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Fifty people in the civilian labor force are randomly selected and the sample average age is computed to be 36.4.
(a) Find a 90% confidence interval for the mean age, ?, of all people in the civilian labor force. Assume that the population standard deviation for the ages of civilian labor force is 12.1 years. Interpret the confidence interval.
(b) It is being claimed that the mean age of the population of civilian labor force is 40. What do you conclude based on the confidence interval?
A psychologist is investigating the hypothesis that children who grow up as the only child in the household develop different personality characteristics than those who grow up in larger families.
Death would be expected based on statewide mortality rates. Is the number of deaths from COPD in this group excessive?
Write a Results section in current APA style describing the outcome - difference in satisfaction ratings in an assisted living facility between residents who had a pet with them vs. those who did not have a pet.
in bernoulli trials p let vn be the number of trials required to produce either n successes or n failures whichever
A producer of pleasure boats wants to maximize revenue during the next month. Two types of boats are sold, x1 and x2. Type x1 sells for $40,000 and type x2 sells for $30,000. The x1 boats require 10 weeks of labor and 600 board feet of lumber each..
Given the following data on Asian and European Share of U.S. Light Truck Sales(1990-2003): Which trend model is best, and why? If none is satisfactory, explain.
Find the probability that all 3 ignition systems are good.d- which is better: the answer from part (b) or the answer from part (c)? why?
1.some researchers have conjectured that stem-pitting disease in peach tree seedlings might be controlled with weed and
The owner of Britten's Egg Farm wants to estimate the mean number of eggs laid per chicken. A sample of 20 chickens shows they laid an average of 20 eggs per month with a standard deviation of 2 eggs per month.
the number of complaints that a discount store receives on their product per week is a random variable having poisson
Should H0 be rejected? What should the researcher conclude and determine the 95% confidence interval for the population mean, based on the sample mean.
Is there a relationship between whether or not someone completed and returned their 2011 census report and their opinion of gun control?
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