In tests of a computer component, it is found that the mean time ...

[piesebel]

In tests of a computer component, it is found that the mean time between failures is 520 hours.
 
  A modification is made which is supposed to increase the time between failures. Tests on a random sample of 10 modified components resulted in the following times (in hours) between failures.
   518 548 561 523 536
   499 538 557 528 563
  At the 0.05 significance level, test the claim that for the modified components, the mean time between failures is greater than 520 hours.

Question 2

There are 13 members on a board of directors. If they must form a subcommittee of 5 members, how many different subcommittees are possible?
 
  A) 371,293 B) 154,440 C) 120 D) 1287

[Mholman93]

Answer to Question 1

Test statistic: t = 2.61. Critical value: t = 1.833. Reject . There is sufficient evidence to support the claim that the mean is greater than 520 hours.

Answer to Question 2

D

[piesebel]

Great answer, keep it coming

[JaynaD87]

TYSM