According to past research plesterol levels of adult males are approximately normally distributed with a mean of 224 and a

Question

According to past research plesterol levels of adult males are approximately normally distributed with a mean of 224 and a standard deviation of 21 7 Some researchers specializing in health care claim that because healthier foods have become more expensive the standard deviation o Of cholesterol levels of adult males is now less than 21 7 The researchers take a random sample of 21 adult males and measure their cholesterol levels The people in the sample have a mean cholesterol level of 225 5 and a standard deviation of 14 0 Is there enough evidence to conclude at the 0 10 level of significance that the standard deviation of cholesterol levels of adult males is now less than 21 7 a State the null hypothesis H and the alternative hypothesis H H H 0 Perform a one tailed test Then complete the parts below Carry your intermediate computations to three or more decimal places If necessary consult a list of formulas b Determine the type of test statistic to use Choose one c Find the value of the test statistic Round to three or more decimal places 0 mg dL d Find the critical value Round to three or more decimal places 0 e Can we support the claim that the standard deviation of cholesterol levels of adult males is now less than 21 7 3 XI mg dL a X S 2 0 0 OSO 0 0 O O P 010 20 O O

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