If the distribution of employee job service duration at Mama Jens stores is symmetrical with typical...
If the distribution of employee job service duration at Mama Jens stores is symmetrical with typical employee staying there for 5.5 years on average with standard deviation of 1.2 years, than 68% of employees will stay on the job from ___________________to ________________years.
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If the distribution of employee job service duration at Mama
Jens stores is symmetrical with typical...
Jobs and productivity! How do retail stores rate? One way to answer this question is to examine annual profits per employee. The following data give annual profits per employee (in units of 1 thousand...
Jobs and productivity! How do retail stores rate? One way to answer this question is to examine annual profits per employee. The following data give annual profits per employee (in units of 1 thousand dollars per employee) for companies in retail sales. Assume σ ≈ 3.9 thousand dollars. 3.5 6.9 4.0 9.0 7.5 6.0 8.6 6.3 2.6 2.9 8.1 −1.9 11.9 8.2 6.4 4.7 5.5 4.8 3.0 4.3 −6.0 1.5 2.9 4.8 −1.7 9.4 5.5 5.8 4.7 6.2 15.0 4.1...
Jobs and productivity! How do retail stores rate? One way to answer this question is to examine annual profits per employee. The following data give annual profits per employee (in units of one thousa...
Jobs and productivity! How do retail stores rate? One way to answer this question is to examine annual profits per employee. The following data give annual profits per employee (in units of one thousand dollars per employee) for companies in retail sales. Assume σ ≈ 4.1 thousand dollars. 3.7 6.8 3.5 8.7 8.5 5.3 8.8 5.9 2.6 2.9 8.1 −1.9 11.9 8.2 6.4 4.7 5.5 4.8 3.0 4.3 −6.0 1.5 2.9 4.8 −1.7 9.4 5.5 5.8 4.7 6.2 15.0 4.1...
Metropolitan Bakery is a small chain of bakery stores based in Philadelphia, PA. Managing performance is...
Metropolitan Bakery is a small chain of bakery stores based in Philadelphia, PA. Managing performance is an important role for a company that spends little in advertising and relies largely on word-of-mouth promotion. Employees at Metropolitan categorically must meet two standards: they must avoid no-call/no-shows and they must never be rude to customers. The company conducts performance appraisals on a regular basis; however managers tend to prefer less formal avenues such as offering feedback on-the-spot. Which performance standard is James...
0.In a normal distribution, plus and minus 2 standard deviations from the mean will include about...
0.In a normal distribution, plus and minus 2 standard deviations from the mean will include about what percent of the observations? A) 50% B) 99.7% C) 95% D)68% 21. What is the area under the normal curve between z -0.0 and z-2.0 A) 1.0000 B) 0.7408 C) 0.1359 D) 0.4770 22. Which of the following is NOT a characteristic of the normal probability distribution? A) Positively-skewed B) Bell-shaped C) Symmetrical D) Mean Mode and median are all equal 23. A...
The distribution of times that a company's service technicians take to respond to trouble calls is...
The distribution of times that a company's service technicians take to respond to trouble calls is normal with mean μ and standard deviation 0.25 hours. The company advertises that its service technicians take an average of 2 hours to respond to trouble calls from customers. We suspect that the average time is really more than 2 hours. From a random sample of 25 trouble calls, the average time service technicians took to respond was 2.10 hours. How strong is the...
The t statistic, the t distribution, and sample size The average duration of labor from the...
The t statistic, the t distribution, and sample size
The average duration of labor from the first contraction to the birth of the baby in women over 35 who have not previously given birth and who did not use any pharmaceuticals is 16 hours. Suppose you have a sample of 35 women who exercise daily, and who have an average duration of labor of 16.9 hours and a sample variance of 39.7 hours. You want to test the hypothesis that...
A simple random sample of 100 postal employees is used to test if the average time...
A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was x = 7 years with a standard deviation of s = 2 years. Assume the distribution of the time the employees have worked for the postal service is approximately Normal. The hypotheses being tested are H0: ! = 7.5 versus...
