A study of external disk drives finds the following,

The least squares line was found to be: price = 18.64 + 0.104 Capacity with se = 17.95 and SE (b1) = 0.0051.
a) Find the predicted Price of a 1000 GB hard drive.
B) Find a 95% confidence interval for the mean Price of all 1000 GB disk drives.
c) Find the 95% prediction interval for the Price of a 1000 GB hard drive.

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Electricity Cost Month Machine Hours January 3,250 22,080 February 3,770 25,200 March 2,470 16,200 April 4,030 27,600 May 4,940 33,900 June 4,290 26,400 July 5,330 29,700 August 4,550 27,300 2,600 September 18,600 October 4,810 31,200 November 6,110 37,200 33,300 December 5,460