A doctor believes that the average age of single mothers is 20 years. A random sample of 10 single mothers was drawn from a Obstetrics Clinic.

A doctor believes that the average age of single mothers is 20 years. A random sample of 10 single mothers was drawn from a Obstetrics Clinic. Their ages are 22, 17, 27, 20, 23, 19, 24, 18, 19, and 24 years.

In a test to determine if we can infer at the 5% significance level that the population mean is not equal to 20, what is the research or alternative hypothesis?

(d) H m = 20

(c) H μ <>

(b) H m <>

 (a) H μ