Lead Author(s): Kelly Cline
Student Price: FREE
These questions explore constructing null and alternative hypotheses, and ways of testing hypotheses with t tests, p values and confidence intervals.
Two methods are used to predict the shear strength for steel plate girders. Each method is applied to nine specific girders and the ratio of predicted load to observed load is calculated for each method and each girder. What kind of t-test should we use to compare these data?
Two catalysts are being analyzed to determine how they affect the mean yield of a chemical process. Catalyst 1 is used in the process eight times and the yield in percent is measured each time. Then catalyst 2 is used in the process eight times and the yield is measured each time. What kind of t-test should be used to compare these data?