The Breaking Strength of Yarn Used in the Manufacture of Woven

question 12

Multiple Choice

The breaking strength of yarn used in the manufacture of woven carpet material is Normally distributed with  = 2.4 psi.A random sample of 16 specimens of yarn from a production run was measured for breaking strength,and based on the mean of the sample ,a confidence interval was found to be (128.7,131.3) .If we wanted to have a greater degree of confidence in the calculated interval,what would have to happen to its length?

• A)The interval would be shorter.
• B)The margin of error would decrease.
• C)The confidence level would have a smaller value.
• D)The sample size would go up.
• E)The interval would increase in length.

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Definitions:

Blinding

A method in experimental design that prevents participants, experimenters, or both from knowing which intervention participants are receiving to reduce bias.

Average Prices

The mean amount of money required to purchase a particular set of goods or services.

Supermarket Chains

Companies that own or operate multiple supermarket stores across different locations.

Blocking Variable

A variable introduced in an experimental design to account for potential variation, thereby reducing confounding effects.