Kale is a type of cabbage commonly found in salad and used in cooking in many parts of the world. Six measurements were made of the mineral content (in percent) of kale, with the following results.

It turns out that the value 26.1 came from a specimen that the investigator forgot to wash before measuring.

a. The data contain an outlier that is clearly a mistake.
Eliminate the outlier, then construct a 95% confidence interval for the mean mineral content from the remaining values.

b. Leave the outlier in and construct the 95% confidence interval. Are the results noticeably different? Explain why it is important to check data for outliers.

Transcribed Image Text:

26.1 17.5 15.4 16.4 15.1 12.8