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True/False:
The manager of the quality department for a tire manufacturing company wants to know the average tensile strength of rubber used in making a certain brand of radial tire. The population is normally distributed and the population standard deviation is known. She uses a Z test to test the null hypothesis that the mean tensile strength is 800 pounds per square inch. The calculated Z test statistic is a positive value that leads to a p-value of .045 for the test. If the significance level (α) is .01, the null hypothesis would be rejected.
The 95% prediction interval for a new patient with a 2-day cholesterol level of 220 is
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
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.
For all questions, clearly explain/show your answers. For the Analysis section, justify your answers with the appropriate graphs, statistics, equations, etc.
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Let be the average of the pay you receive for the first and second week. Find the sampling distribution
Use normal approximation to determine probability that x = 2. Illustrate all work.
How many subjects would you approximately need to reduce the length of the 95% confidence interval to 2 units?
Distinct random variable
What is your conclusion regarding null hypothesis?
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study and gender differences were also to be investigated. One of the variables measured was the heart rate after..
Determine the cost Xs to develop the support system for which the probability of exceeding Xs is equal to 0.01?
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