Question: A certain brand of fluorescent light tube was advertised as having an effective life span before burning out of 200 hours. A random sample of 64 bulbs was burned out with a mean illumination life span of 250 hours and with a sample standard deviation of 10 hours. Conduct a one-tail hypotheses test at alpha = .05 to determine if this sample data provides sufficient evidence to indicate that the bulbs have their advertised life expectancy. Do NOT do a confidence interval.