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A machine for making nuts is known to create nuts with a standard deviation in size of 0.20mm. A tradesman is required to adjust the machine to make 49mm nuts. Unfortunately the machines scale is missing and the tradesman has to adjust it by trial and error. How many nuts does he have to make and test after an adjustment before he can be certain at the 95% level of significance that the machine is calibrated to within 0.04mm of the correct size?
What fraction of the calls last between 4.2 and 5 minutes?
What is a point estimate of the P/E ratio for the population of stocks listed on the New York Stock Exchange? Develop a 95% confidence interval.
The house of representatives has a very controversial bill that will be going to vote. To help formulate his strategy on how to get the bill passed, the chairman of the committee that has been studying the bill wishes to know if there is a divisio..
Suppose that during a basketball practice. Joe tries 3 shots from the free throw line; imagine further that he has a probability equal to 0.6 of making each shot and that the attempts are independent. Let 'X' be the number of baskets he makes in t..
A study of 35 professors showed that the average time they spent creating test questions was 13.5 minutes per question. The standard deviation of the population is 3.8. Which of the following is the 99% confidence interval for the average number o..
Fit a linear regression model for bp against sodium. Do you think this is a model with a good fit? Why?
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
Four components of a time series are secular trend, cyclical variation, seasonal variation, and irregular variation (Lind, 2005). Briefly describe each of these components and provide a real-world example of one component.
The new independent variable improves the predictive power of the regression model.
The number of degrees of freedom for the appropriate chi-square distribution in a test of independence is:
In a certain town, 60% of adults have a college degree. The accompanying table describes the probability distribution for the number of adults
Are there any formulas or graphs for Correlational statistical procedures and Quantative research methods? I'm writing a paper and would like to throw in a few examples with explanation.
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