Flashcards on Descriptive Statistics Exam Practice

Descriptive Statistics Exam Practice: Your Ultimate Guide

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Given the data set 12, 18, 20, 22, 18, 16, 20, 18, 22, 16, 20, 18, what is the range of the data?

Range = maximum − minimum = 22 − 12 = 10.

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Descriptive Statistics

6 cards

Card 1

Question: Given the data set 12, 18, 20, 22, 18, 16, 20, 18, 22, 16, 20, 18, what is the range of the data?

Answer: Range = maximum − minimum = 22 − 12 = 10.

Card 2

Question: Using the same data set, how do you calculate the mean score and what is its value?

Answer: Mean = (sum of all scores) / (number of scores). Sum = 12+18+20+22+18+16+20+18+22+16+20+18 = 220. Number =12. Mean = 220/12 = 18.333... (≈18.33).

Card 3

Question: What is the mode of the data set 12,18,20,22,18,16,20,18,22,16,20,18?

Answer: Mode = the most frequent value. 18 appears 4 times (more than any other), so the mode is 18.

Card 4

Question: How do you find the median of the 12 scores and what is the median for this data set?

Answer: Order the data and take the average of the 6th and 7th values (even n). Ordered: 12,16,16,18,18,18,18,20,20,20,22,22. 6th = 18, 7th = 18. Median = (18

Card 5

Question: Outline the steps to compute the standard deviation for this data set.

Answer: 1) Find the mean (≈18.333). 2) For each score, compute (score − mean)² and sum them. 3) Divide by n (for population) or (n−1) (for sample) as required

Card 6

Question: What frequency table entries would summarize the scores 12,16,16,18,18,18,18,20,20,20,22,22?

Answer: Score : Frequency — 12 : 1; 16 : 2; 18 : 4; 20 : 3; 22 : 2.