5.to test h0: s=1.8 versus h1: s>1.8, a random sample of size n=18 is obtained from a population that is known to be normally distributed. (a)if the sample standard deviation is determined to be s=2.4,compute the test statistic. (b)if the researcher decides to test this hypothesis at the a=0.10 level of significance, determine the critical value. (c)draw a chi-square distribution and depict the critical region. (d)will the researcher reject the null hypothesis? why