Past data indicate that the amount of money contributed by the working residents of a large city to a volunteer rescue squad is a normal random variable with a standard deviation of $1.40. It has been suggested that the contributions to the rescue squad from just the employees of the sanitation department are much more variable. If the contributions of a random sample of 12 employees from the sanitation department have a standard deviation of $1.75, can we conclude at the 0.01 level of signicance that the standard deviation of the contributions of all sanitation workers is greater than that of all workers living in the city?

ST 512 Week 8 and Week 9 Notes MaLyn Lawhorn October 2 2017, October 9, 2017, and October 11, 2017 R Notation R notation is a way to describe a reduced model. The notation looks like R(▯ q+1;▯ q+2;▯▯▯ ;▯ p▯ 1▯ 2▯▯ ;▯ )q where ▯ 1 ▯ aqe the coefﬁcients in the reduced model and ▯ q+1 ▯ ▯ pre the coefﬁcients left out of the reduced model. So, if we have full model Y = ▯ +0▯ x 1 ▯1x + 2 x2+ E 3 3 and we have R(▯ ;2 j▯3),1then the reduced model being described is Y = ▯ 0 ▯ x 1 1: Notice that we always assume that ▯ is0included in the reduced model even though it is not ex- pressed in the notation. R(▯ ;▯▯▯ ;▯