Your Statistics Instructor Wants You to Determine a Confidence Interval

question 112

Multiple Choice

Your statistics instructor wants you to determine a confidence interval estimate for the mean test score for the next exam.In the past,the test scores have been normally distributed with a mean of 74.2 and a standard deviation of 30.9.A 95% confidence interval estimate if your class has 30 students is:

• A) 68.72 to 79.68.
• B) 13.64 to 134.76.
• C) 64.92 to 83.48.
• D) 62.66 to 85.73.
• E) 63.14 to 85.26.

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Definitions:

Supporting Evidence

Information or data that backs up or justifies a statement, theory, or finding, adding credibility to it.

Text Language

The specific language and abbreviations used in text messaging and online communication to convey messages quickly and with limited character use.

Vocal Pitch

The perceived frequency of a speaker's voice, which can affect the interpretation and emotional tone of the message.

Voicemail

A system that records messages from callers when the recipient is unavailable to answer the phone.