Author Question: A professional rock climber claims that he can climb a particular mountain within half an hour. From ... (Read 87 times)

drink · **on:** Jun 24, 2018

A professional rock climber claims that he can climb a particular mountain within half an hour. From a random sample of 20 attempts, the rock climber averaged 33.3 minutes with a standard deviation of 3.9 minutes.

Is there sufficient evidence to suggest that the climber's claim is incorrect at a significance level of 10 per cent?

Question 2

What is the value of A?

A) 6
B) 5
C) 3
D) 2

chreslie · **Reply #1 on:** Jun 24, 2018

Answer to Question 1

H0 : 30 against H1 : > 30
Test statistic t = (33.3 - 30 / (3.9/4.5 ) = 3.8
Since t19,0.1 = 1.328, we reject H0 at 0.1
Therefore, there is sufficient evidence to disprove the climber's claim.

Answer to Question 2

C