An electrical firm manufactures light bulbs that have a lifetime that is approximately normally distributed with a mean of 800 hours and a standard deviation of 40 hours. Test the hypothesis that μ = 800 hours against the alternative, μ is not equal to 800 hours, if a random sample of 30 bulbs has an average life of 788 hours. Determine Z calculator at alpha = 0.05 in two decimal places. Blank 1 Determine Z calculated in two decimal places. Blank 2. Statistically speaking is the lifetime of bulbs approximately equal to 800 hours? yes or no Blank 3

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