H0:20.3H0:20.3 H1:>20.3H1:>20.3 Your sample consists of 46 values, with a sample mean of 20.9. Suppose the population standard deviation is known to be 2.84. a) Calculate the value of the test statistic, rounded to 2 decimal places. z=z= b) At =0.08=0.08, the rejection region is

• z>1.41z>1.41
• z<-1.41orz>1.41z<-1.41orz>1.41
• z<-1.75z<-1.75
• z>1.75z>1.75
• z<-1.75orz>1.75z<-1.75orz>1.75
• z<-1.41z<-1.41

c) The decision is to

• Accept the alternative hypotheis
• Reject the null hypothesis
• Fail to reject the null hypothesis
• Accept the null hypothesis

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

• Type I
• Type I