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  3. question 1 an insurance company collects data on seatbelt use...

Question: question 1 an insurance company collects data on seatbelt use...

Question details

Question 1-

An insurance company collects data on​ seat-belt use among drivers in a country. Of 1800 drivers 20-29 years​ old, 35% said that they buckle​ up, whereas 479 of 1500 drivers 45-64 years old said that they did. Find a 90% confidence interval for the difference between the proportions of​ seat-belt users for drivers in the age groups 20-29 years and 45-64 years.

The 90​% confidence interval for p1-p2 is?

Question 2-

The coefficient of determination of a set of data points is 0.598 and the slope of the regression line is 3.22 Determine the linear correlation coefficient of the data.

What is the linear correlation​ coefficient? r=?

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