[SLO 1] The average weight of randomly selected 35 compact automobiles was 2680 pounds. The sample standard deviation was 400 pounds. Find the following: (a) The point estimate and error of...

[SLO 1] The average weight of randomly selected 35 compact automobiles was 2680 pounds. The sample standard deviation was 400 pounds.
Find the following:
(a) The point estimate and error of estimation.
(b) The 98% confidence interval of the population mean.
(c) The 98% confidence interval of the mean if a sample of 60 automobiles is used instead of a sample of 35.