Statistical Applications Quiz 2


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Week Two Quiz

1. In a Gallup poll of 1,038 adults, 540 said that second-hand smoke is very harmful. What is the percentage of adults who said second-hand smoke is very harmful? Show the problem:

Answer: 540/1,038=52%

2. The first class in a relative frequency table is 50–59 and the corresponding relative frequency is 0.2. What does the 0.2 value indicate?

Answer: Looking at all of the numbers, the proportion of values of the numbers between50 and 59 is 0.2. That means, 20% of the values are between the numbers of 50 and 59.

3. When you add the values 3, 5, 8, 12, and 20 and then divide by the number of values, the result is 9.6. Which term best describes this value: average, mean, median, mode, or standard deviation?

Answer: The term that best describes this value is the mean.

4. Answer the next four questions using the following set of numbers: 2.0, 3.7, 4.9, 5.0, 5.7, 6.7, 8.5, 9.0

What is the range of the above values? 9.0 – 2.0 = 7.0

What is the median of the above values? 5.0 + 5.7 / 2 = 5.35

What is the mean of the above values? _2.0 + 3.7 + 4.9 + 5.0 + 5.7 +6.7 + 8.5 + 9.0 = 45.5 / 8 = 5.6875 or 5.7

What is the mode of the above values?

These data have no mode because no value occurs more than once. I attempted to find an association of grouping, but the only repeating group is 5.0 and 5.7 which is an even number of grouping leaving no answer.

End of Statistical Applications Quiz 2

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