A study of Brand D washing machines that failed within three ...

[Alygatorr01285]

A study of Brand D washing machines that failed within three years (warranty period) was 23.2. Of those that failed, 82.9 lasted over two years. What is the probability that a washer, which lasts at least two years, will still fail before the end of the warranty period?

Question 2

Explain whether the standard normal distribution or the t-distribution is employed under the following circumstances: A) Population: Not given; Sample size: 50; Population standard deviation: Given B) Population: Normal; Sample size: 16; Population standard deviation: Not given C) Population: Not given; Sample size: 40; Population standard deviation: Given D) Population: Normal; Sample size: 9; Population standard deviation: Given

[nikmaaacs]

Answer to Question 1

0.171

Answer to Question 2

Standard normal; t-distribution; Standard normal; Standard normal

[Alygatorr01285]

TYSM

[daiying98]

Gracias!