Find the Margin of Error $\begin{array} { l l l l l l } 77.9 & 89.1 & 80.7 & 78.6 & 74.4 & 82.0 \end{array}$

question 64

Multiple Choice

Find the margin of error.
-The principal randomly selected six students to take an aptitude test. Their scores were: $\begin{array} { l l l l l l } 77.9 & 89.1 & 80.7 & 78.6 & 74.4 & 82.0 \end{array}$
Determine a 90 percent confidence interval for the mean score for all students.

• A) \(84.54 < \mu < 76.36\)
• B) \(84.64 < \mu < 76.26\)
• C) \(76.36 < \mu < 84.54\)
• D) \(76.26 < \mu < 84.64\)

Distinguish between different types of punctuation used in business letters.

Recognize different letter styles and their applications in business communication.

Understand the significance of a well-structured content in business letters.

Identify common errors in letter preparation and know how to avoid them.

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