In Order to Estimate the Average Daily Down Time,a Manufacturer

question 23

Multiple Choice

In order to estimate the average daily down time,a manufacturer randomly sampled 41 days of production records and found a mean of 51.75 minutes and standard deviation of 7.9 minutes.A 90% confidence interval for the population mean is:

• A)51.75 ± 4.76
• B)51.75 ± 3.28
• C)51.75 ± 2.08
• D)51.75 ± 1.30

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Definitions:

Decibels

A unit of measurement for the intensity of sound, indicating the pressure level of sound waves.

Hertz

The unit of frequency in the International System of Units (SI), representing one cycle per second, used to measure wave frequencies such as sound waves or brainwaves.

Monocular Cue

Visual information that provides depth perception from a single eye by using cues of linear perspective, texture gradient, and motion parallax.

Perspective

A monocular cue for depth based on the convergence (coming together) of parallel lines as they recede into the distance.