ITS LIKE ALIEN LANGUAGE HELP PLEASE

Question

The effectiveness of a blood-pressure drug is being investigated. An experimenter finds that, on average, the reduction in systolic blood pressure is 50.5 for a sample of size 735 and standard deviation 21.6.

Estimate how much the drug will lower a typical patient's systolic blood pressure (using a 95% confidence level).

Enter your answer as a tri-linear inequality accurate to one decimal place (because the sample statistics are reported accurate to one decimal place).

________ < <  _________



Answer should be obtained without any preliminary rounding.

Answer 1

CI is:

mean +/- critical z value * standard deviation/square root(sample size)

the mean is given as 50.5, the standard deviation is given as 21.6 and the sample size is given as 735.

the critical z-value for a 95% Ci is 1.96.

so CI is

21.6 - 1.96 * 21.6/sqrt(735) < mu < 21.6 + 1.96 * 21.6/sqrt(735)

I will leave it to you to complete the computations.