Question

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.)

Answer 1

(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. (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.)
t =
df =
p =

Answer 2

@undeadknight26 help me out here please

Answer 3

@Kainui little help?

Answer 4

Where are you stuck or what do you not understand?

Answer 5

I tried a couple times but I can't seem to get the interval right

Answer 6

i know the answer is (19.1, 68.5) and I got something around (30.8, 57.6)

Answer 7

and I don't know where I went wrong

Answer 8

Could you maybe tell me the steps?

Answer 9

What have you tried?

Answer 10

I found the mean of difference (-44), standard dev. (16.31) and then the confidence interval