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A study of the career paths of hotel general managers sent questionnaires to an SRS of 170 hotels belonging to major U.S. hotel chains. There were 109 responses. The average time these 109 general managers had spent with their current company was 11.3 years. Give a 99% confidence interval for the mean number of years general managers of major-chain hotels have spent with their current company. Take it as known that the standard deviation of time with the company for all general managers is 3.7 years.
Discuss at least three reasons why these predictions may not be accurate and offer three ways in which you can increase the likelihood of accurately predicting your customers' purchases.
Test the hypothesis that the machines are showing difference qualities of performance. Use 5 per cent level of significance.
Determine the chance between 39% and 41% of registered voters in sample are Democrats.
Report the t-value, whether you accept or reject Ho, and whether the difference was significant in a brief sentence.
Develop a 95% confidence interval for the mean amount of household income for sub- scribers to Young Professional magazine. Interpret this interval.
Millie and Senta Meter have recently taken Pre and Post test in achievement. The test were normally distributed. Millie's percentile rank changed from 57.93 to 77.34. Senta's changed from 1.07 to 4.95.
A real estate company wants to study the relationship between house sales prices and some important predictors of sales prices. Based on data from recently sold homes in the area, the variables
A fast-food restaurant sells hamburgers and chicken sandwiches. On a typical weekday, the demand for hamburgers is normally distributed with a mean 313 and a standard deviation 57; the demand for chicken sandwiches is normally distributed with a m..
A researcher demonstrated a correlation of r = 0.60 between teacher attire and student academic performance across 150 grade schools in her state.
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
Estimate the probability that a randomly selected jar will have a fill, x, that is out of specification. Assume that the process is in control and that the population of all jar fills is normally distributed.
Find a 99% confidence interval estimate of the proportion of people who say that they voted.
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