Psych 218
INSTRUCTIONS: This assignment focuses on regression. You should review Chapter 4 of "A Student Guide to SPSS" before trying to complete this assignment. Use the SPSS file 'Lab-Assignment-3-Data' to complete the assignment. This file can also be found in the folder called 'Lab Assignment 3' on vista. The SPSS file contains data from the online survey and the CogLab "Memory Span" experiment your class completed.
Marking of lab assignments will be very strict. If you did not complete the CogLab "Memory Span" experiment on time, you will lose 1/4 of the total assignment grade (6 points). To avoid receiving other deductions, type your answers in the spaces provided. You may insert additional spaces after any question as needed. In addition, use proper symbols and notation (e.g., sY/X, r, R) in all your answers. Properly round your final answers to 2 decimal places, with the following exception: Round regression line slopes (coefficients) and Y-intercepts (constants) to 3 decimal places. You will lose marks for each and every failure to follow these directions.
This lab assignment is due at the beginning of class on Tuesday February 14, but you have an automatic extension until the beginning of class on Thursday February 16. You must print out your completed assignment and attach (using a staple) any relevant SPSS output. Do not email your assignment. You will lose 1/8 of the total assignment grade (3 points) for each day it is late. An assignment will be considered one day late as soon as the lecture begins on Thursday February 16.
1. Perform a simple regression analysis using the frequency with which students took notes ('notes') to predict their mean grade ('meangrade'). [8 points]
a. Report the correlation between 'notes' and 'meangrade'. (1 point) r = 0.39
b. Provide a precise interpretation of the value of R squared given in the Output window. (1 point) The coefficient of determination (r2) is 0.15. 0.1553 x 100% =
Marking of lab assignments will be very strict. If you did not complete the CogLab "Memory Span" experiment on time, you will lose 1/4 of the total assignment grade (6 points). To avoid receiving other deductions, type your answers in the spaces provided. You may insert additional spaces after any question as needed. In addition, use proper symbols and notation (e.g., sY/X, r, R) in all your answers. Properly round your final answers to 2 decimal places, with the following exception: Round regression line slopes (coefficients) and Y-intercepts (constants) to 3 decimal places. You will lose marks for each and every failure to follow these directions.
This lab assignment is due at the beginning of class on Tuesday February 14, but you have an automatic extension until the beginning of class on Thursday February 16. You must print out your completed assignment and attach (using a staple) any relevant SPSS output. Do not email your assignment. You will lose 1/8 of the total assignment grade (3 points) for each day it is late. An assignment will be considered one day late as soon as the lecture begins on Thursday February 16.
1. Perform a simple regression analysis using the frequency with which students took notes ('notes') to predict their mean grade ('meangrade'). [8 points]
a. Report the correlation between 'notes' and 'meangrade'. (1 point) r = 0.39
b. Provide a precise interpretation of the value of R squared given in the Output window. (1 point) The coefficient of determination (r2) is 0.15. 0.1553 x 100% =