Question

Market researchers recently studied the age of the person in a household who is primarily responsible for purchasing toothpaste. A sample of 21 respondents' ages that purchase Crest brand is provided here and in the file: Week 2 Data.xlsx on the sheet: Toothpaste Age; Variable: Crest Ages Ages for Purchasers of Crest Brand 34 28 35 48 32 41 29 23 28 34 59 38 44 34 49 52 33 50 46 52 45 Calculate the middle 50% of the ages...i.e. the interquartile range (IQR) (you may use technology to generate the IQR). Which of the following represents the middle 50% for the Crest Brand ages? 12.99 years 9.87 years 16 years 24.5 years

Answer 1

To find the middle 50% of the ages for the Crest brand, calculate the first quartile (Q1), the third quartile (Q3), and subtract Q1 from Q3 to find the interquartile range (IQR).

Step-by-step explanation:

To calculate the middle 50% of the ages for the Crest brand, we need to find the first quartile (Q1) and the third quartile (Q3). Q1 is the median of the lower half of the data and Q3 is the median of the upper half of the data. To find the interquartile range (IQR), subtract Q1 from Q3. With the provided data, the middle 50% of the ages for the Crest brand is 24.5 years.

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