Homework Answers
a) Number of students = 100
b) Students who fail = 14+14+36 = 64 = 64%
c) Percent with a grade better than 8 = 16/100= 16%
d) majority of sudents have grade between 4 to 6 , ie 36% students.
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Q12. The following frequency distribution and cumulative frequency distribution represent students grades in a quiz of...
Are grades higher on the second quiz? Here is a sample of grades from a large introductory statis...
Are grades higher on the second quiz? Here is a sample of grades
from a large introductory statistics course. We are interested in
testing whether the mean grade on the second quiz is higher than
the mean grade on the first quiz. You may assume any required test
assumptions have been met.
a) Complete the test if we assume that the grades from the first
quiz come from a random sample of 12 students in the course and the
grades...
The frequency distribution below indicates the numbers of students who earned grades (30s, 40s, etc.) on an exam If one...
The frequency distribution below indicates the numbers of students who earned grades (30s, 40s, etc.) on an exam If one of these students is randomly selected, what is the probability that he earned a grade that is NOT 59 or lower? Taly bars Class interval Frequency 30-39 2 40-49 3 50-59 11 60-69 20 70-79 32 HAI HA H 80-89 25 90-99 THI 7 N 100 Total 84/100 16/100 5/8 95/100
The frequency distribution below indicates the numbers of students...
Table 6.25 gives a sample of grades on the first two quizzes 1in an introductory statistics...
Table 6.25 gives a sample of grades on the first two quizzes 1in an introductory statistics course. We are interested in testing whether the mean grade grade TABLE 6.25Are grades higher on the second quiz? First Quiz on the second quiz is significantly higher than the on the first quiz mean 72 9556 87 80 98 74 85 77 62 Second Quiz 78 96 72 89 80 95 86 87 82 75 Complete the test if we assume that the...
2. Students often claim that the distribution of grades varies depending on the subject. From pas...
problem on chi-square test for homogeneity
2. Students often claim that the distribution of grades varies depending on the subject. From past records a university registrar chose random samples of grades from selected first year courses in English, Mathematics and Biology. Care was taken to exclude any student who may have taken two or more of these courses. The distribution of grades for each sample is given below. English Mathematics Biology 13 17 10 GRADEc42 15 24 (a) Test at...
The following scores represent the final examination grades for an elementary statistics course:
The following scores represent the final examination grades for an elementary statistics course: 23 60 79 32 57 74 52 70 82 36 80 77 81 95 41 65 92 85 55 76 52 10 64 75 78 25 80 98 81 67 41 71 83 54 64 72 88 62 74 43 60 78 89 76 84 48 84 90 15 79 34 67 17 82 69 74 63 80 85 61 Calculate: Stem and leaf Relative frequency histogram Cumulative frequency Sample Mean Sample Median Mode Variance Standard deviation
A study is given to college students to determine the semester grades. The results are given...
A study is given to college students to determine the semester grades. The results are given in the frequency distribution. Determine the probabilities for each of the following. Use proper symbolism. Grade Frequency A- To A+ 6 B- To B+ 12 C- To C+ 3 D- To D+ 1 F or WF 2 24 a. earned better than a D. b. A student earned an A or B range grade. c. A student earned neither an A nor F range grade. d. A student earned at least a C range grade.
02 The following scores represent the final examination grades for an elementary statistics course: 23 60...
02 The following scores represent the final examination grades for an elementary statistics course: 23 60 79 32 57 74 52 70 82 36 80 77 81 95 41 65 92 85 55 76 52 10 64 75 78 25 80 98 81 67 41 71 83 54 64 72 88 62 74 43 60 78 89 76 84 48 84 90 15 79 34 67 17 82 69 74 63 80 85 61 Calculate: . Stem and leaf ....
10. Many states have programs for assessing the skills of students in various grades. The Indian...
10. Many states have programs for assessing the skills of students in various grades. The Indian Statewide Testing for Educational Progress (STEP) is one such program in arcant year, 76,531 tenth-grade Indiana students took the English language artsexam. The mean score was 572 and the standard deviation was 51. Use the fact that the ISTEP scores are approximately Normal, N 572, 51). Find the proportion of students who have scores greater than or equal to 620. (Fill in the blank...
Consider the following frequency distribution: Class 10 up to 20 20 up to 30 30up to...
