The UMUC Daily News reported that the color distribution for plain M&M's was: 40% brown, 20% yellow, 20% orange, 10% green, and 10% tan. Each piece of candy in a random sample of 100 plain M&M's was classified according to color, and the results are listed below. Use a 0.05 significance level to test the claim that the published color distribution is correct. Show all work and justify your answer.

 

Color       Brown        Yellow         Orange         Green      Tan 

 

Number   38                     22            13                    9           18

(a) What is the appropriate hypothesis test: z-test for sample proportion, t-test for sample mean, chisquare goodness of fit test, F-test for ANOVA? Please identify and explain why it is appropriate for analyzing this data.

(b) Identify the null hypothesis and the alternative hypothesis.

(c) Determine the test statistic. Round your answer to two decimal places. Show all work; writing the correct test statistic.

(d) Determine the P-value. Round your answer to two decimal places. Show all work; writing the correct P-value.

(e) Compare p-value and significance level . What decision should be made regarding the null hypothesis (e.g., reject or fail to reject) and why?

(f) Is there sufficient evidence to support the claim that the published color distribution is correct? Justify your answer.