Evaluate L 0 cos nx L cos mx L dx for n 0, m 0. Use the trigonometric identity cos a cos b = 1 2 [cos(a + b) + cos(a b)] . (Be careful if a b = 0 or a + b = 0.)

CHAPTER 8: CONFIDENCE INTERVALS FOR ONE POPULATION MEAN 8.1: Estimating a population mean • Common problem in statistics is to obtain information about the mean, ������������, of a population. • If population is small, we can ordinarily determine ������������ exactly by first taking a census and then computing ������������ from the population data. • If population is large, often...