The Mean Length of a Small Counter Balance Bar Is

question 7

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.
• D) None of these statements are true

---

Definitions:

Major Divisions

The primary sections or chapters into which a document or report is organized, outlining its main parts.

Report Reader

An individual who reviews and interprets the contents of a report to understand the information or findings presented.

Alphabetical Guide

A reference tool or system that organizes information or items based on the letters of the alphabet for easy location and access.

Content Outlines

A structured framework that details the main headings and subheadings of a piece of writing or presentation content.