Consider the following frequency distribution: Class 10 up to 20 20 up to 30 30up to 40 40 up to 50 Frequency 28 31 41 20 a. Construct the relative frequency distribution. (Round your answers to 3 decimal places.) Relative Frequency Class 10 up to 20 20 up to 30 30 up to 40 40 up to 50 the cumulative frequency distribution and the cumulative relative frequency distribution. (Round "Cumulative Relative Cumulative Frequency Relative Frequency Cumulative Class 10 up to...
The following data refers to the OAC average grades of students being accepted into first year...
The following data refers to the OAC average grades of students being accepted into first year of several Ontario universities. University Brock Guelph McMaster Queen's Ryerson Toronto Grade Distribution of New 1st Year Students 60 - 70 70 - 75 75 - 80 80 - 85 85 - 90 5.8 22.1 26.7 26.0 13.1 0 0.2 27.6 37.9 21.4 0.1 10.5 24.2 32.4 19.7 0 0.2 3.2 21.9 36.8 0.5 23.0 31.0 29.3 12.4 0 1.2 8.9 26.0 36.6 >...
Are grades higher on the second quiz? Here is a sample of grades
from a large introductory statistics course. We are interested in
testing whether the mean grade on the second quiz is higher than
the mean grade on the first quiz. You may assume any required test
assumptions have been met.
a) Complete the test if we assume that the grades from the first
quiz come from a random sample of 12 students in the course and the
grades...
The frequency distribution below indicates the numbers of students who earned grades (30s, 40s, etc.) on an exam If one of these students is randomly selected, what is the probability that he earned a grade that is NOT 59 or lower? Taly bars Class interval Frequency 30-39 2 40-49 3 50-59 11 60-69 20 70-79 32 HAI HA H 80-89 25 90-99 THI 7 N 100 Total 84/100 16/100 5/8 95/100
The frequency distribution below indicates the numbers of students...
Table 6.25 gives a sample of grades on the first two quizzes 1in an introductory statistics course. We are interested in testing whether the mean grade grade TABLE 6.25Are grades higher on the second quiz? First Quiz on the second quiz is significantly higher than the on the first quiz mean 72 9556 87 80 98 74 85 77 62 Second Quiz 78 96 72 89 80 95 86 87 82 75 Complete the test if we assume that the...
problem on chi-square test for homogeneity
2. Students often claim that the distribution of grades varies depending on the subject. From past records a university registrar chose random samples of grades from selected first year courses in English, Mathematics and Biology. Care was taken to exclude any student who may have taken two or more of these courses. The distribution of grades for each sample is given below. English Mathematics Biology 13 17 10 GRADEc42 15 24 (a) Test at...
02 The following scores represent the final examination grades for an elementary statistics course: 23 60 79 32 57 74 52 70 82 36 80 77 81 95 41 65 92 85 55 76 52 10 64 75 78 25 80 98 81 67 41 71 83 54 64 72 88 62 74 43 60 78 89 76 84 48 84 90 15 79 34 67 17 82 69 74 63 80 85 61 Calculate: . Stem and leaf ....
10. Many states have programs for assessing the skills of students in various grades. The Indian Statewide Testing for Educational Progress (STEP) is one such program in arcant year, 76,531 tenth-grade Indiana students took the English language artsexam. The mean score was 572 and the standard deviation was 51. Use the fact that the ISTEP scores are approximately Normal, N 572, 51). Find the proportion of students who have scores greater than or equal to 620. (Fill in the blank...
Consider the following frequency distribution: Class 10 up to 20 20 up to 30 30up to 40 40 up to 50 Frequency 28 31 41 20 a. Construct the relative frequency distribution. (Round your answers to 3 decimal places.) Relative Frequency Class 10 up to 20 20 up to 30 30 up to 40 40 up to 50 the cumulative frequency distribution and the cumulative relative frequency distribution. (Round "Cumulative Relative Cumulative Frequency Relative Frequency Cumulative Class 10 up to...
The following data refers to the OAC average grades of students being accepted into first year of several Ontario universities. University Brock Guelph McMaster Queen's Ryerson Toronto Grade Distribution of New 1st Year Students 60 - 70 70 - 75 75 - 80 80 - 85 85 - 90 5.8 22.1 26.7 26.0 13.1 0 0.2 27.6 37.9 21.4 0.1 10.5 24.2 32.4 19.7 0 0.2 3.2 21.9 36.8 0.5 23.0 31.0 29.3 12.4 0 1.2 8.9 26.0 36.6 >...
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