2. Jacob is a qualify assurance engineer of a SSD (solid state disk) manufacturer. It is known from previous studies that, for a SSD model 970Pro. Its lifetime follows normal distribution and the standard deviation of its lifetime is 1 year. Now. Jacob is told by his colleagues that the mean lifetime of a SSD model 970Pro should be 3 years. To verify this information, Jacob randomly selects 25 SSDs from the 970Pro production line for testing. From these 25 SSDs. he finds that the average lifetime of the sample he drawn is 3.412 years. Please help Jacob to perform a hypothesis test on the average lifetime of 970Pro with a pvalue threshold of 0.05. [12%]