In the Past, the Mean Running Time for a Certain $$\begin{array} { l } \mathrm { H } _ { 0 } : \mu = 8.0 \text { hours } \\\mathrm { H } _ { \mathrm { a } } : \mu > 8.0 \text { hours }\end{array}$$

question 12

Multiple Choice

In the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis
Test to determine whether the mean running time has increased as a result. The hypotheses are: $$\begin{array} { l } \mathrm { H } _ { 0 } : \mu = 8.0 \text { hours } \\\mathrm { H } _ { \mathrm { a } } : \mu > 8.0 \text { hours }\end{array}$$
Explain the meaning of a Type II error.

• A) Concluding that \(\mu > 8.0\) hours when in fact \(\mu > 8.0\) hours
• B) Failing to reject the hypothesis that \(\mu = 8.0\) hours when in fact \(\mu > 8.0\) hours
• C) Concluding that \(\mu > 8.0\) hours
• D) Failing to reject the hypothesis that \(\mu = 8.0\) hours when in fact \(\mu = 8.0\) hours 110

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Definitions:

Pterygoid

Refers to muscles in the jaw area that are involved in jaw movements, including chewing and speaking.

Hyoglossus

A muscle in the tongue that depresses and retracts the tongue to assist in swallowing.

Orbicularis Oris

The circular muscle around the mouth that controls the movements of the mouth and lips.

Masseter

A facial muscle that plays a major role in the chewing of solid foods.