Q. In an investigation of daylight savings time, researchers at the University of Colorado found 302 traffic deaths in 10 years for the Monday following the spring time change. On a regular Monday there are about 258 traffic deaths in 10 years. Does daylight savings time increase the number of traffic deaths?

Q. Epistasis is a phenomenon in which one gene controls the expression of another. In one case, a dihybrid cross should yield a 9:3:4 ratio.

You collect the following data on mice:

Black coat: 69 Brown coat: 23 White coat: 30

Is there any reason to doubt the ratio of 9 black : 3 brown : 4 white?