STA-201 WA 10 - Melissa Stewart STA-201 January 2014...

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Melissa Stewart STA-201 January 2014 Written Assignment 10 This written assignment draws on case study discussion exercises at the end of Chapter 8. When preparing your assignment, please identify each answer clearly by question and its number. Case Study: The “Chip Ahoy! 1,000 Chips Challenge (p.357): Answer a,b,c,e (NOT d). You must calculate results by hand (though you may use any technology of your choice to verify your answers). a. Obtain and interpret a point estimate for the mean number of chocolate chips per bag for all bags of Chips Ahoy! Cookies. ( Note: The sum of the data is 52,986.) n=42. And Sum X i (1 < i <n) = 52,986 Mean X = Sum X i /n = 52,986/42 = 1,261.57 chips per bag b. Construct and interpret a normal probability plot, boxplot, and histogram of the data.
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Unformatted text preview: c. Use the graphs in part (b) to identify outliers, if any. Given the information from the graphs in total, there are no outliers. e. Determine a 95% confidence interval for the mean number of chips per bag for all bags of Chips Ahoy! Cookies, and interpret your result in words. ( Note: = 1261.6; s = 117.6.) = 117.6 ơ Mean = 1261.6 ơ x = /√n = 117.6/√42 = 18.146 ơ Mean -2 ơ x = 1261.6 - 36.292 = 1225.308 Mean +2 ơ x = 1261.6 +36.292 = 1297.892 Confidence interval is 1225.308 – 1297.892 Given this, 95.44% confidence is that the amount of chips in a bag of Chips Ahoy Cookies is between 1225.308 to 1297.892....
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