1. The breaking strength of a textile fiber is normally distributed random variable. Specification requires but the mean breaking strength should be equal to 150 psi. A quality control officer would like to detect any significant departure from this value. A random sample of 15 fiber specimens is selected and their breaking strength. The sample mean is computed as 152.18 psi. The standard deviation is 16.63. Ho: = 150 psi. Use level of significance at 0.05. 2. A geneticist studying heredity in tomatoes wanted to verify whether the segregation of the F1 generation of his cross between red flesh variety and yellow flesh variety would be if the ratio 3:1 as theorized by Mendel trial. In his trials he computed 310 red flesh and 90 yellow flesh tomatoes fruit from out of 400 in the F1 generation. Use 5% level of significance. ( 25%) Ho : Red : yellow = 3:1