MATH 221 FINAL EXAM REVIEW(Version 2) QUESTIONS WITH ANSWERS: DEVRY UNIVERSITY

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MATH 221 FINAL EXAM REVIEW (Version 01) : DEVRY UNIVERSITYFinal Exam Review Questions You should work each of the following on your own, then review the solutions guide. DO NOT look at the solution... s guide first. 1. Determine whether the following are nominal, ordinal, interval, and ratio. a. Daily temperatures in Ripon, WI b. Test scores in statistics class Solution: (a) would be interval as there is no zero while (b) would be ratio as there is a zero. 2. The following numbers represent the weights in pounds of six 7-year old children in Mrs. Jones' 2nd grade class. {25, 60, 51, 47, 49, 45} Find the mean; median; mode; variance; standard deviation. Solution: This would be a sample from the class mean = 46.166 (=AVERAGE) median = 48 (=MEDIAN) mode does not exist (looking at the data) variance = 134.5667 (=VARIANCE.S) standard deviation =11.60029 (=STDEV.S) 3. If the variance is 846, what is the standard deviation? Solution: standard deviation = square root of variance = sqrt(846) = 29.086 4. If we have the following data: 34, 38, 22, 21, 29, 37, 40, 41, 22, 20, 49, 47, 20, 31, 34, 66. Draw a stem and leaf. Discuss the shape of the distribution. Solution: 2 | 2 1 9 2 0 0 3 | 4 8 7 1 4 4 | 0 1 9 7 5 | 6 | 6 This distribution is right skewed (positively skewed) because the “tail” extends to the right. 5. Find the regression equation of the following data. [Show More]

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