A manufacturer of piston rings for automobile engines frequently tests the width of the rings for quality control. Last week, a random sample of 15 rings were measured, and the mean and standard deviation of the sample were used to construct a 95 percent confidence interval for the population mean width of the rings. When all other things remain the same, which of the following conditions would have resulted in a wider interval than the one constructed? I. A sample size of 20 with 95 percent confidence II A sample size of 15 with 99 percent confidence III. A sample size of 12 with 95 percent confidence (A) I only (B) II only (C) III only (D) I and II (E) II and III

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