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Devry Math 221 Week 3 Quiz with Formulas - Latest

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DeVry MATH 221 Week 3 quiz with Formulas - Latest
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MATH 221 Week 3 Quiz - 2015
1. Use the Venn diagram to identify the population and the sample.
Choose the correct description of the population.
1. The number of home owners in the state
2. The income of home owners in the state who own a car
3. The income of home owners in the state
4. The number of home owners in the state who own a car
Choose the correct description of the sample
1. The income of home owners in the state who own a car
2. The income of home owners in the state
3. The number of home owners in the state who own a car
4. The number of home owners in the state
Hint: Population is the entire group about which information is needed.
A sample is a smaller group of members of a population selected to represent the population.
2. Determine whether the variable is qualitative or quantitative.
Favorite sport
Is the variable qualitative or quantitative?
1. Qualitative
2. Quantitative
Hint: Since the favorite sport cannot be expressed in numerical terms, it is qualitative.
3. Students in an experimental psychology class did research on depression as a sign of stress. A test was administered to a sample of 30 students. The scores are shown below.
43   50   10   91   76   35   64   36   42   72   53   62   35   74   50
72   36   28   38   61   48   63   35   41   22   36   50   46   85   13
To find the 10% trimmed mean of a data set, order the data, delete the lowest 10% of the entries and highest 10% of the entries, and find the mean of the remaining entries.   Complete parts (a) through (c).
• Find the 10% trimmed mean for the data.
The 10% trimmed mean is 48.8.(Round to the nearest tenth as needed.)
Hint: Please see the excel spreadsheet.
• Compare the four measures of central...

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