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MAT 155 Chapter 3 The following is a brief review of Chapter 3. This does NOT cover all the material in that chapter. Click on Slide Show and View Slide Show. Read and note your answer to the question. Advance the slide to see the answer. Thanks to Ms. Valerie Melvin for her portion of this review. Dr. Claude Moore, Math Instructor, CFCC Which measure of center is the only one that can be used with data at the nominal level of measurement? 1. Mean 2. Median 3. Mode Which of the following measures of center is not affected by outliers? 1. Mean 2. Median 3. Mode Find the mode for the given sample data. 79, 25, 79, 13, 25, 29, 56, 79 1. 2. 3. 4. 79 48.1 42.5 25 Which is not true about the variance? 1. It is the square of the standard deviation. 2. It is a measure of the spread of data. 3. The units of the variance are different from the units of the original data. 4. It is not affected by outliers. Weekly sales for a company average $10,000 with a standard deviation of $450. Sales for the past week were $9050. This is 1. unusually high. 2. unusually low. 3. about right. In a data set with a range of 55.1 to 102.8 and 300 observations, there are 207 data points with values less than 88.6. Find the percentile for 88.6. 1. 2. 3. 4. 32 116.03 69 670 Which graphic display shows the least detailed information? 1. Histogram 2. Stem-and-leaf plot 3. Boxplot Last year, nine employees of an electronics company retired. Find the mean retirement age: 52, 50, 60, 68, 64, 50, 64, 58, 50. 1. 2. 3. 4. 56.1 years 56.7 years 58.0 years 57.3 years Listed below are the amounts of time (in months) that the employees of an electronics company have been working at the company. Find the midrange. 120, 203, 250, 132, 290 1. 2. 3. 4. 250 months 199 months 203 months 205 months Jeanne is currently taking college zoology. The instructor often gives quizzes. On the past five quizzes, Jeanne got the following scores: 18, 16, 3, 1, 20. Find the variance. 1. 2. 3. 4. 107.3 79.3 63.4 79.2 The maximum value of a distribution is 47.5 and the minimum value is 4.0. Use the range rule of thumb to estimate the standard deviation. Round results to the nearest tenth. 1. 2. 3. 4. 7.9 18.9 10.9 15.9 Which score has the highest relative position: a score of 51.5 on a test for which the mean is 47 and s = 9; a score of 5.9 on a test for which the mean is 4.2 and s = 1.2; or a score of 460.8 on a test for which the mean is 444 and s = 42? 1. A score of 51.5 2. A score of 460.8 3. A score of 5.9