal. Provide answers to the following questions:
You are looking at a bond to add in your portfolio. The bond has a 7.2 percent coupon (paid semiannually), 10 years left to maturity, and can be purchased at par ($1,000).
Does the data prove a significant difference in mean times?
What is the difference between the critical-value method and the p-value method of hypothesis testing? Include in your post how the question's topic pertains to your health discipline.
We considered Mary's interest in doing a study to see if learning of 6th graders on a math lesson is affected by background noise level. She was planning to use 2 noise conditions and then analyze her outcomes using a t-test for independent groups..
Using your knowledge of infectious disease epidemiology, quantify the pattern of disease X in this group, i.e., what are the infectivity, pathogenicity, and virulence of disease X?
A catering company is buying equipment in order to set up their own store. They have a choice of two ovens that they can purchase for the store.
What is the distinction between a one-sided and a two-sided hypothesis test in this problem?
A health club has six tennis courts. The owner hypothesizes that his patrons have no preference for a particular court. He observes how many people play on each court on a particular day. Compute the expected value for the data shown below.
There is a program for STD/HIV/pregnancy education/prevention called Postponing Sexual Involvement (PSI) run in Atlanta. Evaluation data collected at the end of ninth grade as a follow-up to the program compared two group of adolescents
The sample size n, the sample means, and the sample standard deviations for the two groups are given
A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product.
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