Question: In conducting her annual review of suppliers a purchasing agent
In conducting her annual review of suppliers, a purchasing agent has collected data on a sample of orders from two of her company’s leading vendors. On average, the 24 shipments from company 1 have arrived 3.4 days after the order was placed, with a standard deviation of 0.4 days. The 30 shipments from company 2 arrived an average of 3.6 days after the order was placed, with a standard deviation of 0.7 days. The average time for shipments to be received is about the same, regardless of supplier, but the purchasing agent is concerned about company 2’s higher variability in shipping time. Using the 0.025 level of significance in a one-tail test, should the purchasing agent conclude that company 2’s higher standard deviation in shipping times is due to something other than chance?
Relevant QuestionsA researcher has observed independent samples of females and males, recording how long each person took to complete his or her shopping at a local mall. The respective times, in minutes, are listed in file XR11072. Using the ...A compressor manufacturer is testing two different designs for an air tank. Testing involves pumping air into a tank until it bursts, then noting the air pressure just prior to tank failure. Four tanks of design A are found ...For a sample of 48 finance majors, the average time spent reading each issue of the campus newspaper is 19.7 minutes, with a standard deviation of 7.3 minutes. The corresponding figures for a sample of 40 management ...A pharmaceutical manufacturer has come up with a new drug intended to provide greater headache relief than the old formula. Of 250 patients treated with the previous medication, 130 reported “fast relief from headache ...A company that makes an athletic shoe designed for basketball has stated in its advertisements that the shoe increases the jumping ability of players who wear it. The general manager of a professional team has conducted a ...
Post your question