Statistics: Chapter 2 - Measures Of Location & Spread Flashcards

1
Q

What is the mean (x̄)?

A

(Σx) / n

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2
Q

What is the mean (frequency table)?

A

(Σxf) / Σf

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3
Q

What is the median?

A

(n + 1) / 2

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4
Q

What is the lower quartile?

A

25% of n (if not a whole number, round up).

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5
Q

What is the upper quartile?

A

75% of n (if not a whole number, round up).

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6
Q

What is linear interpolation?

A

LB + (Value / Frequency) X CW

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7
Q

What is the interquartile range?

A

Q3 - Q1

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8
Q

What is
-variance?
-standard deviation?

A
  • (∑x^2 / n) - (x̄^2)
  • √ [(∑x^2 / n) - (x̄^2)]
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9
Q

What is the formulae that data is normally coded in?

A

y = (x - a) / b

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10
Q

What is the mean of the coded data?

A

ȳ = (x̄ - a) / b

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11
Q

What is the equation to calculate the coded mean?

A

(x̄ - a) / b

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12
Q

What is the equation to calculate the coded standard deviation?

A

x̄ / b

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