A new type of fabric is claimed to be wrinkle-free. There are other wrinkle-free fabrics in the market, but how can these be compared? Comparison is done by measuring the wrinkle recovery angle (WRA) of the fabric, in degrees. Higher is better. The current top brand in the market claims that their fabrics have a WRA of 141 degrees on the average. A sample of fabrics from the new type were subjected to tests in order to measure their WRA and the following observations were obtained: 137, 144, 146, 141, 137, 138, 144, 135, 141, 139, 140, 146, 142, 139, 140

Test the hypothesis that the population mean of the WRAs of the new type of fabric exceeds that of the current top brand. Use α = 0.01

pur-new-sol

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