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Study of career paths of hotel general managers sent questionnaires to the SRS of 180 hotels belonging to major U.S. hotel chains. There were 118 responses. Average time these 118 general managers had spent with their current company was 11.1 years. Give 99% confidence interval for mean number of years general managers of major-chain hotels have spent with their current company.
Using the results, describe the effect of an outlier or extreme value on the confidence interval.
A loaf of bread is normally distributed with a mean of 22 oz and a standard deviation of 0.5 oz. What is the probability that a loaf is more than 22.25 oz?
A financial institution transfers a large data faile every evening from offices around the world to its San Antonio headquarters. Once the file is received, it must be cleaned and partitioned before being stored in the company's data warehouse.
A 95% confidence interval for the proportion of all adults who bought a lottery ticket in the past year is (assume Gallup used an SRS)
Given the data set body-weight.sav, use SPSS to calculate the 90%, 95% and 99% confidence intervals for the mean of the variable weight.
What is the probability that the cereal would be high calorie? In other words, what is P (high calorie)?
What does it mean to say that a particular value of x has a z-score of -2.1?
Determine the mean and the standard deviation of the following frequency distribution. (Round your answers to 2 decimal places.)
A researcher claims that the average age of people who buy theatre tickets is 51. A sample of 30 is selected and their ages are recorded as shown below.
Does age make a difference in the amount of savings a worker feels is needed to be secure at retirement? Suppose 210 workers in the 25-33 age category and 176 workers in the 34-52 age category were involved in this study.
What happens to the probability of getting exactly 50% heads?
With the test statistic you chose, work out the problem with solution using .05 level of significance if it applies.
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