State the null and alternative hypotheses for eachconjecture.
a. A researcher thinks that if expectant mother use vitaminpills, the birth weight of the babies will increase. The averagebirth weight of the population is 8.6 pounds.
b. An engineer hypothesizes that the mean number of defects canbe decreased in a manufacturing process of compact disks ny usingrobots instead of humans for certain tasks. The mean number ofdefective disks per 1000 is 8.
c. A psychologist feels that playing soft music during a testwill change the results of the test. The psychologist is not surewhether the grades will be higher or lower. In the past, the meanof the scores was 73.
