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What is the effect on a confidence interval if one decreases both sample size and the level of confidence?Please provide a detailed answer.
Compute a 90% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24, and 59. Change the number from 59 to 24 and recalculate the confidence interval.
Independent random samples of 12 users of the other system rate their system on the same scale. Based on these data, are the two telecommunication system equally liked? Explain.
A stationery store to estimate the mean retail value of greeting cards purchased by its customers when they visit the store. A random sample of 15 customers indicates a mean amount of $2.55 with a standard deviation of $0.44 per customer per visi..
The weights (in pounds) of a sample of five boxes being sent by UPS are: 12, 6, 7, 3, & 10.
The McBurger restaurant chain claims that the waiting time of customers for service is normally distributed with a mean of 3 minutes and a standard deviation of 1 minute.
Let X be the number obtained on the blue die minus the number obtained on the red die. Draw a histogram for its probability function and a graph for its distribution function.
A nationwide real estate company claims that its average time to sell a home is 57 days. Suppose it is known that the standard deviation of selling times is 12.3 days and that selling times are normally distributed.
The consultant is given a sample of 225 batteries to test. A. Calculate the standard error of the mean.
Plot the data on U.S. general aviation shipments (b) Describe the patterns and discuss possible causes.(c) Would a fitted trend be helpful? Explain. (d) Make a similar graph for 1992-2003 only.
The standard deviation was 2. At α = .10, is the number of years' experience of the taxi drivers really less than the taxi company claimed?
Describe the data appear the strength of the relationship among variables is sufficient to warrant using linear regression forecasting.
Construct a 90% confidence interval for the standard deviation of the number of hours this firm's employees spend on work-related activities in a typical week.
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