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The Boston public school district has had difficulty maintaining on-time bus service for its students ("A Year Later, School Buses Still Late," Boston Globe, October 5, 2011). Suppose the district develops a new bus schedule to help combat chronic lateness on a particularly woeful route. Historically, the bus service on the route has been, on average, 12 minutes late. After the schedule adjustment, the first 36 runs were an average of 8 minutes late. As a result, the Boston public school district claimed that the schedule adjustment was an improvement-students were not as late. Assume a population standard deviation for bus arrival time of 12 minutes.
Develop the null and alternative hypotheses to determine whether the schedule adjustment reduced the average lateness time of 12 minutes.
1-state whetherbeach othe following true or false and explain whya a high negative correlation value for example p-.95
A certain component is critical to the operation of medical device and must be replaced immediately upon failure. If the mean lifetime of this type of component is 100 hours and its standard deviation is 30 hours, how many of these components must..
While 3% of the cellular calls with company B will have interference. Given that a randomly selected cellular call is that has interference, what is the probability it came from company A.
in a study subjects are randomly assigned to one of three groups control experimental a or experimental b. after
Develop percent frequency distribution and construct bar chart and pie chart.
the null hypothesis is to be tested at 95% confidence. Determine the critical value(s) for this test.
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We desire to test at 0.05 level of significance whether modification increases the life of battery. What is our decision rule? Reject null hypothesis if calculated t is less than 1.96.
suppose that a pharmaceutical company wants to claim that side effects will be experienced by fewer than 20 of the
according to cnn business partner careerbuilder.com the average starting salary for accounting graduates in 2008 was at
A psychology professor is interested in whether implementing weekly quizzes improves student learning. She decides to use the weekly quizzes in one section of her introductory psychology class and not to use them in another section of the same cou..
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