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The weights of certain machine components are normally distributed with a mean of 9.75g and a standard deviation of 0.08g. Find the weights that separate the top 5% and the bottom 5%.
State the quick rule for a significant correlation and explain its limitations. What sums are needed to calculate a correlation coefficient? What are the two ways of testing a correlation coefficient for significance?
Given the following frequency distribution, find out the mean, variance, and standard deviation.
Search the library for a scholarly journal article of a study that presents the results using correlation analysis. Summarize the article, explain how the correlation was used, and the value of correlation analysis.
Increasing confidence level will increase width of confidence interval. This is because the fact that increasing confidence interval will increase value of z(α/2), which will increase the size of standard error (z*s/√n).
Can we conclude from this that most workers there earn between $25 and $35 per hour? Is this the right interpretation for the margin of error?
Let C be the event that a diner gets the correct meal and let N be the event that a diner gets an incorrect meal. Find the probability that:
Could rejecting the null hypothesis actually be a positive thing in an experiment or test? Please provide and example with your thoughts. Could you think of a situation where rejecting the null hypothesis does not mean the alternative hypothesis is ..
In each month, the proportion of "Prize" bonds that win a prize is 1 in 11000. There is a large number of prizes and all bonds are equally likely to win each prize.
The heights of north American women are normally distributed with a mean of 64 inches and a standard deviation of 2 inches.
You're considering investing in a portfolio of the common stocks of four publicly-traded companies with betas as follows:
For a normal random variable X with mean 70 and standard deviation 10. Calculate the probability that 60 80}.
Operations manager thinks that only 10% of room service orders must take longer than 25 minutes if hotel has good customer service. Does hotel room service fulfil this goal?
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