Aball is thrown from an initial height of 6 feet with an initial upward velocity of 23ft/s . the ball's height h (in feet) after t seconds is given by the following. h=6+23t-16t^2 find all values of t for which the ball's height is 14 feet. round your answer(s) to the nearest hundredth. (if there is more than one answer, say "or")

Arandom sample of 45 observations results in a sample mean of 68. the population standard deviation is known to be 23 a. compute the margin of error at a 959% confidence interval. b. compute the 95% confidence interval for the population mean c. compute the 90% confidence interval for the population mean. d. compute the 75% confidence interval for the population mean