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Operators are to answer telephone calls from customers in an average time of 0.1 minute or less, and either respond to or refer to the proper department within 0.5 minute. Estimate the actual overall time for both components, in total. A pilot study sample of 30 actual operator times was drawn, with the results in following table.
Component Mean time Standard deviationAnswer 0.1023 0.0183Service 0.5290 0.0902
If the manager wants to be 95 percent confident that the overall time is correctly estimated, with a 3% probability of error, what size sample should be taken?
P bar is .5, alpha is .95, E is .03
A recent study found that the average life expectancy of a person living in Africa is 53 years with a standard deviation of 7.5 years. If a person in Africa is selected at random
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An apple juice producer buys all his apples from a conglomerate of apple growers in one northwest state. The amount of juice squeezed from each of these apples
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What statistical test did the researchers use to determine if there was a statistically significant difference in levels of self-esteem between the boys and the girls?
Construct a decision table for this problem. Include all conditional values and probabilities in the table.
Find the 90% confidence interval for the variance and standard deviation for the time it takes a state police inspector to check a truck for safety if a sample of 27 trucks has a standard deviation of 6.8 minutes.
According to Chebyshev's theorem, proportion of values from data set that is further than 2 standard deviations from the mean is at most?
CCI is unable to adjust the mean of the filling process. However, it is able to adjust the standard deviation of the filling process.
Determine the probability that person's monthly gasoline (gallon) purchases will be less than 67 gallons.
Do these scores suggest that the different foods are differentially preferred by people in general? (Use the .05 significance level.)
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