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A previous study indicated that the standard deviation was 4.6 days. How large a sample must be selected if the company wants to be 85% confident that the true mean differs from the sample mean by no more than 1 day?
Statistics and Probability, Statistics
In a population of Ph.D students 50% have paid assistant ships. A random sample of n=200 students are chosen. What is the expected number of students who have paid assistant ships in this sample?
There are 2 white balls and 8 red balls in an urn. Consider selecting one ball at a time from the urn. What is the probability that the first ball is red and the second ball is also red? Express the probability in fracti ...
The local amateur football club spent ?$2289 on tickets to a professional football game. If the club bought 64 fewer fifteen dollar tickets than five dash eighths the number of twelve dollar ?tickets, how many tickets of ...
Pete Pablo has $20000 to invest. He is very optimistic about the prospects of two companies, 919 Brands and Diaries.com. However, Pete has a very pessimistic view of one company, a financial institution known as Star Ban ...
Given the following values: = 20, M = 16, = 0.7, conduct a one-sample z test at a .05 level of significance. What is the decision for a two-tailed test? A) to reject the null hypothesis B) to retain the null hypothesis C ...
If you are constructing a confidence interval for a population mean, for the same confidence level, the width of the confidence interval will __________ as the sample size increases. Decrease Increase Stay the same Depen ...
Given the following information from Pharoah Corporation, what price would the CAPM predict that the company's stock will trade for one year from today? (Do not round intermediate calculations. Round final answer to 2 d ...
The average height of young adult males has a normal distribution with standard deviation of 2.5 inches. You want to estimate the mean height of students at your college or university to within 0.6 inch with 93% confiden ...
Homework - Conditional Probability & Bayesian Analysis 1) Questions: a. Consider rolling a 6 sided die 100 times to determine the number of times a "1" occurs: i. This is an example of what type of probability? ii. What ...
The number of defective items produced by a machine in a large factory follows a Poisson distribution with a rate of λ=1.5 per day. What is the probabilityThe machine produces exactly zero defective items on exactly two ...
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Why might a bank avoid the use of interest rate swaps, even when the institution is exposed to significant interest rate
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