A manufacturer of television tubes has two types of tubes, A and B, respectively, the tubes have mean lifetimes of xA = 1495 hours and xB = 1875 hours, and standard deviation of SA = 280 hours and SB =

6,053 results
  1. science

    Which statement accurately describes test tubes and beakers?(1 point)

  2. math: Algebra

    Three cylindrical tubes with with a 12 in diameter are strapped together by a plastic band. How long is the band?Suppose that four of the same tubes are strapped together with a snugly fitting plastic band how long is the band?

  3. Chemistry

    Three colorless solutions in test tubes, with no labels, are in a test tube rack on the lab bench. Lying beside the test tubes are three labels: potassium iodide, KI, silver nitrate, AgNO3, and sodium sulfide, Na2S. You are to place the labels on the test

  4. physical science

    suppose one of your test tubes ha a capacity of 23 mL. you need to use about 5 mL. of a liquid. describe how you could estimate 5 mL

  5. Science

    Jaquan put 5 mL of water into three test tubes and five of them of acid into two tubes. He places all the test tubes and the rack. What is hir error?

  6. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a

  7. Check This Statistics Homework

    1.) Based on a survey of a few thousand people, a newspaper reporter wants to draw conclusions about how a country’s citizens in general feel about the war in Iraq. At this point, is the reporter mainly concerned with data production, displaying and

  8. Chem

    Depending upon the tip of a dropper pipet, there are approximately 20 drops per milliliter of water. The experimental procedure indicates the addition of 5-10 drops of each solution to the test tubes. Calculate the volume range in milliliters for the

  9. science

    im a series of tubes found through out the cell i transport proteins and other things as well what am i

  10. MATHEMATICS

    A manufacturer of television tubes has two types of tubes, A and B, respectively, the tubes have mean lifetimes of xA = 1495 hours and xB = 1875 hours, and standard deviation of SA = 280 hours and SB = 310 hours. Which tube has the greater (a)

  11. Math Help!

    1.) Solve the system by graphing. You may use paper or a calculator. 2x - y = 8 x + 3y = 11 2.) The revenue for a certain brand of toothpaste is y = 2.5x where 'x' is the number of tubes of toothpaste sold and 'y' is the total income for selling 'x' tubes.

  12. business statitics

    a) The mean lifetime of a sample of 100 light tubes produced by a company is found to be 1570 hours with standard deviation of 80 hours. Test the hypothesis that the mean lifetime of the tubes produced by the company is 1600 hrs. (7 marks)

  13. Business statistics

    The lifetimes of Triple X TV Tubes are approximately normally distributed with mean 13.2 years and standard deviation 3.5 years. Consider the distribution of sample means for all samples of 100 Triple X TV tubes. Part A What is the standard error, to two

  14. math

    Catherine has $54. She plans to spend more than $20 of the money for a painting canvas. The rest will go toward paints. Each tube of paint costs $8.50. Assume that x represents the number of tubes of paint Catherine can buy

  15. Physics

    I have to do a lab on cathode ray tubes. Can you explain to me how the cathode ray tubes work? And can you mention the voltages involved, what they do, and what effect varying these voltages has on the electron beam.

  16. health

    Which structures are at the end of the smallest tubes in the lungs?

  17. Residensia secondary school

    formulate a hypothesis for this investigation of to determine wether expired air contains carbon dioxide. Apparatus are two beakers/ test tubes/straws,two drinking straws and clear lime water

  18. Science

    explain why the speed and direction of sugar solution moving in the phloem tubes

  19. 9th Grade Biology

    You set up 5 samples that contained a range of sucrase concentrations but the same amount of substrate (sucrose). - The pH was kept constant in all tubes buy using the same amount of buffer. - The temperature was kept constant in all tubes (room temp) - A

  20. Biology

    Why must the test tubes be thoroughly cleaned and dried when one part of the procedure is completed, before starting the next part of the procedure?

