Question: The foreman at an assembly plant is concerned that the
The foreman at an assembly plant is concerned that the number of defective items produced on the night shift seems to be higher than during the day shift. A random sample of 45 night shifts had an average of 35.4 defects, with a standard deviation of 15.3. A random sample of 50 day shifts had an average of 27.8 defects, with a standard deviation of 7.9.Is there sufficient evidence, at the 5% significance level, to indicate that the number of defects is higher on the night shift than on the day shift? You may assume that the population distributions of errors are normally distributed.
Relevant QuestionsA restaurant asked a random sample of its weeknight customers to rate their food on the following scale: 1––excellent, 2––good, 3––fair, 4––poor, 5––awful. Another random sample of weekend diners was ...A bank with a management training program is considering promotion of one of two trainees in the Metro West division. The bank has asked for feedback for each of the trainees (that is, feedback from managers and peers). The ...One of the criteria statistics professors use to select a textbook is the number of exercises provided. One particular topic in statistics is selected: the t-test of the mean. A random sample of 15 professors is asked how ...Suppose you are conducting a Wilcoxon Rank Sum Test to determine if population 1 is to the right of population 2. You have two samples of size 10. W1 = 78. What does this tell you? A random sample of 55 Canadian men aged 25 to 54 were asked to keep a daily log of the hours spent doing unpaid work around the home. The time was averaged over the week. The survey was conducted in 2000 and 2009. In 2000, ...
Post your question