Confidence interval for a mean based on sample size
The half width of a 99% confidence interval for a mean based on sample size of 30 is 10. What is the value of the sample standard deviation? Give your answer to 2 decimal places.
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A confidence interval for a population mean is (20.4, 30.8). What is the value of the sample mean?
The half width of a 95% confidence interval for a population mean based on a sample size of 30 is 5.9. What is the value of the standard error of the sample mean? Give your answer to two decimal places.
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What is minimum sample size required to estimate a mean within 2 with 95% confidence if the sample standard deviation is 20?
The convective heat transfer coefficient on the tube outer surfaces is 400 W/m2•K. Estimate the fluid outlet temperatures.
Two ping-pong balls each have a mass of 2.7 g and carry a net charge of 0.430 µC. One ball is held fixed. At what height should the second ball be placed directly above the fixed ball if it is to remain at rest there?
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