  21. Math

    1.) Solve the system by graphing. You may use paper or a calculator. 2x - y = 8 x + 3y = 11 2.) The revenue for a certain brand of toothpaste is y = 2.5x where 'x' is the number of tubes of toothpaste sold and 'y' is the total income for selling 'x' tubes.

  22. health

    Which of the following structures are tubes? A. Frontal, maxillary, sphenoidal, ethmoidal B. Eustachian, pharynx, bronchi C. Cilia, adenoids, mucous, epiglottis D. Apex, base, hilum

  23. HELP PLEASE?!!

    Circulatory systems of animals transport nutrients to tissues. Which system of plants performs a similar function? starch granules xylem and phloem tubes stomata apical meristems plant hormone system

  24. Physics

    There are two tubes that are identical except for their slightly different lengths. Both tubes have one open end and one closed end. A speaker connected to a variable frequency generator is placed in front of the tubes. The speaker is set to produce a note

  25. Chemistry

    one morning you are given 3 test tubes of aqueous solutions of compound X: the "A" tube was set up as unsaturated, while "B" was set up as Saturated in a beaker, then poured of into the tube, and "C" was carefully set up as supersaturated. At lunchtime,

  26. physics

    During a plane flight, a passenger experiences ear pain due toa head cold that has clogged his Eustachian tubes. Assumingthe pressure in his tubes remained at 1.00 atm (from sea level) andthe cabin pressure is maintained at 0.900 atm, determine the

  27. SCi - help

    in the lungs the tubes branch into what tubes

  28. statistics

    The mean lifetime of a sample of 100 light tubes is 1570 hours with a standard deviation of 80 hours test the hypothesis that the mean lifetime of the tubes is 1600 hours

  29. Algebra

    Josh has $40 and wants to buy tubes of paint that cost $2 each. How many tubes of paint can he buy and still have at least $23 left over for canvas

  30. statistics

    The mean lifetime of a sample of 100 light tubes produced by a company is found to be 1570 hours with standard deviation of 80 hours. Test the hypothesis that the mean lifetime of the tubes produced by the company is 1600 hrs

  31. physics

    Decide whether each of the following statements are T-True, or F-False. A) Velocity anti-nodes of standing air waves occur at closed ends of tubes. B) Pressure nodes of standing air waves occur at closed ends of tubes. C) Velocity nodes of standing air

  32. REPOST URGENT!! PLEASE ANSWER

    I was just wondering, since cathode ray tubes arent being made, are the only types of TVs available the plasma and the LCD?

  33. Physics

    I was just wondering, since cathode ray tubes arent being made, are the only types of TVs available the plasma and the LCD?

  34. smoking!

    4. Cigarette smoke has been found to have the following effects on the respiratory system. 1. There is destruction of many of the cilia that line parts of the respiratory tract. 2. There is a thickening of the walls of the bronchioles, thus reducing the

  35. science please help

    So I have to do this project on simple machines. The invention we need to make should have at least 2 simple machines on it. We also have to draw it on posterboard and write a paragraph about it. One more thing is that it must make a person's life easier

  36. lab!

    Use the following description of an experiment to answer the questions. A mixture was made of water and egg white (albumin). Upon heating, the mixture coagulated. The following tests were then performed on the coagulated mixture. Test Tube 1 The mixture is

  37. chemistry

    Hello, I have data here: tube # Contents Initial color (after 2 drops of universal indicator) Color after adding HCl Color after adding NaOH (after the HCl had been poured) 1 CO32-/HCO3- Dark purple Purple Purple 2 CO32-/HCO3- Dark purple -- -- 3 HCH3CO2/C

  38. chemistry

    Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

  39. Science

    What cell has a series of tubes found throughout the cell and transports protiens and other things as well? Please help!! Thank you....

  40. Statistics

    On average 3 % of a certain type of TV tube burn out before their guarantee has expired. If a merchant sells 120 such tubes, find the probability that he will be forced to replace at least 3 of them (Use the Poisson approximation to the Binomial

  41. biology

    an animal has a segmented body, soft fleshy skin, an open circulatory system, it breaths with tiny tubes and openings, and does not have legs or antennae. How would this organism need to change to become an arthropod?

