a random sample of 10 shipments of stick-on labels showed the following order sizes. 17,357 11,406 23,605 59,733 16,193 54,556 30,424 13,338 29,384 15,863. (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.) (b) The confidence interval can be made narrower by: a)increasing the sample size or decreasing the confidence level. b)decreasing the sample size or decreasing the confidence level. c)increasing the sample size or increasing the confidence level. d)decreasing the sample size or increasing the confidence level.