Use the Following to Answer the Question(s) Below

question 36

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 value of the test statistic is

• A) 1.20.
• B) -0.333.
• C) -2.52.
• D) -1.20.
• E) 2.79.

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Definitions:

Culture Fair

A term used to describe tests or assessments designed to be free from cultural biases, aiming to measure cognitive abilities or intelligence universally.

Culture Free

A concept pertaining to tests or measurements that are designed to be uninfluenced by cultural biases or norms.

Common

Occurring often or widely accepted; prevalent or usual.

General

Refers to something that applies broadly or commonly, without being restricted to specifics or details.