SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 14) The mean age of bus drivers In Chicago is 56.9 years. State this claim mathematically. 14) Write the null and alternative hypotheses. Identify which hypothesis is the claim. 15) Find the sample standard deviation and variance. 15) 22 29 21 24 27 28 25 36 16) The statement represents a claim. Write Its complement and state which Is Ho and which Is 16) HA The standard deviation in the age that students get vaccinated is less than 9.9 years old