The Mean Length of a Small Counter Balance Bar Is

question 97

Multiple Choice

The mean length of a small counter balance bar is 43 millimeters. There is concern that the
Adjustments of the machine producing the bars have changed. Test the claim at the 0.02 level that
There has been no change in the mean length. The alternate hypothesis is that there has been a
Change. Twelve bars (n = 12) were selected at random and their lengths recorded. The lengths are
(in millimeters) 42, 39, 42, 45, 43, 40, 39, 41, 40, 42, 43 and 42. The mean of the sample is 41.5 and
The standard deviation 1.784. Computed t = -2.913. Has there been a statistically significant change
In the mean length of the bars?

• A) Yes, because the computed t lies in the area beyond the critical.
• B) No, because the information given is not complete.
• C) No, because the computed t lies in the area to the right of -2.718.

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Definitions:

Symbolic Immortality

The concept of achieving a sense of perpetuity beyond one's death through contributions to society, remembrance by others, or through creations or offspring.

Near-Death Experience

A profound psychological event that may occur to a person close to death or in situations of intense physical or emotional pain, often characterized by visions and a sense of detachment from the body.

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Subject to or indicative of frequent changes in mood or temperament.

Near-Death Experiences

Unusual experiential phenomena reported by people who have been close to death, often characterized by visions, out-of-body sensations, and feelings of peace.