Question

​Claim: The standard deviation of pulse rates of adult males is less than 12 bpm. For a random sample of 175 adult​ males, the pulse rates have a standard deviation of 11.3 bpm. Complete parts​ (a) and​ (b) below.

a. Express the original claim in symbolic form.

b. Identify the null and alternative hypotheses.

Answer 1

Solution:

a)

Claim:

12 bpm

b)

This is a left (One) tailed test,

The null and alternative hypothesis is,  

Ho: 12 bpm

Ha: 12 bpm