A formal hypothesis test is to be conducted using the claim that the mean AC thermostat setting in restaurants is equal to 74° F. What is the null hypothesis and how is it denoted?
A) $H _ { 0 } : \mu = 74 ^ { \circ } \mathrm { F }$
B) $H _ { 0 } : \mu \neq 74 ^ { \circ } \mathrm { F }$
C) $H _ { 0 } : p = 74 ^ { \circ } \mathrm { F }$
D) $H _ { 0 } : p

Question

A formal hypothesis test is to be conducted using the claim that the mean AC thermostat setting in restaurants is equal to 74° F. What is the null hypothesis and how is it denoted? 
A) $H _ { 0 } : \mu = 74 ^ { \circ } \mathrm { F }$
B) $H _ { 0 } : \mu \neq 74 ^ { \circ } \mathrm { F }$
C) $H _ { 0 } : p = 74 ^ { \circ } \mathrm { F }$
D) $H _ { 0 } : p < 74 ^ { \circ } \mathrm { F }$

Quizplus · Accepted Answer

The null hypothesis is a statement that there is no effect or no difference, and it is usually the hypothesis that researchers try to disprove. In this case, the null hypothesis is that the mean AC thermostat setting in restaurants is equal to 74° F, which is correctly denoted as $H _ { 0 } : \mu = 74 ^ { \circ } \mathrm { F }$.

A Formal Hypothesis Test Is to Be Conducted Using the Claim