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new bus route.......
A new bus route has been established between downtown Denver and Englewood,...
A comparison is made between two bus lines to determine if arrival times of their regular...
A comparison is made between two bus lines to determine if
arrival times of their regular buses from Denver to Durango are off
schedule by the same amount of time. For 51 randomly selected runs,
bus line A was observed to be off schedule an average time of 53
minutes, with standard deviation 19minutes. For 61 randomly
selected runs, bus line B was observed to be off schedule an
average of 62 minutes, with standard deviation 15 minutes. Do the...
A metropolitan transportation authority has set a bus mechanical reliability goal of 3800 bus miles. Bus...
A metropolitan transportation authority has set a bus mechanical reliability goal of 3800 bus miles. Bus mechanical reliability is measured specifically as the number of bus miles between mechanical road calls. Suppose a sample of 100 buses resulted in a sample mean of 3825 bus miles and a sample standard deviation of 225 bus miles. Complete parts (a) and (b) below. a. Is there evidence that the population mean bus miles is more than 3800 bus miles? (Use a 0.05...
A random sample of n, - 11 winter days in Denver gave a sample mean pollution...
A random sample of n, - 11 winter days in Denver gave a sample mean pollution Index x - 43. Previous studies show that 0,- 14. For Englewood (a suburb of Denver), a random sample of n, - 17 winter days gave a sample mean pollution Index of xy - 51. Previous studies show that 0, - 16. Assume the pollution Index is normally distributed in both Englewood and Denver, Do these data indicate that the mean population pollution index...
Assuming an experiment has k categories, the goodness-of-fit test statistic is assumed to follow a normal...
Assuming an experiment has k categories, the goodness-of-fit test statistic is assumed to follow a normal distribution with (k-1) degrees of freedom. True False Question 6 1 pts The Boston public school district has had difficulty maintaining on-time bus service for its students. 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, 10 minutes late. After the schedule adjustment, the...
USA Today reported that the population mean life span of people who live in Hawaii is...
USA Today reported that the population mean life span of people who live in Hawaii is 77 years. A random sample of 20 obituary notices gave a sample mean life span of ?̅= 71.4 years and a sample standard deviation s = 20.65 years. Assuming that the life span of people in Hawaii is normally distributed, does this indicate that the population mean life span is less than 77 years? Use a 5% level of significance. a.) What is α?...
1. Recall that a bank manager has developed a new system to reduce the time customers...
1. Recall that a bank manager has developed a new system to reduce the time customers spend waiting for teller service during peak hours. The manager hopes the new system will reduce waiting times from the current 9 to 10 minutes to less than 6 minutes. Suppose the manager wishes to use the random sample of 100 waiting times to support the claim that the mean waiting time under the new system is shorter than six minutes. a. Letting μ...
1. A manufacturer claims that the mean lifetime of its lithium battery is 1000 hours. A...
1. A manufacturer claims that the mean lifetime of its lithium battery is 1000 hours. A homeowner selects 40 batteries and finds the mean lifetime to be 990 hours with a standard deviation of 80 hours. Test the manufacturer's claim. Use alpha = 0.05. a. Calculate the test statistics. test statistics= (Round your answer to the nearest hundredth) Answer is not 0.79 or 0.80 2. A local juice manufacturer distributes juice in bottles labeled 12 ounces. A government agency thinks that...
11. (13 pts) A systems specialist has studied the work-flow of clerks who do the same...
11. (13 pts) A systems specialist has studied the work-flow of clerks who do the same inventory work. Based on this study, she designed a new work-flow layout for the inventory system. To compare average production for the old and new methods, she took a random sample of six clerks. The average production rate number of inventory items processed per shift) for each clerk was measured both before and after the new system was introduced. The results are shown below....
A manager of a pizza restaurant has changed the restaurant's delivery process in an effort to...
A manager of a pizza restaurant has changed the restaurant's delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 30 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 27.3 minutes and a sample standard deviation of 6 minutes. Complete parts (a) through (d) below. a. Using the critical value approach, at the 0.05 level of significance, is there evidence that the...
In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of...
In this problem, assume that the distribution of differences is approximately normal. Note: For degrees of freedom d.f. not in the Student's t table, use the closest d.f. that is smaller. In some situations, this choice of d.f. may increase the P-value by a small amount and therefore produce a slightly more "conservative" answer. Is fishing better from a boat or from the shore? Pyramid Lake is located on the Paiute Indian Reservation in Nevada. Presidents, movie stars, and people...
A comparison is made between two bus lines to determine if
arrival times of their regular buses from Denver to Durango are off
schedule by the same amount of time. For 51 randomly selected runs,
bus line A was observed to be off schedule an average time of 53
minutes, with standard deviation 19minutes. For 61 randomly
selected runs, bus line B was observed to be off schedule an
average of 62 minutes, with standard deviation 15 minutes. Do the...
A random sample of n, - 11 winter days in Denver gave a sample mean pollution Index x - 43. Previous studies show that 0,- 14. For Englewood (a suburb of Denver), a random sample of n, - 17 winter days gave a sample mean pollution Index of xy - 51. Previous studies show that 0, - 16. Assume the pollution Index is normally distributed in both Englewood and Denver, Do these data indicate that the mean population pollution index...
Assuming an experiment has k categories, the goodness-of-fit test statistic is assumed to follow a normal distribution with (k-1) degrees of freedom. True False Question 6 1 pts The Boston public school district has had difficulty maintaining on-time bus service for its students. 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, 10 minutes late. After the schedule adjustment, the...
11. (13 pts) A systems specialist has studied the work-flow of clerks who do the same inventory work. Based on this study, she designed a new work-flow layout for the inventory system. To compare average production for the old and new methods, she took a random sample of six clerks. The average production rate number of inventory items processed per shift) for each clerk was measured both before and after the new system was introduced. The results are shown below....
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