What kind of error might you make

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Question: 1. Suppose you are testing the null hypothesis that a mean equal 75 versus a two-tailed alternative. If the true (but unknown) mean is 80, what kind of error might you make? When will you not make this error?

2. Explain exactly what it means for a test statistic to fall in the rejection region.

3. Suppose that you wish to test a researcher's claim that the mean height in meters of a normally distributed population of rose bushes at a nursery has increased from its commonly accepted value of 1.60. To carry out this test, you obtain a random sample of size 150 from this population. This sample yields a mean of 1.80 and a standard deviation of 1.30. What are the appropriate null and alternative hypotheses? Is this a one-tailed or two-tailed test?

Reference no: EM132287893

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