7BOBO-dHHHHHH-dH-h-)4 - -Zl`DxHH(FG(HH(d'@.x;Cancel4lA/3FWordAcessing<% 3- -DatabaseCQ PaintingC QCommunicationsdxevStationery-xF.h9v  -|!(}DSET5%5%5ECO-L-T-Py-vy-vy-vy,ly-v y-x y-v}y-vy-vy-v)y--vvy--vy--vy--v"_y--v&y-l.v*Dy--v,.y--r/y-h-v3 y--v53y-p 123J !"efghij_`abcWXYZ[\] S T U V W X Y + , d e   , - | } & ' d e             nopqrst+,-./01lmnopqrstuvwxyz{|}2345:;<=>?@_@A`abcdVWXYZ[%&'()*+EFGpqrst#$%&'()fghijklm$%&'()*efghijklmnopqrstuv$%&'()*+,-./01]^_`a      !!!!!!!V!W!X!Y!Z![!\!v!w!x!!!!!""""""""T"U"V"W"X"Y"Z"["\"]"^"_##$$$$$$%%%%%%%%%%&&&&A&B&C&D&E&&&&&&&&&'''''((.(M(u(v((((((((((()G)H)I)J)K)L)M)g)h)i))))*******C*D++++ +!+"+#+$+%+?+@+A+j+k+l+m+n+++++++,,,, ,!,",#,$,%,&,',(,),*,+,,,-,.,,,,,-Y-Z-[-\-]-^-_-`................./d/e/f/g/h/i/j//0000000000000000000001'1(1)1*1+1,111113333 3 3 3x3y3z3{3|3}3~3333333334,4-4.4/404`4a4b4c4d4e5&5'5(5)5*5+5,5-5.5/505152535455565758595:5;5<5=5>5?5@5A5B5C5D5E [ i     _ ` f g           '  (   t m    C V   + ) m k v          !T "\ "_ %@ %E % & ' ' (w ( ( ( ( )M *B +% ,% ,. , , . / 30 33 3: 3= 4 4 4 5% 5. 5. 57 57 58 5> 5> -H-D-@ -<-8-4-0-, -($-'-+,-/,-t2-- UNIT 13: PRECISION, ACCURACY, AND TOLERANCE ODD QUESTIONS 1-39 1. Examine the recorded measurements of length and distance listed below. a. Rewrite the list on your paper, ordered from the least precise to the most precise. b. Beside each instrument in your list, indicate the greatest possible error of measurement when using that device. 3. Suppose you use the protractor shown below to measure angles. a. What is the precision of this measuring device? b. What is the greatest possible error when reading this device? c. How would you record the measurement of the angle shown so that this precision is reflected? 5. A metal plate is needed in a certain application to replace a damaged one. The specifications call for a plate that is 33/64 +/- 1/64. You locate some metal plate stock and measure its thickness with a standard micrometer, as shown below. a. What is the reading shown by the micrometer? b. What are the lower and upper limits for the specification? c. According to your measurement of the plate, is it within the tolerance interval? 7. A coring aerator can cover 5000 ft2 per hour. How long would it take to cover the greens on an 18-hole golf course, if each green averages 8000 ft2? (Report your answer with the proper precision.) What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 9. A hydraulic cylinder is used to raise a sprayer are. The output piston measures 2.5 in diameter. The pressure gage indicates a pressure of 35 pounds per square inch (psi) is being applied to the piston. a. Determine the area of the output piston, reported with the correct precision. b. Multiply the pressure by the area of the output piston to find what force is exerted by the piston. (Report your answer to reflect the precision of the input measurements.) What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 11. Identify which of the values listed below can be considered exact, and which are not exact (involving a limited amount of precision.) a. Jill traveled 575 miles on a recent business trip. b. Ann put the thermostat setting on 68o. c. Mark earned $16.22 in interest this month. d. Checkout A had $2,091.84 total sales for the previous shift. e. Second shift packaged 757 boxes. f. When the explosion occurred, the switchboard was flooded with 5000 calls. g. The new water cooler hods 5 gallons. h. The clerk said that the cost was $1.75 per line of classified ad. i. Last year there were 17 reported cases of theft. j. Inflation held steady at 4.1% during the first quarter. k. Bob owed $182.08 on his income tax return last year. l. John made 1826 bus trips last year. m. Kellys health insurance policy has a $500 deductible. 13. You are the manager of a movie theater. You charge $5 admission, except for the matinee showings, when you sell the tickets at half price. On a particular day, you sold 696 regular admission tickets and 182 matinee tickets. What is the total revenue generated from the sale of tickets? (Indicate the precision of your answer.) What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 15. A customer has ordered 24 cartons. Each carton weighs 17.4 pounds. a. What is the total weight of this order? (Round your answer to the correct number of digits.) b. Suppose you have a promotional offer where you include a small package with this order. The package weighs about 0.25 pounds. How will this affect the total weight? What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 17. Suppose your check register appears similar to that shown below. Beginning balance $1381.77 Check #1094 12.88 - Check #1095 7.00 - Deposit 5/17 300.00 + Check #1096 1157.00 - Deposit 5/22 512.56 + Check #1097 29.66 - Check #1098 48.15 - a. What is the final balance after the transactions shown above? b. Is money considered a measurement, or a count? c. Suppose the bank credits your account with an interest payment of 0.4375% of the final balance. What amount do you think the bank will credit to your account? Explain the handling of the fractional amounts. What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 19. As an insurance adjuster, you must investigate a clients carpet damage. The guideline your company uses is to authorize a replacement of the carpet if the damaged area exceeds 10% of the total carpet area. The total carpet measures 9 feet 11 inches wide and 11 feet 9 inches long. The damaged area is 19 inches wide and 9 feet long. a. Compute the total carpet area and the damaged carpet area in square inches. b. Determine the fraction of carpet area that is damaged. Express your answer as a percentage, with the correct number of significant digits. Does this  damage qualify for