of Fit: Chi-square test 2. Scores on a university exam are normally distributed
ID: 3318308 • Letter: O
Question
of Fit: Chi-square test 2. Scores on a university exam are normally distributed with a mean of 7s and a standard of 8. A score of at least 70 is required for C. Using the 68-95-. questions: deviation What percentage of students scored below 62? a. b. What percent of students scores between 70 and 867 C. Wh at percentage of students earned a grade of at least a C The local genealogical society in Pike County, Ohio has compiled records on all 55,901 gravestones in cemeteries in the county for the years 1825 to 1985. They choose a simple random sample of 395 records to check their accuracy by visiting the actual gravestones. 3. a. How would you label the 55,901 records (just give a range from smallest to largest, not 00001, 00002,-55,qai b. Use Table B (attached), starting at line 120, to choose the first 5 records for the sample ALL the labels) S5,g01 (Show your work)Explanation / Answer
2. According to 68-95-99.7 rule, 68%, 95% and 99.7% of normally distributed data lies within 1,2 and 3 standard deviations of mean
Mean = 78
Standard deviation = 8
a) 62 is 2 standard deviation below mean
Percentage of students scored below 62 = (100 - 95)/2 = 2.5%
b) Percentage of students between 70 and 86 = 68% (within 1 standard deviation of mean)
c) Perecentage of students with at least C = Percentage of students who scored above 70 = 50 + 68/2 = 84%
P.S - Please post different questions separately
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