The probability of at least 43 boys

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.

Robert is replacing sod in two square shaped areas of his backyard.one side of the first area is 7.5 feet.one side of the other is 5.7 feet.the sod costs y dollars per square foot.

Point a is located at (? 5, 2) on a coordinate grid. point a is translated 1 unit to the left and 5 units down to create point a'. which measurement is closest to the distance between point a and point a' in units? a) 4.7 units b) 4.9 units c) 5.1 units d) 5.3 units