Need a little help on these two, I did part of it but is #8 a Type 1 error? The

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Need a little help on these two, I did part of it but is #8 a Type 1 error? The first one is a short question but if you are kind of a stickler then I'd rather have #9 answered, thanks. I'm reviewing for exam so I really need to understand. 8. An engineer has designed an improved light bulb. The previous design had an average lifetime of 1200 hours. Using a sample of 2000 of these new bulbs, the average lifetime of this improved light bulb is found to be 1201 hours. Although the difference is quite small, the effect was statistically significant at the 0.05 level. Suppose that, in fact, there is no difference between the mean lifetimes of the previous desi design. Which of the following statements is TRUEP gn and the new a) Type I error was committed b) Type II error was committed 9 A researcher plans to conduct a test of hypotheses at the 1% significance level. She designs her study to have a power of 0.90 at a particular alternative value of the parameter of interest. What is the probability tha the researcher will commit a Type II error for the particular alternative value of the parameter at which she computed the power?

Explanation / Answer

8)

Type I error is commited because if you reject Ho , then you are saying that there are not equal when in fact it did

9)

please post it in a new qeustion

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