important that the variance of the percentage impurity levels in consignments of a chemical not exceed 4, in order to meet established standards. A random sample of 20 consignments had a sample variance of 5.62 in impurity level percentage. Test the null hypothesis that the population variance is no more than 4. (Use 5% significance level) a) 26.69: reject the null b) 26.69: accept the null c) 27.20: reject the null     d) 27.20: accept the null

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It is important that the variance of the percentage impurity levels in consignments of a chemical not exceed 4, in order to meet established standards. A random sample of 20 consignments had a sample variance of 5.62 in impurity level percentage. Test the null hypothesis that the population variance is no more than 4. (Use 5% significance level)

a) 26.69: reject the null b) 26.69: accept the null c) 27.20: reject the null     d) 27.20: accept the null

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