1. You may need to use the appropriate appendix table or technology to answer this question.A simple random sample of 60 items resulted in a sample mean of 25. The population standard deviation is

= 9.

(Round your answers to two decimal places.)

(a)What is the standard error of the mean,

-_x?

(b)At 95% confidence, what is the margin of error?

2. You may need to use the appropriate appendix table or technology to answer this question.A simple random sample of 60 items from a population with = 6 resulted in a sample mean of 32. (Round your answers to two decimal places.)

(a)Provide a 90% confidence interval for the population mean.

_______ to ________

(b)Provide a 95% confidence interval for the population mean.

_______ to _________

(c)Provide a 99% confidence interval for the population mean.

________to _______

3. You may need to use the appropriate appendix table or technology to answer this question.A simple random sample of 60 items from a population with

= 6 resulted in a sample mean of 32. (Round your answers to two decimal places.)(

(a)Provide a 90% confidence interval for the population mean.

________ to _______

(b)Provide a 95% confidence interval for the population mean.

______ to _______

(c)Provide 99% confidence interval for the population mean.

_____ to ______