Stats

posted by .

The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to
estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of
2.56 mm with a standard deviation of 0.05 mm. You may assume that the diameters of the pipes are normally
distributed.
(A) Give a 95% confidence interval for the average diameter of pipes in this shipment.

  • Stats -

    95% = mean ± 1.695 SEm

    SEm = SD/√n

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    The 3.0 cm-diameter water line splits into two 1.0cm-diameter pipes. All pipes are circular and at the same elevation. At point A, the water speed is 2.0m/s and the gauge pressure is 50kPa. What is the gauge pressure at point B?
  2. Physics

    The water flowing through a 1.9 cm (inside diameter) pipe flows out through three 1.3 cm pipes. (a) If the flow rates in the three smaller pipes are 24, 18, and 13 L/min, what is the flow rate in the 1.9 cm pipe?
  3. stats

    The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of 2.56 mm with a standard …
  4. Fluid Mechanics

    Water flows into a cylindrical tank through pipe 1 at a rate of 25 ft/s and leaves through pipe 2 at 10 ft/s and through pipe 3 at 12 ft/s. Pipe 4 is an open air vent. Internal diameters of the pipes are: D1=3 in, D2= 2 in, D3=2.5 …
  5. algebra

    A pipe manufacturer makes pipes of four different sizes. The diameter of each pipe is two times the diameter of the pipe of the next smaller size. The diameter of the biggest pipe is 16 centimeters. What is the diameter of the pipe …
  6. algebra

    A pipe manufacturer makes pipes of four different sizes. The diameter of each pipe is two times the diameter of the pipe of the next smaller size. The diameter of the biggest pipe is 16 centimeters. What is the diameter of the pipe …
  7. Advanced Maths

    A reservoir is fed by two pipes of different diameter. The pipe with the larger diameter takes three hours less than the smaller pipe to fill the reservoir. if both pipes are opened simultaneously, the reservoir can fill in two hours. …
  8. Maths

    3 inlet pipes A,B and C can be used to fill 1000m^3 water storage tank . When 3 pipes are in operation,the tank can be filled in 10hours .When only pipes A and B are used,the time increases to 20 hours. With pipe A and C, the tank …
  9. science

    A pipe of diameter 80mm is fitted with a branch section into which fit two pipes of equal diameter. If it is desired that the velocity remain constant throughout, determine the required diameter of each of the branch pipes.
  10. math

    water flows into a reservoir at 2000l/min. the depth of the reservoir is to be kept constant by installing some discharge pipes 1m below the surface of water in the reservoir and diameter of the pipes are 25mm. calculate the number …

More Similar Questions