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2. A simple random sample of 50 items resulted in a sample mean of 25. The population standard deviation is σ = 6. (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? = 3. A simple random sample of 70 items resulted in a sample mean of 60. The population standard deviation is σ = 5. (A) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.) ___ to _ (B) Assume that the same sample mean was obtained from a sample of 140 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.) _ to ___ (C) What is the effect of a larger sample size on the interval estimate? a) A larger sample size does not change the margin of error. b) A larger sample size provides a larger margin of error. c) A larger sample size provides a smaller margin of error.

          2. A simple random sample of 50 items resulted in a sample mean of 25. The population standard deviation is σ = 6. (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?
=

3. A simple random sample of 70 items resulted in a sample mean of 60. The population standard deviation is σ = 5.

(A) Compute the 95% confidence interval for the population mean. (Round your answers to two decimal places.)
_____ to _____
(B) Assume that the same sample mean was obtained from a sample of 140 items. Provide a 95% confidence interval for the population mean. (Round your answers to two decimal places.)
_____ to _____
(C) What is the effect of a larger sample size on the interval estimate?
a) A larger sample size does not change the margin of error.
b) A larger sample size provides a larger margin of error.
c) A larger sample size provides a smaller margin of error.

Added by Jose Ignacio L.

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