4) In preparation for next year's Boston marathon, a trainer wants to estimate the population mean top 15 finishing time for male runners within 2 minutes. Determine the minimum sample size required to construct a 99% confidence interval for the population mean finishing time of male runners. Assume the population standard deviation is 4 minutes. Formula for sample size: n = (-co) 5) Recalculate the minimum sample size from #4 using 90% confidence and everything else remaining the same. Does the minimum sample size increase or decrease? Explain. 6) Recalculate the minimum sample size from #4 using a 5 minute margin of error and everything else remaining the same. Does the minimum sample size increase or decrease? Explain