# Statistics and working with data

Case study problem attached.

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The following are the number of chips per bag for the 42 bags of Chips Ahoy! analyzed.

1200 1219 1103 1213 1258 1325 1295

1247 1098 1185 1087 1377 1363 1121

1279 1269 1199 1244 1294 1356 1137

1545 1135 1143 1215 1402 1419 1166

1132 1514 1270 1345 1214 1154 1307

1293 1546 1228 1239 1440 1219 1191

a. Obtain and interpret a point estimate for the mean number of chocolate chips per bag for all bags of Chips Ahoy! cookies (The sum of data is 52,986.)

b. Construct and interpret a normal probability plot, boxplot, and histogram of the data.

c. Use the graphs in part b to identify outliers, if any.

d. Is it reasonable to use the one sample t-interval procedure to obtain a confidence interval for the mean number of chocolate chips per bag for all bags of Chips

Ahoy! cookies? Explain your answer.

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.

(-x= 1261.6 ; s = 117.6)

f. Use the program of your choice to solve a. b. and e.

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(See attached file for full problem description)

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#### Solution Summary

This shows how to work with data to find a point estimate for a mean; construct and interpret a probability plot, boxplot, and histogram; identify outliers; and determine a confidence interval.