Data on life expectancy for a sample of countries in 2005 and 2010 2005 2010 Country Life Expectancy at Birth Country Life Expectancy at Birth Canada 80 Canada 81 United States 78 United States 78 Mexico 75 Mexico 76 Columbia 72 Columbia 73 Japan 81 Japan 82 China 72 China 74 Sudan 59 Sudan 61 Kenya 53 Kenya 59 Italy 80 Italy 80 Germany 79 Germany 79 What is the standard deviation for 2005 life expectancy, if (x- negativex)squared 2 = 824.9 Group of answer choices 37.21 82.49 9.08 50.41
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The formula provided in the question seems to be a bit unclear or incorrectly transcribed. However, it appears to be related to the calculation of variance or standard deviation. The standard deviation formula for a sample is the square root of the variance, and Show more…
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Life Expectancies A random sample of nonindustrial- ized countries was selected, and the life expectancy in years is listed for both men and women. $$ \begin{array}{l|lllllll}{\text { Men }} & {\text { 59.7 }} & {72.9} & {41.9} & {46.2} & {50.3} & {43.2} \\ \hline \text { Women } & {63.8} & {77.8} & {44.5} & {48.3} & {54.0} & {43.5}\end{array} $$ $$ \begin{array}{l}{\text { Find women's life expectancy in a country where men's }} \\ {\text { life expectancy }=60 \text { years. }}\end{array} $$
Correlation and Regression
Regression
The table below shows the life expectancy for an individual born in the United States in certain years: Year of Birth | Life Expectancy 1930 | 59.7 1940 | 62.9 1950 | 70.2 1965 | 69.7 1973 | 71.4 1982 | 74.5 1987 | 75 1992 | 75.7 2010 | 78.7 a. Decide which variable should be the independent variable and which should be the dependent variable. b. Draw a scatter plot of the ordered pairs. c. Calculate the least squares line. Put the equation in the form of: Ĺ· = a + bx d. Find the correlation coefficient. Is it significant? e. Find the estimated life expectancy for an individual born in 1950 and for one born in 1982. f. Why aren't the answers to part e the same as the values in the table that correspond to those years? g. Use the two points in part e to plot the least squares line on your graph from part b.
Sheryl E.
The table below gives the average life expectancy (in years) of a person from a certain country based on various years of birth. Use a TI-83, TI-83 plus, or TI-84 calculator to find the equation of the regression line, using the year as the independent variable and the average life expectancy as the dependent variable. Round the slope and intercept to one decimal place. Year of Birth Life Expectancy 2001 62.977 2002 63.368 2003 63.759 2004 64.154 2005 64.556 2006 64.966 2007 65.383 2008 65.802 2009 66.219 2010 66.625 2011 67.013 2012 67.377 2013 67.714 2014 68.021
T. L.
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