Answer Happy

Acrylic bone cement is commonly used in total joint replacement
to secure the artificial joint. Data on the force (measured in
Newtons, N) required to break a cement bond was
determined under two different temperature conditions and in two
different mediums appear in the following table.
(a) Estimate the difference between the mean breaking force in a
dry medium at 37 degrees and the mean breaking force at the same
temperature in a wet medium using a 90% confidence interval. (Round
your answers to one decimal place.) (_______,_______)

(b) Is there sufficient evidence to conclude that the mean breaking
force in a dry medium at the higher temperature is greater than the
mean breaking force at the lower temperature by more than
100 N? Test the relevant hypotheses using a
significance level of 0.10. (Use 𝜇higher
temperature − 𝜇lower
temperature. Round your test statistic to two decimal
places. Round your degrees of freedom to the nearest whole number.
Round your p-value to three decimal places.)