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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Complete Question
The complete question is shown on the first uploaded image
Answer:
Value x of X -3 -7 -15
Step-by-step explanation:
From the question we are told that
The values of X are
The total number of outcomes is n = 8
The probability distribution function of X is evaluated as follow
Where is the number of time X = -3 occurred and from the table the value is
Therefore
Now
Where from table
So
Also
From the equilateral (60-60-60) triangle with all legs of length 1, we can view half the triangle, forming a 30-60-90 triangle, with the hypotenuse measuring 1, the short leg1/2<span>, and the long leg 3 2. Therefore, we have sin 30° = </span>1/2<span>, cos 30° = 3 2, sin 60° = 3 2 and cos 60° = </span>1/2<span>.
i hope this help</span>
Answer:
2n=10
Step-by-step explanation:
Distribute the 2 to each term. 2xn=2n and 2x5=10. then you put them together.
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