  42. common sense question, i just dont know how to ans

    Why must the test tubes be thoroughly cleaned and dried when one part of the procedure is completed before starting the next part of the procedure ? Please help me with this, thankyou so much!

  43. Chemistry

    Need help with this lab: (sorry so long) Hypothesis: The amount of product will be regulated by the limiting reactant. Procedure: First, I took two test tubes from the Glassware shelf. I added 6 mL of the copper sulfate solution to one, and 6 mL of the

  44. Health Anatomy

    Male Anatomy: What is Sterility in a Male Anatomy? and also Seminal vesicle? Female Anatomy: What are the Fallopian Tubes and Endometrium? Definitions please...

  45. algebra

    10 people are going canoeing/tubing. some people will tube, some will canoe. tubes are $7 each. canoes are $11 each. tubes hold one person. canoes hold three. if you want to spend exactly $50, how many canoes and tubes can you buy? i know this is a linear

  46. Math ~~

    Reilly used 1 and 7/10 tubes of paint to paint a model. He used 2 and 3/8 tubes to finish an art project. How many tubes did he use in total ?

  47. math

    10 people are going canoeing/tubing. some people will tube, some will canoe. tubes are $7 each. canoes are $11 each. tubes hold one person. canoes hold three. if you want to spend exactly $50, how many canoes and tubes can you buy? what would be the

  48. biology

    You have isolated the genome from a novel virus and would like to determine its composition. you have three tubes, each containing one of these substance: 1. a protein that degrades double stranded DNA (DNase, tube 1) 2. a protein that degrades single

  49. Microbiology

    2 ml of stock antibiotic (64 mg/ml) was diluted into a test tube containing 2 ml of broth (final volume is 4). A series of 2-fold SERIAL DILUTIONS were performed by transferring 2 ml to three other tubes, consecutively (final volumes now 2 ml in each

  50. Science

    2 ml of stock antibiotic (64 mg/ml) was diluted into a test tube containing 2 ml of broth (final volume is 4). A series of 2-fold SERIAL DILUTIONS were performed by transferring 2 ml to three other tubes, consecutively (final volumes now 2 ml in each

  51. Chemistry

    2 ml of stock antibiotic (64 mg/ml) was diluted into a test tube containing 2 ml of broth (final volume is 4). A series of 2-fold SERIAL DILUTIONS were performed by transferring 2 ml to three other tubes, consecutively (final volumes now 2 ml in each

  52. Microbiology

    Why are fermentation tubes evaluated at 24 and 48 hrs? If an organism oxidatively metabolizes glucose, what will occur in the fermentation tubes?

  53. serial dilutions

    label 5 tubes 1-5. Ad 1.50 ml of diluent to each tube. to the first tube, add 500 ul of 1.00 M glucose and mix. transfer 500 ul from the first tube to the second tube and mix. similarly, continue to transfer 500l from each of the remaining tubes to the

  54. Reggio Emilia Schools Question

    Dan is working on a project. He wants to build a tunnel for his cars. Dan cannot get the paper tubes to fit together and stay. In the Reggio Emilia school, his teacher will probably: 1.Ask Dan to explain his reasoning for selecting paper tubes to use for

  55. physics

    Water is shooting at the same speed out of the three tubes placed on the ground at different angles of 60°, 45°, and 30° to the horizon. Find the ratio of the greatest heights the streams can reach and the ratio of distances from the mouths of the tubes

  56. physics

    Human blood contains plasma, platelets, and blood cells. To separate the plasma from other components, centrifugation is used. Effective centrifugation requires subjecting blood to an acceleration of 2000g or more. In this situation, assume that blood is

  57. Chemistry 12

    Hello fellow comrades, I was assigned the sulphur clock reaction lab and I'm a tad bit confused by it. Anyway, here's the lab procedure: 1. take 5 test tubes, labeled a,b,c,d and e. accurately measure out 10.0 ml of .20M sodium thiosulphate in test tube A

