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Test the claim that the mean age of people in the United States who would say yes to the survey question shown in the table is 60 years or older. Use a = 0.10 and assume that the population is normally distributed. Write a paragraph that interprets the test's decision.
Suppose that a model for the joint distribution of these rvs is a bivariate normal distribution.
A point estimate for the difference between the mean purchases of the users of the two credit cards is:
Electricity is commonly traded at the California-Oregon border (COB) and Palo Verde (PV) in Arizona. Assume you take a sample of 100 daily electricity market closing prices (in $/megawatthour) from both COB and PV.
If a random sample of 10 people found that 9 were pro-life (i.e., 90%), while another random sample of 1000 people from the same population found that 550 were pro-life (i.e. 55%), which would you find to be more significant? Why?
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
What is the approximate probability that the total time spent on the calls will be greater than 98 minutes? Give your answer to four decimal places.
Then comment on the effectiveness of the presentation: Were the frequency distributions used effectively to report the results? Why or why not?
what is the probability of selecting a sample mean of 7 or less , with a sample population of 9 and mean of 10 and a standard deviation of 3.
The population of lengths of aluminium-coated steel sheets is normally distributed with a mean of 30.05 inches and a standard deviation of 0.2 inches.
Use Hypothesis Testing and the data in the course materials folder to analyze the difference in milk production in California. Formulate both a numerical and verbal hypothesis statement regarding your research issue.
Find the mean for the random variable X, the number of students who work full time in sample of size 16. Please round your answer to two decimal places.
What is the probability that a randomly chosen package is improperly sealed?
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