1100 students took Exam 3 last semester. At the grading meeting I randomly picked 100 exams to grade to estimate the average of all 1100 exams. The average of the 100 graded exams was 86 with a SD of 10. Which most closely resembles the relevant box model? The box has 1100 tickets with an average of 86 and a SD of 10 The box has 100 tickets, marked with numbers ranging from about 20 to 100 The box has 1100 tickets marked with “1”s and “0”s The box has 100 tickets marked with “1”s and “0”s The box has 1100 tickets, marked with numbers ranging from about 20 to 100, the exact average is unknown but estimated from the sample Tries 0/2 The draws are made _________ replacement. with without Tries 0/1 How many draws from the box? Tries 0/3 The best estimate for the average of all 1100 exams is Tries 0/3 What is the SE of the sample average? Tries 0/3 The exam scores do not follow the normal curve. Is it still possible to construct a 95% confidence interval for the average exam score of all 1100 students? Hint: Read the top of page 196. No, it’s never possible to construct confidence intervals for averages Yes, even though the data doesn’t follow the normal curve, the probability histogram for the average of 100 draws will come pretty close to following the normal curve No, if the data does not follow the normal curve, it’s never possible to construct confidence intervals Tries 0/1 A 95% confidence interval for the average of the whole class is what? Put the lower number first. ( to ) Tries 0/3
This question was answered on: May 23, 2022
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