MAT 142 – October 18, 2011 MAT142 Name:________________ MAT 142 Intro to Statistics Worksheet 1. Consider the set of test scores shown below 88 82 95 71 91 95 86 83 76 48 83 96 92 86 94 90 94 61 71 72 100 92 83 50 84 89 87 66 99 99 96 84 73 72 70 59 92 93 95 46 83 93 49 49 80 100 71 94 96 91 62 85 94 90 98 74 93 100 88 75 92 98 50 99 100 87 89 92 96 100 87 99 98 90 89 97 84 71 (a) Organize the test data into a frequency table. Use classes of width 10, starting with 40. Include columns for both the frequency and the relative frequency (b) Use the frequency distribution in part (1) to create a frequency histogram of the data. Remember to give your chart a title and to label your axes. (c) Create a stem-and-leaf diagram of the test data. (d) From the stem-and-leaf diagram, state the median and mode of the above test data. Median = Mode =2. The following is the IQ test score for a random sample of 10 fifth -grade students: 90, 110, 118, 120, 122, 125, 126, 130, 135, 138 a) Give the 5-number summary of the data (MIN, MAX, Median, Q1 and Q3) and make a box plot. MIN = MAX= Median= Q1= Q3= Box plot (use the scale below to help, but draw the box plot above the scale, not on it.): 3. The histogram below shows the number of people who signed up for an aerobics class: (a) How many people signed up who were aged 40 or below? (b) How many total people signed up? (c) In what age range would the median age be found
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