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SELF 3.42 The file Energy contains the per capita energy consumption, in kilowatt-hours, for each of the 50 states and the District of Columbia during a recent year. Test a. Compute the mean, variance, and standard deviation for the population. b. What proportion of these states has per capita energy con- sumption within 1 standard deviation of the mean, within +2 standard deviations of the mean, and within ±3 standard deviations of the mean? c. Compare your findings with what would be expected based on the empirical rule. Are you surprised at the results in (b)? d. Repeat (a) through (c) with the District of Columbia removed. How have the results changed?

SELF 3.42 The file Energy contains the per capita energy consumption, in kilowatt-hours, for each of the 50 states and the District of Columbia during a recent year. Test a. Compute the mean, variance, and standard deviation for the population. b. What proportion of these states has per capita energy con- sumption within 1 standard deviation of the mean, within +2 standard deviations of the mean, and within ±3 standard deviations of the mean? c. Compare your findings with what would be expected based on the empirical rule. Are you surprised at the results in (b)? d. Repeat (a) through (c) with the District of Columbia removed. How have the results changed?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Problem#6 SELF 3.42 The file Energy contains the per capita energy consumption, in kilowatt-hours, for each of the 50 states and the District of Columbia during a recent year. Test a. Compute the mean, variance, and standard deviation for the population. b. What proportion of these states has per capita energy con- sumption within 1 standard deviation of the mean, within +2 standard deviations of the mean, and within 3 standard deviations of the mean? c. Compare your findings with what would be expected based on the empirical rule. Are you surprised at the results in (b)? d. Repeat (a) through (c) with the District of Columbia removed. How have the results changed?
Transcribed Image Text:Problem#6 SELF 3.42 The file Energy contains the per capita energy consumption, in kilowatt-hours, for each of the 50 states and the District of Columbia during a recent year. Test a. Compute the mean, variance, and standard deviation for the population. b. What proportion of these states has per capita energy con- sumption within 1 standard deviation of the mean, within +2 standard deviations of the mean, and within 3 standard deviations of the mean? c. Compare your findings with what would be expected based on the empirical rule. Are you surprised at the results in (b)? d. Repeat (a) through (c) with the District of Columbia removed. How have the results changed?
State Wyoming D.C Kentucky South Caro Texas North Caro West Virgin Ohio Alabama Louisiana Idaho Tennessee Washingtor 16357 Indiana Mississippi 18277 15885 Arkansas Nevada Georgia North Dako Oregon Delaware Oklahoma Montana Nebraska Virginia lowa Kansas Missouri Florida Wisconsin Arizona Minnesota Maryland Illinois South Dak Kilowatt Hours 24567 20073 Michigan New Mexic Utah Colorado Maine Vermont Connecticu 19970 18885 18399 17902 17453 10993 15595 15050 15033 15022 14593 14511 14465 14380 14172 13926 13918 13743 13691 13536 13255 12743 12614 12393 12103 12067 12010 11425 10903 10806 10491 10344 10273 10002 9532 9309 9081 8867 8543 8095 New Jerse Alaska New Hamp Pennsylvar 8006 Hawaii 7913 Massachus 7744 New York 7135 Rhode Isla 6716 California 6396
Transcribed Image Text:State Wyoming D.C Kentucky South Caro Texas North Caro West Virgin Ohio Alabama Louisiana Idaho Tennessee Washingtor 16357 Indiana Mississippi 18277 15885 Arkansas Nevada Georgia North Dako Oregon Delaware Oklahoma Montana Nebraska Virginia lowa Kansas Missouri Florida Wisconsin Arizona Minnesota Maryland Illinois South Dak Kilowatt Hours 24567 20073 Michigan New Mexic Utah Colorado Maine Vermont Connecticu 19970 18885 18399 17902 17453 10993 15595 15050 15033 15022 14593 14511 14465 14380 14172 13926 13918 13743 13691 13536 13255 12743 12614 12393 12103 12067 12010 11425 10903 10806 10491 10344 10273 10002 9532 9309 9081 8867 8543 8095 New Jerse Alaska New Hamp Pennsylvar 8006 Hawaii 7913 Massachus 7744 New York 7135 Rhode Isla 6716 California 6396
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