GRADED A ACTUAL TEST Questions and Answers

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GRADED A+ (ACTUAL TEST ) Questions and Answers (Solved)

• interquartile range (IQR)

Answer: Q3 Q1

• outlier n a modified boxplot

Answer: above Q3, by an amount greater than 1.5 × IQR or below

Q1, by an amount greater than 1.5 × IQR.

• modified boxplot

Answer: regular boxplot constructed with these modifications:

1.) A special symbol (such as an asterisk or point) is used to identify outliers as defined above

2.) the solid horizontal line extends only as far as the minimum data value that is not an outlier and the maximum data value that is not an outlier.

• skewed data

Answer: data that is not symmetric and extends more to one side

than to the other

• boxplot (or box-and-whisker diagram

Answer: a graph of a data set that consists of a line extending from

the minimum value to the maximum value, and a box with lines drawn at the first quartile Q1, the median, and the third quartile

Q3. 1 / 3

• 5-number summary

Answer: consists of these five values: 1.) Minimum 2.) First quartile, Q1 3.) Second quartile, Q2 (same as the median) 4.) Third quartile, Q3 5.) Maximum

• Interquartile Range (IQR)

Answer: Q3 - Q1

• Semi-interquartile range

Answer: Q3 - Q1 ÷ 2

• Midquartile range

Answer: Q3 + Q1 ÷ 2

• 10 - 90 quartile range

Answer: P90 - P10

11. Q3 (Third quartile):

Answer: Same as P75. It separates the bottom 75% of the sorted

values from the top 25%.

12. Q2 (Second quartile):

Answer: Same as P50 and same as the median. It separates the

bottom 50% of the sorted values from the top 50%.

13. Q1 (First quartile):

Answer: Same value as P25. It separates the bottom 25% of the

sorted values from the top 75%. 2 / 3

• Quartiles

Answer: measures of location, denoted Q1, Q2, and Q3, which

divide a set of data into four groups with about 25% of the values in each group

• Converting a Percentile to a Data Value

Answer: Converting a Percentile to a Data Value

• n variable

Answer: total number of values in the data set

• k variable

Answer: percentile being used (Example: For the 25th percentile, k

= 25.)

• L variable

Answer: locator that gives the position of a value (Example: For the 12th value in the sorted list, L = 12.)

• Pk variable

Answer: kth percentile (Example: P25 is the 25th percentile.)

• Finding the Percentile of a Data Value

Answer: Percent value of x = number of values less than x ÷ total

number of values × 100

The process of finding the percentile that corresponds to a particular data value x is given by the following (round the result to the nearest whole number)

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