Testing company-s claim, From past data, it is recognized

Testing company-s claim

Reference no: EM1316913

Q1) Table illustrates the SAT verbal test scores for 9 randomly selected female students and 14 randomly selected male students. Suppose that sat verbal test scores are normally distributed. At a = 0.01, test claim that test score variance for females is different from that for males.

Female	480	610	340	630	520	690	540
Male	560	680	360	530	380	460	630
Female	600	800
Male	310	730	740	520	560	400	510

Q2) Steel pipe fittings company claims that yield strength of its nontempered couplings is more variable than that of its tempered couplings. Random sample of 9 tempered couplings has standard deviation of 13.1 megapascals, and similar sample of 9 nontempered couplings has standard deviation of 25.4 megapascals. From past data, it is recognized that company's production process results in normally distributed yield strengths. Test company's claim at a = 0.05.

Reference no: EM1316913

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