Determining the sample standard deviation
What is minimum sample size required to estimate a mean within 2 with 95% confidence if the sample standard deviation is 20?
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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.
Nitric acid is a strong acid , ammonium hydroxide is a weak base, and ammonium nitrate is a soluable salt, What is the net ionic equation for the reaction below?
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.
What is the molarity of a hydrocholric acid solution if 20.00 ml of HCL is required to neutrilize .424 of sodium carbonate (105.99 g/mol)
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?
Calculate: The temperature of the steam entering the turbine. The work input by the pump. The heat added in the boiler. The net work of the cycle. The thermal efficiency.
Find the lower end point of a 95% confidence interval for a population proportion based on a sample size of 100 if the sample proportion is 0.4. Give your answer to 2 decimal places.
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