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what is the minimum number of employees that should be sampled by the Exxon corporation if it wishes to estimate the true mean number of years to retirement of its employees to within one month of the true mean and with 90% confidence if the range of the data is 7 years?
Use a calculator with mean and standard deviation keys to verify that the sample mean is x = 5.63 pups with the sample standard deviation s = 1.78 pups. (b) Find a 75% confidence interval for the population.
A random sample of 50 households revealed a mean of $112,000 and a standard deviation of $40,000. What is the standard error of the mean?
Assuming that these are a random sample of all publicly traded companies, construct a 95% confidence interval for the overall noncompliance proportion.
The data obtained are shown in the Excel worksheet Problem 4 and below. You are to test to determine if the type of ticket and the type of flight are independent or not. Use alpha = .05
A random sample a 16 Google managers yield the following information on annual salaries. The sample mean is $69,000, with a sample standard deviation of $4,000. What is the mean salary of all Google managers?
Iindicate all samples are approximately Normal with no outliers. Is the ANOVA appropriate?
Gallup Polls When Gallup and other polling organizations conduct polls, they typically contact subjects by telephone. In recent years, many subjects refuse to cooperate with the poll.
Find the probability that at most 5 defective bolts will be found in a box of 200 bolts if it is known that 2 per cent of such bolts are expected to be defective.
Scientist does n ot believe that water ph is 7. She wants to test the null hypothesis that the true level of ph is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a ph of 7. Which p-value will she reject..
What should the average weight be if the production manager wants no more than 6% of the products to weigh more than 7.4 ounces?
Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study to the Discussion Area.
Describe how multiple correlation and/or regression analysis is (or could be) applied in your work or life environments. Define the dependent and independent variables.
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