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The population of IQ scores forms a normal distribution with a mean of µ=100 and a standard deviation of σ=15. What is the probability of obtaining a sample mean greater than M=105, for a random sample of n=9 people? For a random sample of n=36 people?
Is it possible to provide a meaningful interpretation of the intercept of the sample regression line? Explain.
You took a sample of your expenses for 20 weeks and found that the average is $285 and the standard deviation for the sample is $25. Set up your null and alternative hypothesis for testing whether your cists are different and do the analysis using..
Create a 90% confidence interval for mean score on this placement exam for all students.
Determine the regression equation, letting the first variable be the independent (x) variable. Find the indicated predicted values.
Assume that the class has 60 students and that the examination period is 90 minutes in length. How many students do you expect will be unable to complete the exam in the allotted time.
You are given the following data. Test the claim that there is a difference in the means of the two groups. Use = 0.01. State the null and alternate hypotheses
In a poll of 400 randomly selected voters, 204 of them support the strategist's candidate. At = .05, is the political strategist's claim warranted?
With a sample standard deviation of 200 pounds. We know the sample is from a normal distribution. The 95% confidence interval of the true mean is?
Describe why ordinary least squares solution is not unique. What can you say about residuals of any solution? Is ridge regression solution unique? Explain why or why not?
If the manager decides to spend $3000 on advertising, based on the simple linear regression results given above, what would the estimated sales be?
Construct a 90 percent confidence interval for the proportion of all kernels that would not pop.
Construct the 90% and 95% interval estimates for the population mean weekly sales.
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