A Machine Cuts Steel to Length for Nails

question 21

Short Answer

A machine cuts steel to length for nails. The mean length of a nail is 43 millimeters. There is concern that the settings of the machine producing the nails have changed. To test the claim, twelve nails (n = 12) were sampled. The mean of the sample is 41.5 and the standard deviation is 1.784. To test the claim at the 0.02 significance level, what is the critical value?

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Definitions:

Infants

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Privacy

The right of individuals to keep their personal matters and relationships secret or protected from the intrusion of others.

Interrupts

Acts or instances that cause a temporary cessation or disruption of an ongoing activity or process.

Psychosexual Maturity

The stage of psychological development at which a person's sexual instincts are integrated and maturely expressed.