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# : Oscar Winners - Listed below are the differences (in ISBN: 9780321836960 18

## Solution for problem 1CRE Chapter 4.8

Elementary Statistics | 12th Edition

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Problem 1CRE

1CRE: Oscar Winners - Listed below are the differences (in years) between the ages of actresses and actors when they won Oscars. The differences are found by subtracting the age of the male winner from the age of the female winner: (actress age) — (actor age). The differences are found using results from the last 12 years (as listed in Data Set 11 in Appendix B). ?20 ?15 ?3 ?12 6 ?15 ?7 ?9 16 ?18 ?15 ?15 a. Find the mean. Compare the result to the value of the mean that would be expected if there is no gender discrepancy between the ages of Oscar-winning actresses and actors. b. Find the median. Compare the result to the value of the median that would be expected if there is no gender discrepancy between the ages of Oscar-winning actresses and actors. c. Find the standard deviation. d. Find the variance. Be sure to include the units of measurement. e. Find the value of the first quartile, Q1. f. Find the value of the third quartile, Q3. g. Construct a boxplot. What does the boxplot suggest about the distribution of the data?

Step-by-Step Solution:

Solution 1CRE: The goal is to answer questions (a), (b), (c), (d), (e), (f), (g). Step 1 of 7: (a) We are given the following 12 data points: -20, -15, -3, -12, 6, -15, -7, -9, 16, -18, -15, -15. Use the mean formula to calculate the sample mean of the data: x = i = 20 + (15) + (3) + (12) + 6 + (15) + (7) + (9) + 16 + (1=) 1071 8.9215) n 12 12 Therefore, the sample mean is approximately -8.92 years. If there is no age discrepancy, then the mean should be 0 years. Step 2 of 7: (b) We are given the following 12 data points: -20, -15, -3, -12, 6, -15, -7, -9, 16, -18, -15, -15. Order the number from smallest to largest: -20, -18, -15, -15, -15, -15, -12, -9, -7, -3, 6, 16 The median is the number in the middle. In this case, we have two “middle” numbers: -15 and -12. So, the median is the average of these two numbers: 15 + (12) median = 2 = 13.5 Therefore, the median is -13.5 years. If there is no age discrepancy, then the median should be 0 years. Step 3 of 7: (c) We are given the following 12 data points: -20, -15, -3, -12, 6, -15, -7, -9, 16, -18, -15, -15. In part (a), we found that the sample mean is x = 8.92. Use the sample standard deviation formula to find the standard deviation of the sample: 2 s = (ix x ) n 1 2 2 2 2 2 = (20 (8.92)) + (15 (8.92)) + (3 (8.92)) + ··· + (15 (8.92)) + (15 (8.92)) 12 1 = 124119168 = 113.1742545 10.64 Therefore, the standard deviation of the sample is approximately 10.64 years. Step 4 of 7: (d) In part (c), we found that the sample standard deviation is s = 10.64. By definition, the variance is the square of the standard deviation. So, the sample variance is: 2 2 s = (10.64) 113.2 2 Therefore, the sample variance is approximately 113.2 (years) .

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##### ISBN: 9780321836960

Since the solution to 1CRE from 4.8 chapter was answered, more than 615 students have viewed the full step-by-step answer. Elementary Statistics was written by and is associated to the ISBN: 9780321836960. This full solution covers the following key subjects: Find, age, actresses, differences, actors. This expansive textbook survival guide covers 121 chapters, and 3629 solutions. The full step-by-step solution to problem: 1CRE from chapter: 4.8 was answered by , our top Statistics solution expert on 03/15/17, 10:30PM. The answer to “1CRE: Oscar Winners - Listed below are the differences (in years) between the ages of actresses and actors when they won Oscars. The differences are found by subtracting the age of the male winner from the age of the female winner: (actress age) — (actor age). The differences are found using results from the last 12 years (as listed in Data Set 11 in Appendix B). ?20 ?15 ?3 ?12 6 ?15 ?7 ?9 16 ?18 ?15 ?15 a. Find the mean. Compare the result to the value of the mean that would be expected if there is no gender discrepancy between the ages of Oscar-winning actresses and actors. b. Find the median. Compare the result to the value of the median that would be expected if there is no gender discrepancy between the ages of Oscar-winning actresses and actors. c. Find the standard deviation. d. Find the variance. Be sure to include the units of measurement. e. Find the value of the first quartile, Q1. f. Find the value of the third quartile, Q3. g. Construct a boxplot. What does the boxplot suggest about the distribution of the data?” is broken down into a number of easy to follow steps, and 190 words. This textbook survival guide was created for the textbook: Elementary Statistics, edition: 12.

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