Reference no: EM131008548
1. A recent article in the Myrtle Beach Sun Times reported that the mean labor cost to repair a color television is $90 with a standard deviation of $22. Monte's TV Sales and Service completed repairs on two sets this morning. The labor cost for the first was $75 and it was $100 for the second. Compute z values for each and comment on your findings.
2. The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds.
a. What is the area between 415 pounds and the mean?
b. What is the area between the mean and 395 pounds?
c. What is the probability of selecting a value at random and discovering that it has a value of less than 395 pounds?
3. The monthly sales of mufflers in the Richmond, VA area follow the normal distribution with a mean of 1200 and a standard deviation of 225. The manufacturer would like to establish inventory levels such that there is only a 5% chance of running out of stock. Where should the manufacturer set the inventory levels?
4. Research on new juvenile delinquents revealed that 38% of them committed another crime.
a. What is the probability that of the last 100 new juvenile delinquents put on probation, 30 or more will commit another crime?
b. What is the probability that 40 or fewer of the delinquents will commit another crime?
c. What is the probability that between 30 and 40 of the delinquents will commit another crime?
5. An Air Force study indicates that the probability of a disaster such as the January 28, 1986 explosion of the space shuttle Challenger was 1 in 35. The Challenger flight was the 25th mission.
a. How many disasters would you expect in the first 25 flights?
b. Use the normal approximation to estimate the probability of at least one disaster in 25 missions.
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Construct x-bar and r charts based on the data
: Construct X-bar and R charts based on the data of the first 25 hours. Comment on whether the process is in control
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What is the null hypothesis
: The owner of the store from Chapter 12, Exercise 1, wants to know if the mean age of all customers is 25 years old. a) What is the null hypothesis? b) Is the alternative one- or two-sided?
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Faulkner decided to change to the straight line method
: Describe the way Faulkner should account for the change described. Include in your answer any journal entry Faulkner will record in 2011 related to the change and any required footnote disclosures.
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Computer model had warranty problems
: For each of the following, write out the alternative hypothesis, being sure to indicate whether it is one-sided or two-sided. a) Consumer Reports discovered that 20% of a certain computer model had warranty problems over the first three months. ..
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How many disasters would you expect in the first flights
: An Air Force study indicates that the probability of a disaster such as the January 28, 1986 explosion of the space shuttle Challenger was 1 in 35. The Challenger flight was the 25th mission. How many disasters would you expect in the first 25 flig..
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Compute depletion and depreciation of the mine
: Compute depletion and depreciation of the mine and the mining facilities and equipment for 2011 and 2012. Marion uses the units-of-production method to determine depreciation on mining facilities and equipment.
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Identify a broad problem area and define problem statement
: Formulate a field work research project and design research instruments such as questionnaires and interview schedules and employ statistical software to conduct inferential statistical analytical procedures, and set up and solve a regression model.
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Prepare any journal entry necessary as a direct result
: Prepare any journal entry necessary as a direct result of the change as well as any adjusting entry for 2011 related to the situation described.
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Inventory management in manufacturing organizations
: The inventory management has lots of challenges and it requires proper planning and execution of adopted processes and technologies to manage it in an efficient way - Inventory management in manufacturing organizations.
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