Ch 8 Sec 4

Ch 8 Sec 4 - Chapter8Section4 ZTestforaProportion...

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Chapter 8 Section 4 Z  Test for a Proportion Mr. Kenneth Horwitz
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z  Test for a Proportion Since a normal distribution can be used to approximate the  binomial distribution when  np   5  and  nq    5, the standard  normal distribution can be used to test hypotheses for  proportions.      The formula for the  test for a proportion is where ˆ - = p p z pq n ( 29 ˆ sample proportion population proportion sample size = = = X p n p n
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Avoiding Trans Fats A dietitian claims that 60% of people are trying to avoid trans  fats in their diets. She randomly selected 200 people and found  that 128 people stated that they were trying to avoid trans fats in  their diets. At  α  = 0.05, is there enough evidence to reject the  dietitian’s claim? Step 1: State the hypotheses and identify the claim.   H
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Ch 8 Sec 4 - Chapter8Section4 ZTestforaProportion...

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