The Mean Length of a Small Counter Balance Bar Is

question 118

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 rejection region.
• 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.
• D)Yes,because 43 is greater than 41.5.

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Definitions:

Oceangoing Vessel

A ship designed and equipped to travel across oceans.

Merchant's Firm Offer

A legal concept in commercial law where a merchant offers to sell goods in a written and signed promise that the offer will remain open and cannot be revoked for a certain period of time.

Lease

A contractual agreement by which one party conveys property, land, or services to another for a specified time, usually in return for a periodic payment.

Reasonable Price

A price that is fair and acceptable based on the context of the market, product, or service being provided.