To test H0: = 4.3 versus H1: 4.3, a random sample of size n = 12 is obtained from a population that

To test H0: σ = 4.3 versus H1: σ ≠ 4.3, a random sample of size n = 12 is obtained from a population that is known to be normally distributed.
(a) If the sample standard deviation is determined to be s = 4.8, compute the test statistic.
(b)If the researcher decides to test this hypothesis at the a = 0.05 level of significance, determine
the critical values.
(c)Draw a chi-square distribution and depict the critical regions.
(d)Will the researcher reject the null hypothesis? Why?