A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is σ = 5.
Round your answers to two decimal places.
a. What is the standard error of the mean, σx?
b. At 95% confidence, what is the margin of error?
Given
Sample size=n=40
Sample mean==25
Population Standard deviation==5
The the standard error of the mean=
The MAriginal error
The critical value at 95% confidencce is 1.96
A simple random sample of 40 items resulted in a sample mean of 25. The population...
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Exercise 08.01 A simple random sample of 40 items resulted in a sample mean of 25. The population standard deviation is 5. a. What is the standard error of the mean (to 2 decimals)? b. At 95% confidence, what is the margin of error (to 2 decimals)?
A simple random sample of 30 items resulted in a sample mean of 50. The population standard deviation is σ = 10. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. Enter your answer using parentheses and a comma, in the form (n1,n2). Do not use commas in your numerical answer (i.e. use 1200 instead of 1,200, etc.) b. Assume that the same sample mean was obtained from a sample of 90...