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A sales person makes 15 sales calls a day. If the probability of closing a sale is 40%, what is the probability that the sales person will close at least 8 sales? a. 0,095 b. 0.213 c. 0.787 d. 0.905 In calculating confidence intervals, Mark generally chooses a 99% confidence level rather than the more customary 95%. Mark's 99% confidence levels will be than 95% confidence levels. Also Mark will have risk of the true population values lying outside the 99% confidence interval compared to a 95% confidence interval. Fill in the blanks useing one of the following options: a. wider; higher b. wider: lower c. narrower ; higher d. narrower: lower Which of the following is the best definition for the significance level, alpha, which is used in hypothesis testing? a. Alpha is the probability that H0 is not rejected, when H0 is true b. Alpha is the probability that H0 is rejected, when H0 is true c. Alpha equals one minus beta d. Alpha is the probability that random variation could cause a sample to appear at least as far from H0 as the observed data, when H0 is true. You are testing the null hypothesis that the mean weight of components is 91mg against the alternative that the mean is greater than 91mg. Based on the following output, what is the p-value for this test? a. 0.0367 b. 0.0184 c. 0.9816 d. 0.95 e. None of the above