Random Samples of 4 Items Are Selected from a Manufacturing $\Sigma$

question 20

Multiple Choice

Random samples of 4 items are selected from a manufacturing process at regular intervals and a certain quality characteristic is measured. After 25 samples, $\Sigma$ X = 15,350 and $\Sigma$ R = 411.4
What is the sample size?

• A) 4
• B) 25
• C) 100
• D) 20

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Definitions:

Alpha

In statistics, alpha represents the level of significance, the probability of rejecting the null hypothesis when it is actually true, commonly set at 0.05 or 5%.

Beta

In statistics, it often refers to the probability of making a Type II error, or in finance, a measure of how much a stock's price could move in relation to the market.

Type II Error

A statistical error that occurs when a false null hypothesis is not rejected, implying that a true effect is missed.

Type I Error

A mistake wherein a true null hypothesis is incorrectly rejected, commonly termed as a "false positive."