A manager wants to compare the mean time required to build a product using two different assembly methods, A and B. The time per unit was recorded for independent random samples from each method. The results are below. Assuming that the variances for the two populations are equal, use this data to form a 99% confidence interval for the true difference 
between the mean times for the two methods.
Lower confidence limit = , Upper confidence limit = 
The formula for the confidence interval on the difference between two population means when the population standard deviations (or variances) are unknown but are assumed to be equal is 
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All of the following describe the demand for business products except
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