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what is the minimum number of employees that should be sampled by the Exxon corporation if it wishes to estimate the true mean number of years to retirement of its employees to within one month of the true mean and with 90% confidence if the range of the data is 7 years?
Bowling balls the sample standard deviation was found to be 0.52 pounds. Construct a 95% confidence interval for the variance of the bowling ball weight.
Using the .02 level of significance, conduct a five-step hypothesis testing procedure to determine if the new processes significantly reduced the wait time.
Compute the Kappa statistic and its standard error regarding reproducibility of the diagnosis of dyspnea in the clinic.
In as sample of 855 bartenders, 48% report hearing complaints from patrons about their jobs. If the maximum error of estimate for the proportion of bartenders hearing job complaints is 4.4 percentage points, what is the degree of confidence used?
Given the same significance level, a ________ value of t will be required to reject the null hypothesis compared to the value of z required for rejection.
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..
Find out whether quality of items produced appears to be independent of production process used. Compute expected number of defective units produced by Process 1.
Normal distribution of 5 pounds per square inch, standard deviation of 1.5 pounds per square inch, what proportion have less that 3.17 pounds per square inch, at least 3.6 pounds, are between 5 and 5.5 and 95% will be contained between what two va..
In Excel use the Descriptive Statistics and comment on the mean, the skewness, the standard deviation and kurtosis.
The post-anesthesia care area (recovery room) at St. Luke's Hospital in Maumee, Ohio, was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25. A random sample of 15 days revealed the ..
Testing equality of two means - difference in performance of the two gasolines and difference in gasoline mileage output
Which variable is the independent variable and which is the dependent variable? Write out the regression equation and sketch it on the plot. What percentage of the variability in the defect rate can be explained by differences in volume?
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