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Bob's Sporting Goods believes the average age of its customers is 40 or less. A random sample of 60 customers was surveyed, and the average customer age was found to be 42.7 years. Assume the standard deviation for customer age is 8.0 years. Using a = 0.02, answer the following questions:
a) Does this sample provide enough evidence to refute the age claim made by Bob's Sporting Goods?
b) Determine the p-value for this test.
c) Identify and interpret the critical sample mean or means for this problem.
d) Verify your results using PHStat2.
One-fourth of the residents of the Burning Ridge Estates leave their garage doors open when they are away from home. The local chief of police estimates that 5 percent of the garages with open doors will have something stolen
In the study of age and systolic blood pressure of five randomly selected subjects, a researcher reported the following data.
an important feature of golf cart batteries is the number of minutes they will perform before needing to be recharged.
In total, of 1000 applications they got from men, they hired 625, or 62.5%. Based on numbers presented, what do you believe of the discrimination claim?
The article should include a margin of error and confidence interval. Discuss the subject matter in the article, and interpret the results and what the confidence interval and margin of error mean as they apply to the specific subject matter.
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance.
A population of scores forms a normal distribution with a mean of 40 and a standard deviation of 12. What is the probability of randomly selecting a score less than x=34?
according to thepoultrysite.com the weights of broilers are approximately normally distributed with a mean of 1387
The average shaft size for the E300 electric motor is .55 inch, with a standard deviation of .10 inch. It is normally distributed. What is the probability that a shaft selected at random will be between .55 and .65 inch?
Based on your answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
statistics is a method of decision making in the face of uncertainty and the basis of numerical data and calculated
Create a real-world situation or problem that could be addressed using an independent- or related-samples t test. Create this situation or problem, that clearly identify the independent and dependent variables to study
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