In a population of over 15,000 patients, the distribution of systolic blood pressure follows the normal curve. Investigators believe the average systolic blood pressure in the population is 120 mm. The investigators take a simple random sample of 6 patients from this population. The systolic blood pressure measurements of these patients have an average of 113.5 mm and an SD (computed with 6 in the denominator) of 12.2 mm. Is the average systolic blood pressure in the population lower than the investigators think? Or is this just chance variation?

Question

PROBLEM 9
The null hypothesis is:

The average blood pressure in the population is 120 mm.
The average blood pressure in the population is less than 120 mm.
The average blood pressure in the population is not equal to 120 mm.

PROBLEM 10
The approximate distribution of the test statistic is (pick the best option)
binomial
hypergeometric
normal t
chi-square


PROBLEM 11
The test is
one-tailed
two-tailed

PROBLEM 12
The P-value of the test is approximately _______%

PROBLEM 13
“The test supports what the investigators think.”
The quoted statement is
True
False

Answer 1

9 1
10 4
11 1
13 1

Answer 2

Help, thank you very much