Education Technology

Statistics: Estimating a Population Proportion
by Texas Instruments

Updated on February 10, 2015


Students find the confidence interval for a population proportion by first finding the critical value and the margin of error.

Key Steps

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    In Problem 1, students are to find the critical value, the margin of error, and the intervals at both the 95% and 99% level. Critical values are found by using the invNorm command to find the area to the left of that value.

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    Students can then use their handheld to compute the Confidence Interval without finding critical value and margin of error. They will be able to check their work using the 1-Prop z Interval command.

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    Encourage students to summarize what they have learned from completing the activity. If desired, discuss the extension with students.