A student at a large university suspects Mr. Harsh is grading his statistics students too harshly. The student determines that over the past 2 years students in all sections of statistics (taught by other teachers) received grades of A, B, C, D, or F in the following proportions: A: 0.20; B: 0.30; C: 0.30; D: 0.10; and F: 0.10. The student then takes an SRS of 90 students who took statistics with Mr. Harsh in the past 2 years and gathers the following information: Grade Number of students B 26 12 28 15 The student performs the appropriate y2 procedure to test the hypothesis that the teacher's grade distribution is different from the other teachers Which of the following expressions represents the expected count of the grade category D? O (0.10)(90) O 1s? 90 (15-9) O (0.10)(15)
A student at a large university suspects Mr. Harsh is grading his statistics students too harshly. The student determines that over the past 2 years students in all sections of statistics (taught by other teachers) received grades of A, B, C, D, or F in the following proportions: A: 0.20; B: 0.30; C: 0.30; D: 0.10; and F: 0.10. The student then takes an SRS of 90 students who took statistics with Mr. Harsh in the past 2 years and gathers the following information: Grade Number of students B 26 12 28 15 The student performs the appropriate y2 procedure to test the hypothesis that the teacher's grade distribution is different from the other teachers Which of the following expressions represents the expected count of the grade category D? O (0.10)(90) O 1s? 90 (15-9) O (0.10)(15)
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.4: Distributions Of Data
Problem 19PFA
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Transcribed Image Text:A student at a large university suspects Mr. Harsh is grading his statistics students too harshly. The student determines that over the past 2 years students in all
sections of statistics (taught by other teachers) received grades of A, B, C, D, or F in the following proportions: A: 0.20; B: 0.30; C: 0.30; D: 0.10; and F: 0.10. The
student then takes an SRS of 90 students who took statistics with Mr. Harsh in the past 2 years and gathers the following information:
Grade
Number of students
B
26
12
28
15
The student performs the appropriate x procedure to test the hypothesis that the teacher's grade distribution is different from the other teachers, Which of the
following expressions represents the expected count of the grade category D?
O (0.10)(90)
O 15?
90
(15-9)
O (0.10)(15)
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