A school administrator claims that the standard deviation for grade 12 students on a mathematics assessment test

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A school administrator claims that the standard deviation for grade 12 students on a mathematics assessment test is less than 35 points. A random sample of 28 grade 12 test scores has a standard deviation of 34 points. At α = 0.10, is there enough evidence to support the claim?


(a) Identify the claim and state H0 and Ha

(b) Find the critical value(s) and identify the rejection region(s), 

(c) Find the standardized test statistic x2

(d) Decide whether to reject or fail to reject the null hypothesis, and 

(e) Interpret the decision in the context of the original claim. Assume the population is normally distributed.

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