A randorn sample of size 15 is selected from a normal population. The population standard deviation is unknown, Assume that a two-tailed test at the 0.10 significance level is to be used. For what value of t will the null hypothesis not be rejected?

O To the left of -1.282 or to the right of 1.282 O To the left of -1.345 or to the right of 1.345 O Between -1.761 and 1.761 O To the left of -1.645 or to the right of 1.645

You want to start a restaurant. You figured that if the average bill / person is more than $10.2, you'll be fine. To do this, you decide to take a sample of a few potential customers and based on your Type I error of 6%, calculated a cut-off dollar amount of $10.65. You are, of course, worried about the flip side - the Type Il error. So, if population are really willing to spend $11.10 / meal, what is your approximate Type I error assuming standard error of the the mean is 40?

O 13.02% O 3.56% O More than 6% because Type I is always less than Type Il 0 1.22%

Which of the following does not need to be known in order to compute the p-value? O knowledge of whether the test is one-tailed or two-tailed O the value of the test statistic O the level of significance O All of these are needed.

The level of significance in hypothesis testing is the probability of O accepting a true null hypothesis O accepting a false null hypothesis O rejecting a true null hypothesis O could be any of the above, depending on the situation