An actuary wants to prove that the unofficial drinking age is younger than 21. it is assumed the age is normally distributed with a known population standard deviation of 5. let there be a sample of 25 millennials with an average drinking age of 17. the significance level should be strong because the actuary wants to use this test to show that 21 is not necessarily the most dangerous year to drive.
1. describe the null and alternative hypotheses.
2. choose a significance level that makes sense to you and conduct the test statistic.
3. interpret your results.

We reject the null hypothesis.

Step-by-step explanation:

Since we have given that

We claim that unofficial drinking age is younger than 21.

So, our hypothesis would be

Null hypothesis :

Alternate hypothesis :

Test statistic would be

According to question, p-value = 0

As p- value is less than 0.05 level of significance.

So, we reject the null hypothesis.

answer

d. 10

explanation

the distance from point y to wx is the height of the triangle.

using pythagoras theorem,

group similar terms to get,

this implies that,

take positive square root of both sides to get,

this implies that,