At Food Corporation, it took an average of 50 minutes for new workers to learn a...
At Burger Queen outlet it took 40 minutes for a customer to place an order and receive the meal. The Company decided to restructure its operations. The manager would like to find out if the mean time taken in the new system is different from 40 minutes. A sample of 38 orders showed that it took, on average, 37 minutes to complete the orders with a standard deviation of 7 minutes. Find the p-value for the test that the mean...
the average length of time for students to register for fall classes at a certain college has been 50 minutes. a new registration procedure using modern computing machine is being tried. if a random sample of 12 students had an average registration time of 42 minutes with a standard deviation of 11.90 minutes under the new system, test the hypothesis that the population mean is now less than 50 using:a. 0.05 level of significance and b. 0.01 level of significance.
nswer the following TWO questions uestion (1) (30 Marks A) (5 Marks) The time required to build a computer is normally distributed with a mean of 50 minutes and a standard deviation of 10 minutes. What is the probability that a computer is assembled in a time between 45 and 60 minutes? B) (5 Marks) It was noted that the amount of oil in each "32-ounce" bottle is actually a normally distributed random variable, with a mean of 32.2 ounces...
2. In making aluminum castings into alternator housings, an average of 3.5 ounces per casting must be trimmed off and recycled as a raw material at the DAVID remanufacturing plant. A new manufacturing procedure has been proposed to reduce the amount of aluminum that must be recycled in this way. For a sample of 11 castings made with the new process the sample mean is 3.043 and sample standard deviation is 0.507. Using an appropriate hypothesis test, does the new...
4) The ABC Company has recently replaced a machine critical to their manufacturing process. The average time for a worker to complete a certain task using the old machine was 16 mins. The times to complete the task using the machine are normally distributed with standard deviation 9 mins. The company wants to test if the average time to complete the task using the new machine has changed (i.e., is different). To this end, they timed 25 workers using the...
Question 2 A local fast food restaurant pays $5 per hour to workers and $50 per hour to rent ovens and other kitchen machinery. The restaurant uses seven hours of worker time per unit of machinery time. a. i. Determine whether the restaurant is minimizing its cost of production when the ratio of ii. Do you suggest any adjustment to improve the efficiency in the resource use? A cosmetic company produces skin cream bottles in its local store. The company...
uestion (1) (30 Marks A) 5 Marks) The time required to build a computer is normally distributed with a mean of 50 minutes and a standard deviation of 10 minutes. What is the probability thata computer is assembled in a time between 45 and 60 minutes? B) (5 Marks) t was noted that the amount of oil in each "32-ounce" bottle is actually a normally distributed random variable, with a mean of 32.2 ounces and a standard deviation of 0.3...
You are the manager of a restaurant for a fast-food franchise. Last month, the mean waiting time at the drive-through window for branches in your geographical region, as measured from the time a customer places an order until the time the customer receives the order, was 3.7 minutes. You select a random sample of 81 orders. The sample mean waiting time is 3.93 minutes, with a sample standard deviation of 0.9 minute. Complete parts (a) and (b) below. a. At...
Please help me with my whole assigment 1. [7 marks in total] A statistics practitioner took a random sample of 31 observations from a normal population. The sample standard deviation is 34 and the sample mean is 97. Note: For each confidence interval, enter your answer in the form (LCL", UCL"). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Diagram Confidence interval B. Estimate the population mean with...
For each of the problems below perform an hypothesis test. State the null and alternative hypothesis, the p-value and your conclusion in context of the problem. Perform each test at a .05 significance. 1. A manufacturer of a plasticised line used in home-assembly mobiles advertises that their product has an average tensile strength of 30 kilograms (this is a measure of how strong the product is). You took a sample of 144 sections of the line and tested them. The...