Question: Suppose the mean wait time for a telephone reservation agent at
Suppose the mean wait-time for a telephone reservation agent at a large airline is 43 seconds. A manager with the airline is concerned that business may be lost due to customers having to wait too long for an agent. To address this concern, the manager develops new airline reservation policies that are intended to reduce the amount of time an agent needs to spend with each customer. A random sample of 250 customers results in a sample mean wait-time of 42.3 seconds with a standard deviation of 4.2 seconds. Using an α = 0.05 level of signiﬁcance, do you believe the new policies were effective? Do you think the results have any practical signiﬁcance?
Answer to relevant QuestionsThe Gallup organization conducted a survey and asked, “What do you think is the ideal number of children for a family to have?” The results of the survey are shown in the table. Ideal Number of Children .... Frequency 0 ...A statistics student heard that an individual’s arm span is equal to the individual’s height. To test this hypothesis, the student used a random sample of 10 students and obtained the following data. (a) Is the sampling ...(a) Compute di = Xi - Yi for each pair of data. (b) Compute d-bar and sd. (c) Test the hypothesis that µd ≠ 0 at the α = 0.01 level of signiﬁcance. (d) Compute a 95% conﬁdence interval for the population mean ...Does hypnotism result in a different success rate for men and women who are trying to quit smoking? Researchers at Science magazine analyzed studies involving 5600 male and female smokers. Of the 2800 females, 644 quit ...Construct a conﬁdence interval for p1 - p2 at the given level of conﬁdence. x1 = 368, n1 = 541, x2 = 421, n2 = 593, 90% conﬁdence
Post your question