Homework 2.1.docx - Homework Section 2-1 Frequency...

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Homework: Section 2-1 Frequency Distributions for Organizing 1. 2.1.5 Identify the lower class limits, upper class limits, class width, class midpoints, and class boundaries for the given frequency distribution. Also identify the number of individuals included in the summary. Age (yr) when Frequency award was won 20 to 21 31 Identify the lower class limits. 20,22,24,26,28,30,32 22 to 23 34 Identify the upper class limits. 20,23,25,27,29,31,33 24 to 25 14 Identify the class width . 2 26 to 27 3 20+21/2=20.5 Identify the class midpoints. 20.5,22.5,24.5,26.5,28.5,30.5,32.5 28 to 29 6 21+22/2=21.5 Identify the class boundaries. 19.5,21.5,23.5,25.5,27.5,29.5,31.5,33.5 30 to 31 2 Identify the number of individuals included in the summary. 92 32 to 33 2 Note, the summary is the addition to the frequency and the with may very ], keep eye on boundaries first and last numbers. 2. 2.1.9 Does the frequency distribution appear to have a normal distribution using a strict interpretation of the relevant criteria? **No, the distribution does not appear to be normal. 3. 2.1.10 Does the frequency distribution appear to have a normal distribution? Explain. **Yes, because the frequencies start low, proceed to one or two high frequencies, then decrease to a low frequency, and the distribution is approximately symmetric 4. 2.1.19 Construct one table that includes relative frequencies based on the frequency distributions shown below, then compare the amounts of tar in nonfiltered and filtered cigarettes. Do the cigarette filters appear to be effective? (Hint: The filters reduce the amount of tar ingested by the smoker.)

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