The manager of an auto repair shop has collected data on the time to do a...
The manager of an auto repair shop has collected data on the time to do a standard repair on the 2003 model of a Honda Civic. From the sample of 40, the mean time do the repair was 122.4 minutes; the standard deviation 16.7 minutes.
(a) Calculate a 95% confidence interval for the mean time to do the repair.
(b) The quoted time for the repair is given by Honda Canada as 128 minutes (based on data from the 2001 model). Is the time for the repair significantly less for the 2003 model? Formally set up the appropriate hypotheses and test at a 5% significance level.
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The manager of an auto repair shop has collected data on the
time to do a...
2. The manager of an auto repair shop has collected data on the time to do...
2. The manager of an auto repair shop has collected data on the time to do a standard repair on the 2003 model of a Toyota Echo. From the sample of 40, the mean time do the repair was 122.4 minutes, the population standard deviation 16.7 minutes. We assume the time follows the normal distribution. a) Calculate a 95% confidence interval for the mean time to do the repair. b) The quoted time for the repair is given by Toyota...
Q410 pts].An appliance manufacturer wants to contract with a repair shop to ed repairs in Indianapolis. The of repair time of 55 minutes to 95 minutes. Two firms have submitted bids for the work. In...
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The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Job Standard Hours: 3.00, Standard Rate: $7.00, Standard Cost: $21.00. The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 250 tune-ups were completed during the week, and the controller recalls the following variance data...
An automotive repair shop has determined that the average service time on an automobile is 2...
An automotive repair shop has determined that the average service time on an automobile is 2 hours with a standard deviation of 32 minutes. A random sample of 64 services is selected. a. What is the probability that the sample of 64 will have a mean service time greater than 114 minutes? Assume the population consists of 400 services. Determine the standard error of the mean. C. What is the probability that the sample of 64 will have a mean...
The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Job Standard Hours Standard Rate Standard Cost Motor tune-up 2.10 $6.50 $13.65 The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 140 tune-ups were completed during the week, and the controller...
The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Standard Hours Standard Rate Standard Cost Motor tune-up 2.50 $25.00 $62.50 The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 50 tune-ups were completed during the week, and the controller recalls the following variance...
The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Standard Hours Standard Rate Standard Cost Motor tune-up 2.50 $32.00 $80.00 The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 52 tune-ups were completed during the week, and the controller recalls the following variance...
The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Job: Motor tune-up Standard Hours: 2.6 Standard Rate: $4.0 Standard cost: $10.4 The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 180 tune-ups were completed during the week, and the controller recalls the following...
The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Standard Hours Standard Rate Standard Cost Motor tune-up 2.50 $30.00 $75.00 The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 50 tune-ups were completed during the week, and the controller recalls the following variance...
The auto repair shop of Quality Motor Company uses standards to control the labor time and...
The auto repair shop of Quality Motor Company uses standards to control the labor time and labor cost in the shop. The standard labor cost for a motor tune-up is given below: Standard Hours Standard Rate Standard Cost Motor tune-up 2.50 $31.00 $77.50 The record showing the time spent in the shop last week on motor tune-ups has been misplaced. However, the shop supervisor recalls that 56 tune-ups were completed during the week, and the controller recalls the following variance...
2. The manager of an auto repair shop has collected data on the time to do a standard repair on the 2003 model of a Toyota Echo. From the sample of 40, the mean time do the repair was 122.4 minutes, the population standard deviation 16.7 minutes. We assume the time follows the normal distribution. a) Calculate a 95% confidence interval for the mean time to do the repair. b) The quoted time for the repair is given by Toyota...
Q410 pts].An appliance manufacturer wants to contract with a repair shop to ed repairs in Indianapolis. The of repair time of 55 minutes to 95 minutes. Two firms have submitted bids for the work. In test trials, one firm had a mean repair time of 73 minutes with a standard deviation of 4.2 minutes and the other firm had a mean repair time of 72 minutes with a standard deviation of 5.7 minutes. Which firm would you choose and why?...
An automotive repair shop has determined that the average service time on an automobile is 2 hours with a standard deviation of 32 minutes. A random sample of 64 services is selected. a. What is the probability that the sample of 64 will have a mean service time greater than 114 minutes? Assume the population consists of 400 services. Determine the standard error of the mean. C. What is the probability that the sample of 64 will have a mean...
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