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Question: A company is interested in estimating the mean number of days of sick leave taken by its employees. The firm's statistician randomly selects 200 personnel files and notes the number of sick days taken by each employee. The estimated sample mean is 12.2 days and the sample standard deviation is 10 days. How many personnel files would the director have to select in order to estimate μ to within 1 day with a 99% confidence interval?
A. 166
B. 200
C. 385
D. 550
E. 664
8.175 How much power does this study have to detect a mean difference of 5 units in the symptom scale if a two sided test is used with α = .05?
4. Although most of us buy milk by the quart or half gallon, farmers measure daily production in pounds. Ayreshire cows average 47 pounds of milk a day with a standard deviation of 6 pounds. For Jersey cows, the mean daily production is 43 pounds wit..
Normally distributed with a mean of $70,000 and a standard deviation of $20,000. Twenty percents of the loans are larger than what amount?
What would be a good example of a null and alternative hypotheses for a decision relevant in life? What Type I and Type II errors could occur with your decision-making process?
A random sample of gasoline taxes (in cents) is shown here for 12 states. Use the data to estimate the true population mean gasoline tax with 90% confidence. Does your interval contain the national average of 44.7 cents?
Develop a scatter diagram with price as the independent variable and what does the scatter diagram developed in part (a) indicate about the relationship between the two variables?
Determine whether the following equations have a solution or not? Justify your answer. What type of solution do you get for quadratic equations where D
The hospital tests five vials from each shipment. If at least one of the five is ineffective, find the conditional probability pf that shipment's having come from C.
The probability that the daily demand at this store is at least one and at most three is:
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.
Calculate the covariance
A population of scores has p = 44. In this population, an X value of 40 corresponds to z = - 0.50. What is the population standard deviation.
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