You throw a volleyball upward with an initial vertical velocity of 38.4 feet per second from a building that is 18 feet tall. Use
the vertical motion model, h = -16t2 + vt + s where v is
the initial velocity in feet per second and s is the initial height
in feet, to calculate how long the volleyball will be in the air
for. Round your answer to the nearest tenth.

Time in the air: ???
seconds

Arandom sample of 15 observations is used to estimate the population mean. the sample mean and the standard deviation are calculated as 172 and 63, respectively. assume that the population is normally distributed. a. with 99 confidence, what is the margin of error for the estimation of the population mean? b. construct the 99% confidence interval for the population mean. c. construct the 95% confidence interval for the population mean. d. construct the 83% confidence interval for the population mean. hint: you need to use excel function =t.inv.2t to find the value of t for the interval calculation.