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An economics professor randomly selected 100 millionaires in the United States. The average age of these millionaires was 54.8 years with a standard deviation of 7.9 years. What is the 95% confidence interval for the mean age, poplulation mean of all United States millionaires?
Would it be appropriate to say the coefficient of determination (R-squared) is the proportion of variation in Y due to the variation within each of the categories of X?
Use Hypothesis testing to determine if Dr. Boom is correct, that his sample of 25 rockets weight less than the average rocket.
For the following, describe the target population, sampling frame, sampling unit and observation unit. Is there any selection bias or inaccuracy of responses?
A professor is targeting a score of 80 on an exam. His forty-nine students averaged 78 on an exam with s = 7. Are the scores significantly less than 80 at a significance level of 0.05? Show your work and state the conclusion.
Testing for a linear correlation. Construct a scatter plot, find the value of the linear correlation coefficient r, and find the critical values of r from the table below using a=0.05.
What assumption must you make about the population distribution in order to construct the confidence interval estimate in (a)?
Using the probabilities above what is the expected size of family you draw?
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
If we were to ask three people at arbitrary, determine the probability that they will all prefer punk rock?
Does the normal distribution yield a good approximation of the actual results?
The number of messages sent to a computer bulletin board is a Poisson random variable with a mean of 5 messages per hour.
At the end of each academic year, 13% of assistant professors become associate professors and 18% leave the department; 21% of associate professors become full professors, and 17% leave the department; and 9% of full professors leave the departmen..
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