2 - Measures of locations and spread Flashcards

1
Q

How is the lower quartile of discrete data found?

A

n/4
if position is a whole number, then take value between this and the next position
if not a whole number, round up and take this position

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2
Q

What does using grouped frequency tables rely on?

A

Interpolation

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3
Q

What is interpolation?

A

Assuming data values are evenly distributed within each class

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4
Q

How is the upper quartile found for grouped continuous data?

A

n/4th data value

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5
Q

How are variance and standard deviation estimated when using a grouped frequency table?

A

using midpoint if each class interval

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6
Q

How is the mean of coded data found?

A

mean(y) = (mean(x) - a)/b

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7
Q

How is the standard deviation of coded data found?

A

sd(y) = sd(x) x a

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8
Q

In a histogram, what does area represent?

A

Frequency

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