Listed below are costs (in dollars) of air-fares for different airlines from New York City to San Francisco. The costs are base on tickets purchased 30 days in advance and on day in advance. 30 days x...

Listed below are costs (in dollars) of air-fares for different airlines from New York City to San Francisco. The costs are base on tickets purchased 30 days in advance and on day in advance.

30 days x 240 250 254 284 288 328 290

One day y 556 514 587 843 728

988 536

Compute the correlation coefficient.

Compute the slope of the linear regression line.

Compute the y-intercept of the linear regression

Use the equation of the regression line(and parts b. and c.) to give a point estimate of the cost of a ticket purchased one day in advance, given the ticket cost of $310 if purchased 30 days in advance of the flight.

Give a 95% confidence interval for y when x is $310.