ASAP please 4

ERTA eClass Steel rods are widely used in the construction industry. Suppose a manufacturer of steel rods is experimenting with a new technology that is supposed to increase the mean breaking strength of the rods. A random sample of 14 rods was obtained with old technology (OLD) and another random sample of 14 was obtained with the new technology (NEW). The breaking strength of each rod in the two groups was determined (in psi, pounds per square inch). Then, the 14 new technology rods were subjected to high pressure in three high pressure chambers and the breaking strength of each of the 14 rods was determined again (NEWHPRESS). OLD 52 55 45 48 43 63 54 62 58 70 52 68 58 49 NEW 65 67 66 66 14 70 60 56 63 59 58 55 NEWHPRESS 70 71 62 70 72 78 78 62 62 66 63 60 65 a. Now assume that the 14 observations for new technology rods constitute a random sample from the population of all new technology rods. What is the 90% confidence interval for the mean strength of new technology rods? (61.094, 65.335) (60.98, 65.448) (60.284, 66.145) (52.249, 74.179) (61.774, 64.654) b. Do the data provide any evidence that the mean strength of new technology rods exceeds 58 psi? Carry out the appropriate test to answer the question. What is the value of the appropriate test statistic? 3.151 O-3.151 0.842 1 576