Question

In: Statistics and Probability

Consider the accompanying data on breaking load (kg/25 mm width) for various fabrics in both an...

Consider the accompanying data on breaking load (kg/25 mm width) for various fabrics in both an unabraded (U) condition and an abraded (A) condition.

Use the paired t test to test:
H0: μD = 0 versus Ha: μD > 0
at significance level 0.01. (Use μD = μU-A.)
Note: The data below is formatted such that you can copy and paste it into R.

Fabric
1 2 3 4 5 6 7 8
U = c(   36.5,   55.0,   51.2,   38.7,   43.2,   48.8,   25.6,   49.6)
A = c(   28.5,   20.0,   46.0,   34.0,   36.5,   52.5,   26.5,   46.5)

Calculate the mean difference and standard deviation.

d =
sd =


Compute the test statistic value. (Round your answer to three decimal places.)
t =

p-value =

State the conclusion in the problem context.

Reject H0. The data suggests a significant mean difference in breaking load for the two fabric load conditions.Fail to reject H0. The data suggests a significant mean difference in breaking load for the two fabric load conditions.    Reject H0. The data does not suggest a significant mean difference in breaking load for the two fabric load conditions.Fail to reject H0. The data does not suggest a significant mean difference in breaking load for the two fabric load conditions.

Solutions

Expert Solution

Let us denote the difference

d = U - A

The conclusion in the problem context :

Fail to reject H0. The data does not suggest a significant mean difference in breaking load for the two fabric load conditions.


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