Question

i) State the Hypotheses to Test. ii) Make a decision based on the information given. iii) What would be Type I and Type II errors.

Answer 1

Ans:

4)

Ho :μ = 8.9

HA :μ> 8.9

Right tailed test

Test statistic:

z=(9.7-8.9)/(3.4/sqrt(40))

z=1.488

p-value=P(z>1.488)=0.0691

assume alpha=0.05

As,alpha>0.05,we fail to reject the null hypothesis.

There is not sufficient evidence to conclude that mean lifetime is longer than 8.9 years.