Homework: Tests and Single Sample t tests Assignment Instructions
Overview
This Homework: ZTests & Single Sample TTests Assignment is designed to assess your understanding of the concepts and applications covered thus far in this course. This module introduces two inferential tests – the z test and single sample t test; both of which are used to determine whether a sample differs from a population. These tests are commonly used in psychology, education, business, and other fields. This Homework: ZTests & Single Sample TTests Assignment assesses your knowledge, skills, applications, and presentation of these tests using professional conventions.
Instructions
Be sure you have reviewed this module’s Learn section before completing this Homework: ZTests & Single Sample TTests Assignment. This Homework: ZTests & Single Sample TTests 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.
o Example: HW6_JohnDoe_510B01
Make sure to check the Homework Grading Rubric before beginning this Homework: ZTests & Single Sample TTests Assignment.

Part I: General Concepts These 

Answer the


1. 
What is the critical value for a onetailed z test? For a twotailed z test? Which is more likely to result in a rejection of the null 
ANSWER


2. 
Why does t_{cv}. Change when 
ANSWER


3. 
Henry performed a 
ANSWER

Given a population standard deviation of 12, answer the following two 

4) Calculate the standard error of the mean (σX)
given the following two sample sizes (show N_{1} = 20 N_{2} = 70 
WORK: N_{1} = N_{2} = 
ANSWER N_{1} = N_{2} = 
5) How does the 
ANSWER 
Calculate the critical degrees of freedom and identify the critical values 

6) Single sample ttest: 
df= ANSWER 
critical t = ANSWER 
Reject or Fail to Reject ANSWER 
7) Single sample ttest: onetailed, N 
df= ANSWER 
critical t = ANSWER 
Reject or Fail to Reject ANSWER 
8) Pearson’s r correlation: 
df= ANSWER 
critical r = ANSWER 
Reject or Fail to Reject ANSWER 
9) Pearson’s r correlation: 
df= ANSWER 
critical r = ANSWER 
Reject or Fail to Reject ANSWER 
A company decides


10) Calculate 
ANSWER 
11) Conduct the What is the z_{obt} score? 
ANSWER 
12) Write your 
ANSWER 

Part II: SPSS These



Exercise 1
Spatial ability was


13) 
Run descriptive 

ANSWER SPSS output


14) 
You want to compare 

ANSWER: SPSS output


15) 
Write a results All homework 

ANSWER


Part III: Cumulative These


A recruiter wants to know if college GPA is truly
Remember – prediction requires a different analysis than


16) Paste appropriate SPSS output.


ANSWER


17) Paste appropriate SPSS graph. 

ANSWER


18) Write a Results section in current APA


ANSWER

Submit this assignment by 11:59 p.m. (ET) on Sunday of Module 6. Remember to name the file appropriately.