9. For 1980 through 1995, the number of college degrees D ( in thousands) earned by people in the United States and the percent of degrees P earned by women can be modeled by D= -0.0961 +3t -27t +911+1700 P=0.43t +49 where t is the number of years since 1980. Find a model that represents the number of degrees W ( in thousands) earned by women from 1980 to 1995. How many degrees were earned by women in 1991?

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Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.