replacement? What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 21. You work in a doctors office and frequently give injections to patients. You use a 1-cc syringe (marked in 0.1-cc increments) for amounts 1 cc or less. For larger amounts, you use a 5-cc syringe (marked in 0.2-cc increments). What precision and greatest possible error are associated with each syringe? What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 23. You must select a pipette for use in your lab to accurately measure small amounts of solutions. Several different grades of pipettes are available, as shown below. a. Which of the pipettes advertises the highest degree of accuracy? Which advertises the lowest degree of accuracy? How do you know this? b. For the 1-ml, Grade A pipetted listed above, what are the greatest possible error and the tolerance interval for a reading of 0.8 ml? c. If your work requires small volume measurements, 5 ml or less, accurate to the nearest 0.1 ml, which pipette(s) could you choose? 25. The microscope in your lab is equipped with a movable stage with micrometer adjustment. As you determine the length of a particular speciment, you adjust the micrometer on the stage from the initial setting, shown below,to the final setting. a. Read the two micrometers shown above. How far did you move the microscope stage, that is, how long is the object you are observing? b. What is the precision of the length that you will report? 27. You work in the home improvement department of a store. You add pigment to gallon paint cans to create custom paint colors for customers. You typically add about 3/8 ounce of pigment to a gallon. a. What is the total volume of paint in the can after adding the pigment? b. Is the label still accurate in reporting 1 gallon of paint? What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 29. You consider the installation of a 300-watt security light. It will switch on at dusk and off at dawn. The length of the night in your state averages 12 hours through the course of the year. You want to determine the effect such a light might have on your electric bill. The electric company charges you about $0.12 per kilowatt-hour each month. a. Multiply the watts used each night to find the power consumed each night. How many watt-hours do you use each night? (Use the average night length and assume the advertised wattage of the light is accurate to the nearest 10 watts.) b. How much do you use through the year (use 365 nights per year)? c. Since the electric meter displays kilowatt-hours, how many kilowatt-hours used by the light would your meter reflect each night? How many each year? (Round to the correct number of significant digits.) What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 31. Below is a list of volume-measuring instruments found in a test laboratory and the smallest subdivisions marked on each instrument. Measuring instruments and subdivisions Burette w/0.05- ml divisions Beaker w/25- ml divisions Graduated cylinder w/0.2- ml divisions Beaker w/50- ml divisions Burette w/0.1- ml divisions Graduated cylinder w/1- ml divisions a. Rewrite the list on your paper, ordered from the least precise to the most precise instrument markings. b. For each instrument, what is the greatest possible error of a measurement? What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 33. A 21-quart radiator is filled with 8 quarts of antifreeze and 13 quarts of water. Express the fraction of the solution that is antifreeze as a percentage. (Round to the correct number of significant digits.) What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 35. The machining of a pin and matching hole to be force fitted are specified to have the measurements shown below. Pin 35.28 +/- 0.01 mm Hole 35.24 +/- 0.01 mm a. What are the maximum and minimum diameters for the pin and hole that are within the specified tolerance? b. Since the pin is larger than the hole, it is supposed to create a tight fit. The difference between the two diameters is called interference. What is the maximum interference tolerated by the specification, that is, the difference between the maximum pin diameter and the minimum hole diameter? What are you looking for? What do you need to answer the question? Write out the methods that you will use to solve the problem and show your work in calculating the answer(s). Your answer(s) are (make sure the units used are correct): 37. A customer suspects a water leak in the house plumbing. You examine the water meter during a time when no water is being used in the house. The figures below show the reading of the cubic-foot dial (the finest division of the meter) at the start and at the end of one hour. a. What is the precision of the water-meter dials shown in the illustration? b. How many cubic feet of water were measured during the hour, as shown by the meter? (Assume the meter did not advance more than one revolution.) c. If you assume a 30-day month (and 24 hours per day), approximately how many gallons of water are being lost each month through the leak? (Recall that 1 cubic foot is approximately equal to 7.480 gallons. Be sure to report your answer to the precision supported by your meter reading.) 39. A typical 2 by 4 is actually 1 1/2 by 3 1/2. A lift of 8-foot boards is stacked as shown below. a. Count the boards shown in the stack. What do you think the total width of the lift should be? What do you think the total height of the lift should be? b. How precisely can you report your answers? c. Suppose the height of the boards on another lift measures 23 7/8. Without counting the stack, should you be concerned about being one layer short on this lift? Explain. DSET|(H-$>"9 *6*>"9DSET(H- 9>96*=9DSETR ----   -Unit 13 Odd Questions