The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took these 100 customers to check out was 3.0 minutes. It is known that the standard deviation of the checkout time is 1 minute.The standard error of the mean equals O 1.000 O 0.100 O 0.010 O 0.001

In a one-tail test, the p-value is found to be equal to 0.068. If the test had been two-tail, the p-value would have been: O 0.932 O 0.136 O 0.068 O 0.034

If we reject the null hypothesis when it is false, then: O the level of significance wasn't properly set O a Type I error. O both a Type I error and a Type Il error, depending on the problem statement. O none of the choices is true. For a left-tail test of hypothesis where Alpha = .02 and the distribution is Normal, O You will reject the Null if z-stat=-1.645 O You may or may not reject the Null z-stat=-2.33 You will not reject the Null if z-stat=-2.33 O None of the choices is correct.

Which of the following statements is not true? O The probability of making a Type Il error increases as the probability of making a Type I error decreases. O The probability of making a Type Il error and the level of significance are the same. O The power of the test decreases as the level of significance decreases O All of these choices are true.

A p-value is the O probability of a Type Il error O value of the test statistic O probability, when the null hypothesis is true, of obtaining a sample result that is at least as unlikely as what is observed O probability corresponding to the critical values) in a hypothesis test