A machine is designed to fill jars with the 16 ounces of coffee. A consumer suspects that machine isn't filling the jars completely. A sample of 8 jars has the mean of 15.6 ounces and standard deviation of 0.3 ounce. Is there enough evidence to support consumer's conjecture at a = 0.05?"
a) First, determine the alternative and the null hypotheses.
b) Secondly, compute the critical value and df.
c) Next, employ the appropriate formula.
d) Finally, decide whether or not to reject null hypothesis.