statistic Math 221

Jun 22nd, 2016
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Full statistics practice questions with detailed solutions

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Final ExamReview QuestionsYou should work each of the following on your own, thenreview the solutions guide. DO NOT look at the solutions guidefirst.1. Determine whether the following are nominal, ordinal, interval, andratio.a. Daily temperatures in Ripon, WIb. Test scores in statistics classSolution: (a) would be interval as there is no zero while (b) would beratio as there is a zero.2. The following numbers represent the weights in pounds of six 7-yearold 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 classmean = 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) =29.0864. 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 ofthe distribution.Solution:2|2192003|487144|01975|6|6This distribution is right skewed (positively skewed) because the tailextends to the right.5. Find the regression equation of the following data.Xy614533743654521633843924428Solution: y-hat = 24.32x + 1.32, found by using Data and then DataAnalysis menu option.6. To predict the annual rice yield in pounds we us

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