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To help make a decision about expansion plans, the director of a music company needs to know how many compact discus teenagers buy annually. Accordingly, she commissions you, a recent employee, to conduct a survey. Suppose that you randomly selected 250 teenagers and asked each to report the number of CDs purchased in the previous 12 months. You found that the sample mean is 4.26 CDs and the sample standard deviation is 3 CDs. Construct a 95% confidence interval around the sample mean. Be sure to show whether you use the t- or z- value, and what value you use. Interpret the confidence interval in a single sentence. In another sentence, state why you used either the "t" or the "z".
Determine fraction of employees cost between $1,500 and $2,000 per year?
Find out the operating characteristics for this system.
Calculate expected number of interruptions per day. Calculate standard deviation.
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
When the level of confidence and sample size remain the same, a confidence interval for a population proportion π will be __________ when p(1-p) is larger than when p(1-p) is smaller.
Evaluate the mean, the median, and the mode of the salaries. Which best describes a typical salary and Evaluate the range, variance, and standard deviation of the data set. Interpret the results in the context of the real-life setting.
For monthly volume of 300 tables, find out total cost, total revenue, and profit.
Find out the range (R), variance (V) and standard deviation (s) for the given set of values:
What is your conclusion? Are the two variables independent?
Variance of 4.2 and mean of 23.2 were calculated. Find out 95% confidence interval on mean and standard deviation. Describe any potential problems with this analysis.
Solve problem graphically1. Describe optimal solution and objective function value in context of the problem.
A quality control engineer is interested in the mean length of sheet insulation being cut automatically by machine. The desired length of the insulation is 12 feet. It is known that the standard deviation in the cutting length is 0.15 feet. A sam..
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