STATS: A company claims that its light bulbs have a lifespan of 5000 hours with a standard deviation of 600 hours. You decide to verify this statement. You select 35 bulbs at random and you get a mean of 4650 hours and a standard deviation of 650 hours. Calculate the confidence interval for the lifetime of all light bulbs in the company, with a confidence level of 95% and draw the appropriate conclusions. You must provide: hypotheses, confidence intervals, decision and conclusion. Remember to interpret your results