It has been hypothesized that treatments (after casting)
Chapter 13, Problem 30E(choose chapter or problem)
It has been hypothesized that treatments (after casting) of a plastic used in optic lenses will improve wear. Four different treatments are to be tested. To determine whether any differences in mean wear exist among treatments, 28 castings from a single formulation of the plastic were made and 7 castings were randomly assigned to each of the treatments. Wear was determined by measuring the increase in “haze” after 200 cycles of abrasion (better wear being indicated by smaller increases). The data collected are reported in the accompanying table.
a Is there evidence of a difference in mean wear among the four treatments? Use \(\alpha=.05\).
b Estimate the mean difference in haze increase between treatments B and C, using a 99% confidence interval.
c Find a 90% confidence interval for the mean wear for lenses receiving treatment A.
Equation transcription:
Text transcription:
alpha=.05
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