Superior shields, a manufacturer of automobile windshields need to check if its product meets the industry standard of quality rating = 500 points. With population (-- here means its entire product) variance unknown, the manager picks a random sample of 10 industrial customers and finds their quality rating to Superior shields' windshields. These are recorded in the following:

Sample ID Quality Rating Industry Customer 1 485 Industry Customer 2 516 Industry Customer 3 505 Industry Customer 4 490 Industry Customer 5 495 Industry Customer 6 475 Industry Customer 7 510 Industry Customer 8 503 Industry Customer 9 478 Industry Customer 10 501