  58. Biology

    A drop of two dyes, A and B were placed on the surface of gelatin in two test tubes. After 24 hours dye A and B had traveled 2.7 and 1.8 cm below the surface of the gel in their respective tubes. Calculate the diffusion rates. Why dye has a larger

  59. Math

    A sports store sells ski wax. Here are the numbers of ski wax tubes sold each day for a week. 5, 7, 6, 5, 17, 5, 4 Outlier: 17 Mean with outlier: 7 Mean without outlier: 5.3 (Should I round this?) Should the outlier be used to report the mean number of ski

  60. Math

    I've been stuck on part e. for a while. I already asked this question, but I'm really not sure. Please check my answer for e. __________________________________________________________ A sports store sells ski wax. Here are the numbers of ski wax tubes

  61. Phyics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a

  62. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a

  63. physics

    In a solar water heater, energy from the Sun is gathered by water that circulates through tubes in a rooftop collector. The solar radiation enters the collector through a transparent cover and warms the water in the tubes; this water is pumped into a

  64. chemistry

    Assume that it is necessary to determine the [FE^3+ in a solution that may be 0.0001 to 0.0005 M range . Outline the spectrophotometric method that would accurately give the required data. Be spectific about the solutions that you would use. I know I have

  65. science

    So I have to do this project on simple machines. The invention we need to make should have at least 2 simple machines on it. We also have to draw it on posterboard and write a paragraph about it. One more thing is that it must make a person's life easier

  66. Science

    how do test tubes relate to science??

  67. Science

    Explain how xykem tubes help support a plant.

  68. Chemistry

    Identify an inert element that is used in electrical discharge tubes.

  69. life science

    Two breaking tubes,two drnking staws,clear lime water

  70. SCIENCE

    science concept map!! test tubes matter oxygen please please please please HELP!!

  71. science

    Metal that allows X-Rays to pass through. Often found in windows of X-Ray Tubes.

  72. health

    what is an inflammation of the mucous membrane if the bronchial tubes caused by smoking

  73. Math(Stat)

    If the tube were guaranteed to last for 600 hours, what percent of the tubes may have to be replaced under the guarantee

  74. Microbiology

    What if you found gas in the Lab tubes but none in the BGLB thow does this affect the EC test

  75. college chemistry

    Please be specific! Briefly explain whether each if the following procedural errors would result in a high, low, or an unchanged calculated mass of Ca2+ in the analyzed tablet. a)a student had difficulty decanting the supernatant solution from the test

  76. anatomy

    large tubes from trachea to lungs is a. anoxia b. diaphragm\ intercostals c.spirometer d. breathing

  77. thesis statement

    I had turned in a thesis statement but it was to long is this good enough? G tubes are very important for they are used to help or save lives.

  78. Life science

    Grade 11 learners want to investigate which enzyme is responsible for chemical digestion of starch into glucose in humans.They are provided with two different enzymes ( carbohydrase and protease),starch powder,warm water at about 37 degrees Celsius and

  79. chemistry

    pH Indicators 7 test tubes Added 5mL of water of 0.1 HCl and 5mL of water to 1st test tube. Poured 9mL of water to remaining 6 test tubes. Poured 1mL of solution from 1st test tube to 2nd. Poured 1mL from 2nd to third. Poured 1mL from 3rd to 4th. " " 4th

  80. Biology, Chemistry

    I know how to carry out an absorption spectrum I just need help on how to to prepare my test tubes and what to put in then. I am very confused and any help would be greatly appreciated. THANKS ! You will be given a sample containing an unknown

  81. Resonance

    What is a real-life appliction of resonance in tubes? I've already written down musical intruments like the organ and flut and trumpet.

  82. Health P.2

    Pulmonary ventilation is also referred to as ________. A. The lungs B. Gasping C. Breathing D. The bronchial tubes I put C. just making sure its right

  83. chemistry

    Assuming the volume of the connecting tubes is negligible, what will be the pressure in the apparatus after all of the stopcocks are opened and the gases are allowed to mix?

