Question

Your medical research team is investigating the standard deviation of the cost of a 30-day-supply of a certain heart medication. A pharmaceutical company thinks that the standard deviation of the cost is less than $23. You want to support this claim. How would you write the null and alternative hypothesis?

Answer 1

Considering the situation described, the hypothesis tested are given as follows:

• The null hypothesis is $H_0: \sigma \geq 23$

• The alternative hypothesis is $H_1: \sigma < 23$

What are the hypothesis tested?

At the null hypothesis, it is tested if the standard deviation is not less than $23, that is:

$H_0: \sigma \geq 23$

At the alternative hypothesis, it is tested if there is significant evidence t conclude that the standard deviation is less than $23, that is:

$H_1: \sigma < 23$

More can be learned about an hypothesis test at https://brainly.com/question/26454209