Reconsider Problem 5 of Section 8.3. Suppose now that the drying time is measured at two…
Reconsider Problem 5 of Section 8.3. Suppose now that the drying time is measured at two different temperature settings T1 and T2. The data obtained are as follows:
Assuming that the drying times for both temperature settings are normally distributed with equal variances, determine a 95% confidence interval for the difference of means of drying times when settings T1 and T2 are used.
A new catalyst is to be used in production of a plastic chemical. Twenty batches of chemical are produced, 10 batches with the new catalyst, 10 without. The results are as shown below:
Assuming normality and that variances are not equal, find a 99% confidence interval for the difference of the means of yields of batches obtained when using the catalyst and when not using the catalyst. On the basis of this interval, do the data support the claim that use of the catalyst increases the average batch yield?