  84. Chemistry

    From your Dilution Data in the procedure 3 and 4, calculate the initial concentration of Fe3+ (aq) ion for tubes 2-5. 1. Add 5.00ml of 1.00 x10^-3 M KSCN to all tubes. 2. To test tube 1 add 5 ml of 0.200M Fe(NO3)3. 3. Measure 8.00ml of 0.200M Fe(NO3)3 into

  85. Chemistry

    Neon gas produced for use in luminous tubes comes packaged in 1.0-L containers at a pressure of 1.02 atm and a temperature of 24°C. How many moles of Ne do these cylinders hold?

  86. biology

    You have a stock solution that is 350g/L . You perform a 9-fold serial dilution four times. What concentrations will you have in each of your diluted tubes in g/L? (Separate your answers with a comma.)

  87. Health

    The ________ develops in the pregnant female as a source of nourishment and gas exchange for the developing fetus. A. B. Uterus C. Fallopian tubes D. Placenta D?

  88. science,

    What is the main purpose of these tubes? A. making flowers for reproduction B. creating speech C. carrying nutrients and wastes D. taking in and responding to signals from the environment

  89. health

    Which of the following structures are tubes? A. Frontal, maxillary, sphenoidal, ethmoidal B. Eustachian, pharynx, bronchi C. Cilia, adenoids, mucous, epiglottis D. Apex, base, hilum b

  90. Cardiovascular Respirtory

    Which of the following structures are tubes? A. Cilia, adenoids, mucous, epiglottis B. Apex, base, hilum C. Frontal, maxillary, sphenoidal, ethmoidal D. Eustachian, pharynx, bronchi

  91. SCI LAB

    In my science lab we tested anaerobic vs aerobic respiration. for the anaerobic we covered the test tubes with a plastic film. what is the term for that?

  92. algebra

    I NEED HELP SOLVING THIS PROBLEM ,PLEASE EXPLAIN AND SHOW HOW TO SOLVE the answer ."I HAVE 63 LITERS OF HYDROGEN PEROXIDE, HOW MANY TEST TUBES CAN I FILL IF EACH CONTAINED 7/8 OF A LITER?" PLEASE SHOW ME YOUR WORK. AND THANK YOU IN ADVANCED.

  93. english

    does this make sense? Figure 1. Protein Analysis - Determination of the protein concentration of casein in an unknown sample after the addition of the biuret reagent from the results over test tubes 1 to 5.

  94. CHEMISTRY URGENT HELP

    How to draw line graph for showing changes in test tubes while showing that exhaled air contains more carbon dioxide than inhaled air

  95. math

    Lu Win likes to balance things. She balanced three 20 gram weights with a 10 gram weight and two new tubes of glue. How much did each tube of glue weigh?

  96. Clinical Chemistry

    I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve to interpret concentration of compound in unknown samples. Show the steps needed to perform a two-fold serial dilution through 5

  97. chemistry

    There is an apparatus that consistsw of three glass bulbs connected by small glass tubes with the stopcocks closed. Given that the temp. is 27 degrees C, what is the pressure of a gas in each glass bulb? 1L=1.79g CO2 2L=0.162g H2 3L=4.87g Ar

  98. Kim

    In an experiment to show the relationship between substrate concentration and activity of enzymes, why do we add a 0.5 of a 5 pH buffer solution to the enzyme test groups? the test tubes that we use to stop the reaction at specific times are basic

  99. physics

    Water (η = 1.00E-3 Pa·s) is flowing through a horizontal pipe with a volume flow rate of 0.0153 m3/s. As the drawing below shows, there are two vertical tubes that project from the pipe. Assume that H = 0.0477 m and L = 0.670 m I know how to plug in

  100. English

    Similarly, on the left ear, the eardrum, itself, did not appear infected and we simply talked about watching the number of infections that pop up this winter, as well as our potential need to replace tubes, if the infections become too bothersome or

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