PSYC 510
H -OMEWORK: S SZ TESTS AND INGLE AMPLE T TESTS ASSIGNMENT
INSTRUCTIONS
OVERVIEW
This is designed to assess your Homework: Z-Tests & Single Sample T-Tests Assignment
understanding of the concepts and applications covered thus far in this course. This module
introduces two inferential tests – the test and single sample test; both of which are used to z t
determine whether a sample differs from a population. These tests are commonly used in
psychology, education, business, and other fields. This Homework: Z-Tests & Single Sample
T-Tests Assignment assesses your knowledge, skills, applications, and presentation of these
tests using professional conventions.
INSTRUCTIONS
Be sure you have reviewed this module’s before completing this Learn section Homework: Z-
Tests & Single Sample T-Tests Assignment Homework: Z-Tests & Single Sample T-. This
Tests Assignment is worth 60 points. Each question is worth 3 points. Six points are awarded
for mechanics/structure.
Part I contains general concepts from this module’s . Learn section
Part II requires use of SPSS. You will have to take screen shots and/or copy and paste from
your SPSS to place answers within this file. Make sure you only insert relevant and legible
images.
Part III is the cumulative section. These may include short answer and/or use of SPSS but
will review material from previous module(s).
Directions for each subsection are provided in the top of each table (in the blue shaded
areas).
Answers should be placed where indicated (wherever there is “ ”). ANSWER
Submit the file as a WORD document (.doc or .docx). Make sure the filename of your
submission includes your full name, course and section.
oExample: HW6_JohnDoe_510B01
Make sure to check the before beginning this Homework Grading Rubric Homework: Z-Tests
& Single Sample T-Tests Assignment.
Part I: General Concepts
These questions are based on the concepts covered in this module’s
assigned readings and presentations.
Answer the following questions using your own words.
1. What is the critical value for a one-tailed test? For a two-tailed test? Which is more likely to result in a z z
rejection of the null hypothesis? Why?
The critical value for a one-tailed test is ± 1.645.z
The critical value for a two-tailed test is ± 1.96z
In case of a one-tailed test, likelihood of resulting in a rejection of the null hypothesis is higher because the z value
that has been obtained does not have to be as far away from the mean of the population. In other words, it does not
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PSYC 510
have to be significantly different from the population mean.
2. Why does Change when the sample size changes? What must be computed to determine tcv. tcv.?
tcv. changes when the sample size changes as the distribution for every sample size is different. It results in the
alteration of the critical value that indicates the rejoining of rejection for the samples with diverse sizes. In order to
determine the ., the estimated standard deviation relating to the mean, the unbiased estimator of the standard tcv
deviation of the population and the degree of freedom have to be computed.
3. Henry performed a two-tailed test for an experiment in which = 24. He could not find his table of N t
critical values, but he remembered the at df = 13. He decided to compare his with this . Is he tcv tobt tcv
more likely to make a Type I or a type II error in this situation? Briefly discuss why.
In the specific situation, Henry is likely to make a Type II error. The error is likely to take place because he has
increased the level of risk of omitting a difference that is actually three.
Given a population standard deviation of 12, answer the following two questions.
