A credit company randomly selected 60 contested items and recorded the dollar amount being contested. These contested items had sample mean 92 = 75 dollars and sample variance 52 = 9. a) Give a point estimate of the population mean contested amount 11. b) Calculate a 90% condence interval for the population mean contested amount. 0) Ifthe credit company conjectured that average dollars spent by its customers are more than 74, will you accept it or not? Note: you can simply use 2 table due to n is not listed in t table