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A Wendy's franchise has been averaging about $5000 worth of business on a typical Saturday with a standard deviation of σ = $500. The manager is concerned that sales are slipping, after taking into account the average value of sales for four consecutive Saturdays being $4800.
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
Where should the warranty limits be set so that only 10% of the TVs need repairs at the manufacturer's expense?
Determine the 90% confidence interval for average days worked by employees in all payroll departments?
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
Karefree State University has an enrollment of 18,000. Researchers took a sample of 900 and found 477 students wanted a Field Hockey team. Construct the 95% and 99% Interval estimates for the population proportion.
The results of a recent poll on the preference of shoppers regarding two products are shown below.
New study is to use 90% confidence level. Estimate is to be within 1 percent of population proportion. Determine the essential sample size?
Construct a 95 percent confidence interval for the population mean. Is it reasonable that the population mean is 28 weeks? Justify your answer.
To test the given claim using Single Proportion Z test.
An experiment consists of selecting a card at random from a 52-card deck. Refer to this experiment and find the probability of the event.
At 95% confidence, test to determine if more than 21% of the population will like the new soft drink.
Die with 4 sides {1, 2, 3, 4} is tossed 2 times. Let X equal maximum of two observations and let Y equal minimum. Determine joint pmf of X and Y, and correlation coefficient. Are X and Y independent?
The daily numbers of calls received by the Internal Revenue Service office in July are shown below:
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