$$\text { Construct a } 90 \% \text { confidence interval for } \beta 1 \text { when } \hat { \beta } 1 = 49 , s = 4 , \mathrm { SS } _ { \mathrm { XX } } = 55 \text {, and } n = 15 \text {. }$$

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The Answer of $$\text { Construct a } 90 \% \text { confidence interval for } \beta 1 \text { when } \hat { \beta } 1 = 49 , s = 4 , \mathrm { SS } _ { \mathrm { XX } } = 55 \text {, and } n = 15 \text {. }$$