Economics Homework Help

For part 2. i will send you an example it is about the benefit of electric cars

1.Aprofessionalrockclimberclaimsthathecanclimbaparticularmountainwithinhalfanhour.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 percent?