Answer:
a
The correct option is B
b
The correct option is D
Step-by-step explanation:
From the question we are told that
The level of significance is
The p-value is
Considering question b
Given that the then the null hypothesis is rejected
Considering question b
Given that the original claim is The standard deviation of pulse rates of a certain group of adult males is more than 11 bpm
Then the null hypothesis is
The reason why the null hypothesis is write like this above is because a null hypothesis expression can not contain only a > or a < but only allows =
and the alternative hypothesis is
Now given that the null hypothesis is rejected, it mean that there is sufficient evidence to support original claim