In formulating the null and alternative hypothesis, which of the following would be an
acceptable null hypothesis?
a. the population mean is greater than 20
b. the population mean is smaller than 20
c. the population mean is equal to 20
d. the population mean is not equal to 20
e. none of these
.
Solution
c). The population mean is equal to 20 The null hypothesis takes the stance of
nothing has changed or there is no difference.