Use the Following to Answer the Question(s) Below

question 38

Multiple Choice

Use the following to answer the question(s) below.
A manufacturer of cordless electric shavers sampled 13 from a day's production and found the mean time of continuous usage without recharging to be 410 minutes with a sample standard deviation of 30 minutes. We can assume that times are normally distributed. We wish to test if the true mean operating time without recharging is more than 400 minutes.
-The correct null and alternative hypotheses are

• A) H0: µ = 400; HA: µ < 400.
• B) H0: µ = 400; HA: µ > 400.
• C) H0: µ > 400; HA: µ = 400.
• D) H0: µ < 400; HA: µ = 400.
• E) H0: µ = 400; HA: µ ≠ 400.

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Definitions:

Syllable

A unit of organization for a sequence of speech sounds, typically made up of a vowel sound with or without surrounding consonants, forming the whole or part of a word.

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The set of rules, principles, and processes that govern the structure of sentences in a given language, especially the arrangement of words and phrases.

Sound

Vibrations that travel through the air or another medium and can be heard when they reach a person's or animal's ear.

Syntax

The arrangement of words and phrases to create well-formed sentences in a language.