Using the z-distribution, the estimate for how much the drug will lower a typical patient's systolic blood pressure is:
<h3>What is a z-distribution confidence interval?</h3>
The confidence interval is:
In which:
- is the sample mean.
- is the standard deviation for the population.
In this problem, we have a 80% confidence level, hence, z is the value of Z that has a p-value of , so the critical value is z = 1.28.
The other parameters are given by:
Then the bounds of the interval are:
Hence the interval is:
More can be learned about the z-distribution at brainly.com/question/25890103
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The answer is here in the picture
Answer:
A, slope
I am pretty sure it is the slope