## 8 thoughts on “Exam # 3 is on Tuesday, May 6”

1. Ella-Lisa

Hello Professor Han, I am quite confused about questions #11 on page 402. I don’t know how to begin. HELP!!!!!!!!!!

2. Sandie Han Post author

P. 402 #11. Set H0=30, H1 is not equal 30. (This is a two-tail test)
Test statistic = (32.2-30)/(1.4/sqrt (40))=9.938587. Norm.s.dist(9.938587)=1. P-value=2*(1-1)=2*0=0. Since P-value < alpha, we reject H0.

3. Francois

Can you do numbef 12 too?

1. Sandie Han Post author

P. 402 #12. Set H0=16.2, H1 is not equal 16.2. (This is a two-tail test)
Test statistic = (32-16.2)/(4.7)=3.361702128. Norm.s.dist(3.361702128)=0.9996126818085
. P-value=2*(1-0.9996126818085)=2*0.0003873181915=0.000774636. If we let alpha=1%. P-value < alpha, we reject H0.

1. Francois

32 is not n?

1. Sandie Han Post author

In this case, 32 is possibly the new mean of the population living near a high-level electromagnetic field. Since it is normally distributed, use normal distribution to test the new mean. We are not considering sample mean in this problem. That is why we use s.d. = 4.7

4. Francois

Is section 9.4 on the exam?

1. Sandie Han Post author

t-distribution is not on tomorrow’s exam.