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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At what time does the hour hand point in the same direction as the electric field vector at the center of the dial? (hint: use symmetry)
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.
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