MATH399 Final Exam Review Solutions

Final Exam Review Questions Solutions Guide You may want to PRINT THIS so you can carefully check your answers. Be sure to ask your instructor if you have questions about any of the solutions given below. 1. Determine if each of the following represents nominal, ordinal, interval, or ratio data. a. Movie ratings b. Test scores c. Colors of shirts Solution: (a) ordinal data since movie ratings have an order, but cannot be subtracted; (b) ratio data since there is a real zero; (c) nominal data as there is not even order to these data. 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; range; variance; standard deviation. Solution: mean = 46.17 median = 48 mode does not exist range = 35.00 variance = 134.57 standard deviation =11.60 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