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The Edge Convenience Store has approximately 300 customers shopping in its store between 9 am and 5pm on Saturdays. In deciding how many cash registers to keep open each Saturday, Edge's manager considers two factors: customer waiting time (and the associated waiting cost) and the service costs of employing additional checkout clerks. Checkout clerks are paid an average of $10 per hour. When only one is on duty, the waiting time per customer is about 10 minutes (or 1/6 hour); when two clerks are on duty, the average checkout time is 6 minutes per person; 4 minutes when 3 are working and 3 minutes when four clerks are on duty. Edge's management has conducted customer satisfaction surveys and has been able to estimate that the store suffers approximately $13 in lost sales and goodwill for every hour of customer waiting in line to checkout. Using the information provided, determine the optimal number of clerks to have on duty each Satyrday to minimize the store's total expected cost.
One group is given the new drug and the other group is given the standard drug. Data are recorded on the effects of each drug. Is the research division using dependent or independent samples? Why?
Compute the probability that debt for a randomly selected borrower with good credit is more than $18,000?
What does a squared correlation coefficient represent? Also, does the strength of the correlation depend on the direction? Finally, does correlation imply causation.
The standard deviation of the sample is $3,000. Interpret your findings.
Describe the factors that might cause variation in weight of Tootsie Rolls during manufacture.
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
The sample mean is 2.59 and the sample standard deviation is .66. Conduct the following test using 95% level of confidence.
Illustrate is the range of values for a coefficient of correlation. Illustrate degree of relationship do values of the correlation coefficient (r)with magnitudes close to 1.00 indicate.
A random sample of 52 groups gave a mean of $8.30 with a standard deviation of $2.42. Find a 90% confidence interval for the mean amount left by all groups.
Develop a seasonally adjusted forecast model for these sandwich sales data. Forecast demand for each season for 2004 using a linear trend line estimate for sales in 2004. Do the data appear to have a seasonal pattern?
How would you use the binomial distribution in making a business decision during a normal day of work in the career of your choice?
The researcher expects a 12-point treatment effect and plans to use a two-tailed hypothesis test with a = 0.05.
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