A sample of seven concrete blocks had their crushing strength measured in MPa. The results were
1367.6 1411.5 1318.7 1193.6 1406.2
1425.7 1572.4
Ten thousand bootstrap samples were generated from these data, and the bootstrap sample means were arranged in order. Refer to the smallest mean as 
, the second smallest as 
, and so on, with the largest being
a. Compute a 95% bootstrap confidence interval for the mean compressive strength, using method 1 as described on page 391.
b. Compute a 95% bootstrap confidence interval for the mean compressive strength, using method 2 as described on page 391.
c. Compute a 99% bootstrap confidence interval for the mean compressive strength, using method 1 as described on page 391.
d. Compute a 99% bootstrap confidence interval for the mean compressive strength, using method 2 as described on page 391.
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