T-Mobile LTE 3:10 PM 31%) Done Test-#1 (Ch. 1-6 with 40 Questions).docx 1. You a
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T-Mobile LTE 3:10 PM 31%) Done Test-#1 (Ch. 1-6 with 40 Questions).docx 1. You are asked whether N, N, D, N, D constitute quantitative or qualitative data. Your best reply is a. quantitative because the letters probably refer to a count. b. qualitative because the letters probably refer to a class ora category. c. quantitative or qualitative depending on whether the letters represent an amount or count, or merely a code. d. quantitative or qualitative depending on the accuracy of the 2. What's wrong with the following frequency distribution? X Erequency 220239 200219 160199 140159 120139 100119 70 99 60 69 30 59 20 29 019 0 0 17 14 82 a. gaps between classes b. unequal classes c. not exactly ten classes d. nothing is wrong 3. Frequency polygons are particularly useful when a. data are qualitative b. data are ungrouped. c. two or more frequency distributions are to be displayed on the same graph. d. the original frequency distribution is to be portrayed with complete accuracy 4. A stem and leaf display is ideal for summarizing distributions when vou want toExplanation / Answer
1)
Correct answer is option c.
Quantitative or qualitative depending on whether the letters represent an amount or count, or merely a code.
Because, the problem does not say, thus "probably" (answer a and b) is pretty weak.And d is wrong because the accuracy of the observations does not determine quantitative or qualitative.The code represented by the letters may be short for a lengthy number, and thus quantitative. An example of qualitative data could be "N" for "Now" and "D" for "Delayed."
2)
Correct answer is option b.
Unequal classes.
Length of Class interval is not same.If we take length of class interval as 10 then the number of class interval will be 55/10 = 5.5 or 6 which is less than the desired number of classes.
3)
Correct answer is option c.
Two or more frequency distributions are to be displayed on the same graph.
Using the definition of Frequency polygons are a graphical device for understanding the shapes of distributions. They serve the same purpose as histograms, but are especially helpful in comparing multiple sets of data. One way to form a frequency polygon is to connect the midpoints at the top of the bars of a histogram with line segments (see Figure below), in addition, one should include one class interval below the lowest value in the data and one above the highest value.
4)
Correct answer is option d.
Preserve the identities of the individual scores.
Stem and leaf displays are ideal for summarizing distributions, such as that for weight data, without destroying the identities of individual observations.
5)
Correct answer is option d.
Shape.
Understand important characteristics of graph shapes. The shape of a graph reflects the "shape" of the underlying distribution--that is, the data on which the graph is based.
6)
Correct answer is option b .
Normal.
If we separately plot the distribution of IQ score of male and female then it is possible to get two modes. But definitely we get normal curve in both cases. i.e. for separate plot & for combine plot.
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