-/5 POINTS MINTROSTAT9 7.E.521.XP. MY NOTES ASK YOUR TEACHER A simple random sample of 100 postal...
-/5 POINTS MINTROSTAT9 7.E.521.XP. MY NOTES ASK YOUR TEACHER A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was 7 years with a standard deviation of 2 years. Assume the distribution of the time the employees have worked for the postal service is approximately normal. The hypotheses being tested are...
Consolidated Distribution Recall from lecture the example of direct delivery versus consolidated distribution. In the direct...
Consolidated Distribution Recall from lecture the example of direct delivery versus consolidated distribution. In the direct delivery scenario, a single supplier ships directly to 100 retail stores with an 8-week lead time to each store. Each retail store faces normally distributed customer demand with a mean of 2 units/month and a standard deviation of 1.41 units/month (assume 4 weeks in a month). In the consolidated distribution scenario, the supplier ships directly to a regional distribution center (DC), which then ships...
Determine why a hypothesis test should not be run on the following samples: A restaurant wants to show that its customer service rating is better than the ratings on Yelp. Currently they have 3.2...
Determine why a hypothesis test should not be run on the following samples: A restaurant wants to show that its customer service rating is better than the ratings on Yelp. Currently they have 3.2 stars out of 5. A small set of survey cards are left at tables for customers to fill out and rate the service if they like. Results from 230 customers shows an average rating of 3.7 stars out of 5, with a standard deviation of 0.6...
Metropolitan Bakery is a small chain of bakery stores based in Philadelphia, PA. Managing performance is an important role for a company that spends little in advertising and relies largely on word-of-mouth promotion. Employees at Metropolitan categorically must meet two standards: they must avoid no-call/no-shows and they must never be rude to customers. The company conducts performance appraisals on a regular basis; however managers tend to prefer less formal avenues such as offering feedback on-the-spot. Which performance standard is James...
0.In a normal distribution, plus and minus 2 standard deviations from the mean will include about what percent of the observations? A) 50% B) 99.7% C) 95% D)68% 21. What is the area under the normal curve between z -0.0 and z-2.0 A) 1.0000 B) 0.7408 C) 0.1359 D) 0.4770 22. Which of the following is NOT a characteristic of the normal probability distribution? A) Positively-skewed B) Bell-shaped C) Symmetrical D) Mean Mode and median are all equal 23. A...
The distribution of times that a company's service technicians take to respond to trouble calls is normal with mean μ and standard deviation 0.25 hours. The company advertises that its service technicians take an average of 2 hours to respond to trouble calls from customers. We suspect that the average time is really more than 2 hours. From a random sample of 25 trouble calls, the average time service technicians took to respond was 2.10 hours. How strong is the...
The t statistic, the t distribution, and sample size
The average duration of labor from the first contraction to the birth of the baby in women over 35 who have not previously given birth and who did not use any pharmaceuticals is 16 hours. Suppose you have a sample of 35 women who exercise daily, and who have an average duration of labor of 16.9 hours and a sample variance of 39.7 hours. You want to test the hypothesis that...
-/5 POINTS MINTROSTAT9 7.E.521.XP. MY NOTES ASK YOUR TEACHER A simple random sample of 100 postal employees is used to test if the average time postal employees have worked for the postal service has changed from the value of 7.5 years recorded 20 years ago. The sample mean was 7 years with a standard deviation of 2 years. Assume the distribution of the time the employees have worked for the postal service is approximately normal. The hypotheses being tested are...
Consolidated Distribution Recall from lecture the example of direct delivery versus consolidated distribution. In the direct delivery scenario, a single supplier ships directly to 100 retail stores with an 8-week lead time to each store. Each retail store faces normally distributed customer demand with a mean of 2 units/month and a standard deviation of 1.41 units/month (assume 4 weeks in a month). In the consolidated distribution scenario, the supplier ships directly to a regional distribution center (DC), which then ships...
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