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A) A nutritionist wants to estimate the mean amount of cholesterol in a certain variety of chicken eggs. She wants to be within 14 mg. with 99% confidence. It is believed that the standard deviation is 25 mg. How large a sample of eggs should she use?
B) A nurseryman wants to estimate how many poinsettias he will need for Christmas. He estimates the standard deviation to be 15. If he wishes to be 95% certain of having enough plants, how large a sample must he take to be within 5 plants?
C) The manager of a supermarket wants to estimate the proportion of customers who will be using food stamps at his store. How large a sample is required to estimate the true proportion to within 2% with 99% confidence?
Data on distribution of cost for building effort, design work and testing effort.
Which of the variables below do you think will be roughly normally distributed? Please select all that apply.
Determine the area under the standard normal curve that lies: (a) to the left of Z = -2.31 (b) to the right of Z = -1.47 (c) between Z = -2.31 and Z = -1.47 (d) between Z = 1.47 and Z = 2.31
Find the test statistic P-value, and critical value, and state the final conclusion.
How many departments would they need to survey to achieve this level of accuracy with 95% confidence?
Conduct a mini-meta-analysis. There is really no such thing as a mini-meta-analysis, but you don't have time to conduct a full meta-analysis.
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?
Critically discuss the characteristics of integer programming problems. Provide specific instances in which you would use an integer programming model rather than an LP model. Provide real-world examples.
Girl B throws 15 times, with a prob. of success = 0.2. And girl C throws 20 times, with a probability of success equal to 0.1. Determine the probability that the target will get hit at least 12 times.
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
What is the possibility that for a arbitrarily selected customer the service time could exceed 3 minutes?
For this same sample of n = 45, find out the width of confidence interval around population mean? Illustrate all work.
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