6.5.4

According to the WHO MONICA Project the mean blood pressure for people in China is 128 mmHg with a standard deviation of 23 mmHg(Kuulasmaa, Hense & Tolonen, 1998).Blood pressure is normally distributed.

a.)State the random variable. x = blood pressure for the people in China

b.)Suppose a sample of size 15 is taken.State the shape of the distribution of the sample mean. It would be a normal distribution

c.)Suppose a sample of size 15 is taken.State the mean of the sample mean.

d.)Suppose a sample of size 15 is taken.State the standard deviation of the sample mean.

e.)Suppose a sample of size 15 is taken.Find the probability that the sample mean blood pressure is more than 135 mmHg.

f.)Would it be unusual to find a sample mean of 15 people in China of more than 135 mmHg?Why or why not?

g.)If you did find a sample mean for 15 people in China to be more than 135 mmHg, what might you conclude?