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A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% A's, 26% B's, 31% C's, 19% D's, and 10% F's. A sample of n = 200 psychology students from last semester produced the following grade distribution: A 32% 11% 14% 31% 12% Do the data indicate a significant change in the grade distribution? Test at the .05 level of significance. Use Chi-square.

A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% A's, 26% B's, 31% C's, 19% D's, and 10% F's. A sample of n = 200 psychology students from last semester produced the following grade distribution: A 32% 11% 14% 31% 12% Do the data indicate a significant change in the grade distribution? Test at the .05 level of significance. Use Chi-square.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter11: Data Analysis And Probability
Section: Chapter Questions
Problem 8CR
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Do the data indicate a significant change in grade distribution? Test at the .05 level of significance. Use Chi-square 

12% O Mon 9:32 PM Bookmarks People Tab Window Help Chrome File Edit View History B Take Test: Week # 12 assignm S A Not Secure bb.wpunj.edu webapps/assessment/take/launch.jsp?course assessment id%= 92221 1&course id= 129468 1&content id= 2567819 1&step=null QUESTION 1 Formulas for Chi-square: (fobserved Jerpected) feepected - theoretical frequency x² = = where fobserved – frequency that is observed in the experiment3; feapected Effect size for Chi-square (if you have 2x2 contingency table) : Vi where x is Chi – square calculated for the sample; N- number of observations in the sample A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% A's, 26% B's, 31% C's, 19% D's, and 10% F's. A sample of n = 200 psychology students from last semester produced the following grade distribution: %3D A D. 32% 11% 14% 31% 12% Do the data indicate a significant change in the grade distribution? Test at the.05 level of significance. Use Chi-square. 3 NOV
Transcribed Image Text:12% O Mon 9:32 PM Bookmarks People Tab Window Help Chrome File Edit View History B Take Test: Week # 12 assignm S A Not Secure bb.wpunj.edu webapps/assessment/take/launch.jsp?course assessment id%= 92221 1&course id= 129468 1&content id= 2567819 1&step=null QUESTION 1 Formulas for Chi-square: (fobserved Jerpected) feepected - theoretical frequency x² = = where fobserved – frequency that is observed in the experiment3; feapected Effect size for Chi-square (if you have 2x2 contingency table) : Vi where x is Chi – square calculated for the sample; N- number of observations in the sample A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years. It is known that the overall grade distribution for the department in 1985 had 14% A's, 26% B's, 31% C's, 19% D's, and 10% F's. A sample of n = 200 psychology students from last semester produced the following grade distribution: %3D A D. 32% 11% 14% 31% 12% Do the data indicate a significant change in the grade distribution? Test at the.05 level of significance. Use Chi-square. 3 NOV
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