A Design Engineer Wants to Construct a Sample Mean Chart

question 75

Multiple Choice

A design engineer wants to construct a sample mean chart for controlling the service life of a halogen headlamp his company produces. He knows from numerous previous samples that this service life is normally distributed with a mean of 500 hours and a standard deviation of 20 hours. On three recent production batches, he tested service life on random samples of four headlamps, with these results: $$\begin{array} { c c c c c } \text { Sample } && { \text { Service Life (hours) } } \\\hline 1 & 495 & 500 & 505 & 500 \\2 & 525 & 515 & 505 & 515 \\3 & 470 & 480 & 460 & 470\end{array}$$
What is the standard deviation of the sampling distribution of sample means for whenever service life is in control?

• A) 5 hours
• B) 6.67 hours
• C) 10 hours
• D) 11.55 hours
• E) 20 hours

Differentiate between cross-sectional and longitudinal methods and their implications for research findings.

Explain the significance of the correlation coefficient and the strength and direction of relationships.

Understand the concept of statistical significance and its implications on the reliability of experimental results.

Comprehend how statistical significance affects the interpretation of differences between sample groups.

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Definitions:

External Noise

Distractions that originate outside the communicator that can interfere with the transmission of a message, affecting its reception and understanding.

Effective Listening

The active process of attentively receiving, interpreting, and responding to verbal and non-verbal messages.

Communication Relationship

The connection between individuals that is established and maintained through the exchange of messages and information.

Accurate Understanding

The correct comprehension or interpretation of a message or situation, reflecting an effective communication process.