CH 3, 3-3 Measures of Relative Standing and Boxplots Flashcards Preview

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Flashcards in CH 3, 3-3 Measures of Relative Standing and Boxplots Deck (13)
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1
Q

What is the number of standard deviations that a given value x is above or below the mean?

A

z number

2
Q

What is the formula for finding a z score?

A
3
Q

What are the round off rules for z scores?

A

two decimal places

4
Q

What determines is a z score is significantly low or significantly high?

A

less than or equal to -2 values are signficantly low

greater than or equal to +2 values are significantly high

5
Q

What are measrues of location denoted with P1, P2, …, P99, which divide a set of data into 100 groups with about 1% of the values in each group?

A

Percentiles

6
Q

What is the formula for finding the percentile of a data value?

A

= (number of values less than x / total number of values) * 100

7
Q

What formula converts a percentile to a data value?

A
8
Q

What are 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?

A

Quartiles

9
Q

In which quartile is at least 75% of the stored values less than or equal to said quaritle and 25% fo the values are greater?

A

Q3

10
Q

What five values does the 5-number summary consist of?

A

Minimum

Q1

Q2

Q3

Maximum

11
Q

What is a graph of a data set that consitis of a line extending from the mimimum value to the maximum value and a box with lines drawn at the fist quartile, the median, and the third quartile?

A

boxplot or box-and-whisker diagram

12
Q

How do you calculate the interquartile range? (IQR)

A

IQR = Q3 - Q1

13
Q

What are the steps in identifying an Outlier for Modifiied Boxplots?

A

Find Q1 Q2 Q3

Find the IQR

Evaluate 1.5 * IQR

Value is an outlier if it is above Q3 by an amount greater than 1.5 * IQR

Or bellow Q1 by an amount greater than 1.5 * IQR