Testing: H0:30.9H0:30.9 H1:>30.9H1:>30.9 Your sample consists of 44 values, with a sample mean of 31.5. Suppose the population standard deviation is known to be 1.3. a) Calculate the value of the test statistic, rounded to 2 decimal places. z=? b) At =0.03=0.03, the rejection region is

a. z <-1.88 or z>1.88

b. z <-1.88

c. z >2.17

d. z<-2.17 or z>2.17

e. z<-2.17

f. z>1.88z

c) The decision is to

1. Reject the null hypothesis

2. Accept the null hypothesis

3. Accept the alternative hypotheis

4. Fail to reject the null hypothesis

d) Suppose you mistakenly rejected the null hypothesis in this problem, what type of error is that?

• Type II
• Type I

Please help me understand this topic. to calculate the test statistic part is easier the rest i do not understand,

Thaank you