The data for a sample of 80 steel parts, given in the accompanying table, show the reported difference, in inches, between the actual length of the steel part and the specified length of the steel part. For example, a value of - 0.002 represents a steel part that is 0.002 inch shorter than the specified length. Complete parts (a) through (d). Click the icon to view the data table. a. At the 0.05 level of significance, is there evidence that the mean difference is different from 0.0 inches? State the null and alternative hypotheses. - X Ho: H = 0 Differences data H: u # 0 Determine the test statistic. Difference between actual length and specified length Full data set - 0.0025 0.0030 0.0030 0.0015 0.0010 0.0020 0.0005 - 0.0030 tSTAT =. - 0.0025 0.0025 - 0.0015 - 0.0020 0.0005 0.0020 0.0030 0.0030 0.0025 (Round to two decimal places as needed.) 0.0020 0.0010 0.0030 - 0.0005 - 0.0010 0.0010 - 0.0005 - 0.0010 - 0.0030 0.0030 0.0005 - 0.0030 0.0020 0.0010 - 0.0030 0.0025 - 0.0025 0.0030 0.0005 0.0005 0.0015 0.0015 0.0015 0.0005 0.0015 - 0.0015 0.0015 0.0020 - 0.0025 0.0015 0.0030 0.0025 0.0015 - - 0.0030 - 0.0010 0.0025 0.0010 - 0.0025 - 0.0015 - 0.0025 0.0005 0.0030 - 0.0005 0.0030 0.0025 0.0030 0.0015 0.0020 0.0010 - 0.0030 - 0.0015 - 0.0005 - 0.0020 - 0.0015 - 0.0025 - 0.0015 - 0.0015 0.0025 - 0.0030 0.0015 - 0.0020 - - 0.0030 - 0.0025