Project 8
Description
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In this project, we’ll use our unique IAT random samples to demonstrate what we learned in Unit 4 (Module 11).
WARNING: Since this project is equivalent to an exam, I will not be able to help you. However, you can still rely on your classmates for help, and I can answer clarification questions.
Progress Check
Use this activity to assess whether you can:
 Determine when to use a hypothesis test or a confidence interval to draw a conclusion about a population mean.
 Construct a confidence interval to estimate a population mean when conditions are met.
 Under appropriate conditions, conduct a hypothesis test about a population mean and state the conclusion in context.
 Under appropriate conditions, conduct a hypothesis test about a difference between two population means and state a conclusion in context.
Directions
WARNING: The directions for Unit Projects differ from the directions for homework and lab assignments.
Use the dropdown menu to learn about the four steps needed to complete this assignment.
Four steps to complete the assignment
Data
From this point forward, all links in this assignment open in a new tab.
 Login and open StatCrunch (directions).
 Open your IAT sample data set in StatCrunch (directions).
Prompt
Question 1

 Which IAT data set are you working with?
 Use StatCrunch and your unique IAT sample to estimate the mean age for the population of IAT participants at the 90% confidence level. Copy the contents of your StatCrunch output window and paste them into your response. (No need to type anything here – just copy and paste the contents of your StatCrunch output window.)
 Are conditions met to estimate the mean age for the population of IAT participants? (Be sure to support your answer as demonstrated throughout Unit 8.)
 State the confidence interval, and then interpret the confidence interval in context.
 What is the margin of error (MOE)?
 Which would be more accurate, the 90% confidence interval you found or an 85% confidence interval? Briefly explain. Which would be more precise? Briefly explain.
Question 2
At the end of 2020, the mean age of the U.S. population was estimated to be 38.5 years old. You are tasked with determining whether the mean age of the population of IAT participants (for your chosen IAT data set) differs from the mean age of the U.S. population.

 Let $\ufffd$be the mean age of the population of IAT participants for your chosen IAT data set. State the hypotheses (symbolically and in words). Include a clear description of the populations and the variable.
 Use StatCrunch to create a histogram for the age distribution in your unique IAT sample. Download the StatCrunch output window and embed your histogram with your response. Can we safely use the ttest with your IAT sample? Explain.
 Perform the ttest using StatCrunch. Copy the information from the StatCrunch output window and paste it into your response.
 Based on the Pvalue, state your conclusions in context. Use a 5% level of significance. (NOTE: Since StatCrunch correctly calculates the Pvalue for either a onetailed or a twotailed test, you do not need to change the StatCrunch Pvalue.)
 Using the context of this scenario, explain the meaning of each of the following items from the StatCrunch output for the hypothesis test.
Std. Err (standard error)
Tstat (Tscore)
Pvalue
Question 3
Below are the variables for Question 3. For all data sets, the categorical variable is the explanatory variable, and the quantitative variable is the response variable.
GenderCareer IAT Variables for Question 3 Only
Open for the GenderCareer variables
GenderScience IAT Variables for Question 3 Only
Open for the GenderScience variables
Race IAT Variables for Question 3 Only
Open for the Race variables
Sexuality IAT Variables for Question 3 Only
Open for the Sexuality variables
Weapons IAT Variables for Question 3 Only
Open for the Weapons variables
Weight IAT Variables for Question 3 Only
Open for the Weight variables
 Choose only one of the categorical variables listed for your IAT data set and note the two groups for your chosen categorical variable.
 Here is the question to be investigated for the two groups in your chosen categorical variable.
Do the population of IAT participants in one group score higher on the IAT test than the population of IAT participants in the other group?
To answer the question we are investigating, respond to each of the following

 Use StatCrunch to determine the sample size and sample mean, $\overline{\ufffd}$, for the two groups in your chosen categorical variable (directions).
 Copy your StatCrunch output table and paste it into your response. Then relabel the categorical variable groups with the appropriate word(s), i.e. replace the group numbers with the appropriate word(s) to describe the group (see the Categorical Variable section above for your data set).
 Use StatCrunch to determine the sample size and sample mean, $\overline{\ufffd}$, for the two groups in your chosen categorical variable (directions).


 Which of the two groups has the smallest sample mean? Which has the largest sample mean?
 Let ${\ufffd}_{1}$ be the population mean for the group with the largest sample mean. Let ${\ufffd}_{2}$ be the population mean for the group with the smallest sample mean. State the null and alternative hypotheses (symbolically and in words). Include a clear description of the populations and the variable.
 To test your hypotheses, is it appropriate to use the twosample Ttest? If so, explain why and provide any supporting evidence. If not, start over and choose the other categorical variable listed with your chosen IAT data set.
 WARNING: If it is not appropriate to use the twosample Ttest for either of the categorical variables listed with your IAT data set, something may be wrong. Stop and contact me as soon as possible.
 Proceed only if it is appropriate to use the twosample Ttest.
 Use StatCrunch to carry out the test (directions).
Copy the content in the StatCrunch output window (text and the table) and paste it into the textbox as your response to this item.  Use a 5% significance level to state a conclusion. Be sure to state your conclusion in context and in terms of what a “more positive score” on the IAT means for your data set. (Hint: in the variables section above, click on the variable descriptions link for your data set. The variable descriptions page opens in a new window. Review the Interpreting the IAT section at the top of that page.)

StatCrunch Directions
Here is a PDF document with all StatCrunch directionsLinks to an external site. (opens in a new tab).
Unit 8 Project Discussion Board
Use the Unit 8 Project discussion board (opens in a new tab) to ask questions or provide feedback about this project.My
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