a) what are the correct hypothesis for this test? The null hypothesis is H0: The alternative hypothesis is H1: B) calculate the value of the test statistic X squared= C) use technology to determine the p-value for the test statistic what is the p-value? D)what is the correct conclusion at the = 0.01 level of significance Since the pvalue is ........ than the level of significance ....... The null hypothesis. There ..... sufficient evidence to conclude that the standard deviation has decreased at the 0.01 level of significance

The piston diameter of a certain hand pump is 0.6 inch. The manager determines that the diameters are normally distributed, with a mean of 0.6 inch and a standard deviation of 0.003 inch. After recalibrating the production machine, the manager randomly selects 28 pistons and determines that the standard deviation is 0.0027 inch. Is there significant evidence for the manager to conclude that the standard deviation has decreased at the a = 0.10 level of significance