Question: Please help with my stats homework, I am really confused on this question (it's three-parts)! Thank you so much! Questions 7 through 9 involve the

Please help with my stats homework, I am really confused on this question (it's three-parts)! Thank you so much!

Questions 7 through 9 involve the following data set.

Increase in Life Expectancy in the United States during the 20th Century Expected Expected Year Life Span Year Life Span 1920 54.1 1975 72.6 1930 59.7 1980 73.7 1940 62.9 1985 74.7 1950 68.2 1990 75.4 1960 69.7 1995 75.8 1970 70.8 Source: National Center for Health Statistics, published in the 1998 World Almanac

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