Module 21 – Estimating a Population Mean Lab

Description

Progress Check

Use this activity to assess whether you and your peers can:

Use StatCrunch to find a one-sample T-interval to estimate a population mean.

Interpret a confidence interval in context.

Use a confidence interval to find the margin of error (MOE).
Identify which of the two confidence intervals is more accurate.
Identify which of the two confidence intervals is more precise.
Data
All directions in this assignment open in a new tab.

Open your IAT sample data set in StatCrunch (directions).

Variables

Gender-Career IAT Variables

Gender-Career IAT variable descriptions (opens in a new tab).

Gender-Science IAT Variables

Gender-Science IAT variable descriptions (opens in a new tab).

Race IAT Variables

Race IAT variable descriptions (opens in a new tab).

Sexuality IAT Variables

Sexuality IAT variable descriptions (opens in a new tab).

Weapons IAT Variables

Weapons IAT variable descriptions (opens in a new tab).

Weight IAT Variables

Weight IAT variable descriptions (opens in a new tab).

Prompt

You are tasked with using StatCrunch and your unique IAT sample to estimate the population mean for your IAT-Score variable.

Question 1

Use StatCrunch and your unique IAT sample to estimate the mean IAT-Score for the population of IAT participants at the 80% confidence level (directions). Copy the contents of your StatCrunch output window and paste it into your response.

Identify the 80% confidence interval.

Interpret your confidence interval in context.

Can we use the StatCrunch output to find the margin of error (MOE)? If so, what is the MOE? If not, identify the missing information.

Question 2

Use StatCrunch and your unique IAT sample to estimate the mean IAT-Score for the population of IAT participants at the 95% confidence level (directions). Copy the contents of your StatCrunch output window and paste it into your response.

Identify the 95% confidence interval.

Interpret your confidence interval in context.

Can we use the StatCrunch output to find the margin of error (MOE)? If so, what is the MOE? If not, identify the missing information.

Question 3

Which of the two confidence intervals is more accurate? Briefly explain.

Which of the two confidence intervals is more precise? Briefly explain.

StatCrunch Directions

Here is a PDF document with all StatCrunch directions (Links to an external site.) (opens in a new tab).

Module 21 Discussion Board

Use the Module 21 discussion board (opens in a new tab) to ask questions or provide feedback about the problems in any Module 21 activity – including this peer-reviewed assignment.

Review Feedback

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