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A sample of 300 is taken and the sample mean is computed to be 7.65 and the sample standard deviation is 5. Assume the data is ratio level.
Compute the 95% confidence interval on the mean.
Compute the 3.9% confidence interval on the mean
Which confidence interval is more practical and useful in a business situation? Why?
To maximize Andre's probability of landing on the net, how far away from the cannon should he position the nearest edge of the net?
A recent census of a small town in Michigan showed that 60% of the residents are male, 20% have college degrees, and 15% are both male and college graduates.
Please define correlation and regression. Describe a management or business-related scenario where a researcher might be interested in whether a number of variables are correlated (without any assumptions about causation).
A survey was conducted to measure height off men. In survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 69.2 inches and a standard deviation of 2.0 inches.
A woman has n keys, of which one will open her door. (a) if she tries the keys at random, discarding those that do not work, what is the probability that she will open the door one her kth try?
The probability that a given alternator will fail on a 1-hour flight is .02. What is the probability that (a) both will fail? (d) Neither will fail? (c) One or the other will fail? Show all steps carefully.
What is the probability of a fatal accident over a lifetime? Explain your reasoning carefully. Hint: Assume independent events. Why might the assumption of independence be violated? Why might a driver be tempted not to use a seat belt "just on thi..
The mean daily amount of her tips was $84.85. At the .01 significance level, can Ms. Brigden conclude that she is earning an average of more than $80 in tips?
If you are using the method of least squares for fitting trends in an annual time series containing 25 consecutive yearly values.
The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males.
What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 5 of µ? Use the value 20 for the population standard deviation of scores on this subsection.
Managers at Beta Technologies, Inc., have collected current annual salary figures and potentially related data for a random sample of 52 of the company's full-time employees.
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