A random sample of 10 shipments of stick-on labels showed the following order sizes.  36,575 30,153 34,820 10,554 15,801 14,198 38,830 56,309 19,461 20,729      Click here for the Excel Data File (a) Construct a 95 percent confidence interval for the true mean order size. (Round your standard deviation answer to 1 decimal place and t-value to 3 decimal places. Round your answers to the nearest whole number.)  The 95 percent confidence interval ________ to _________   (b) The confidence interval can be made narrower by:   decreasing the sample size or decreasing the confidence level. increasing the sample size or increasing the confidence level. increasing the sample size or decreasing the confidence level. decreasing the sample size or increasing the confidence level.

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