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An airline finds that 5% of the persons making reservation on a certain flight will not show up for the flight. If the airline sells 180 tickets for a flight with only 175 seats, what is the probability that a seat will be available for every person holding a reservation and planning to fly?
As a manager of an organization, what statistics would you use and why if you wanted to estimate your annual employee turnover? Be sure to specifically identify the statistical formulas and what additional data you would need to determine your est..
Make an interval estimate the population means score for the daycare children so that you are 95% confident that the true mean is in your interval.
Use simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Assume that the forecast for January was for 22 set of tires.
Develop a 90 percent confidence interval for the proportion opposing health care changes. (Round your answers to 4 decimal places.)
Assume your statistics professor reports test grades as z-scores, and you got a score of 2.20 on the midterm exam. Write down a sentence explaining what that means.
Explain why it might be important to look at cancer incidence that is age-adjusted rather than just cancer incidence. Perform simple linear regression on these data and report your finding.
The sample mean of the accounts is found to be y-bar = $94.22, and the sample variance is equal to $455.21. Estimate mu and place a bound on the error of estimation.
Assess the model fit for the multiple linear regression model using appropriate statistics and graphics.
Develop a 99 percent confidence interval for the population proportion.
Which option produces the smallest risk of a Type I error?
Which is the probability of that the median of the sample or average medians be between 320 and 350 minutes?
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds.
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