1: Exploring Data Flashcards Preview

MEI S1 Maths > 1: Exploring Data > Flashcards

Flashcards in 1: Exploring Data Deck (14)
Loading flashcards...
1
Q

How do you calculate the mid-range?

A

(Highest + Lowest) / 2

2
Q

What measures of central tendency are affected by outliers?

A

Mean

Midrange as it assumes the data is symmetrical

3
Q

How do you work out the mean from a frequency table?

A

(Total (Frequency * X)) / Total Frequency

4
Q

What values do you use when calculating the mid-range from a frequency table?

A

Highest and lowest X values

5
Q

How do you work out the mean from a grouped frequency table?

A

(Total (Frequency * Midpoint of X)) / Total Frequency

6
Q

How do you find the median from a cumulative frequency diagram?

A

Draw a line across from the middle frequency value and find where it crosses the line

7
Q

How do you calculate Sxx?

A

Total x^2 - ((Total x)^2) / n)

8
Q

What is the formula for mean squared deviation?

A

Sxx / n

9
Q

What is the formula for root mean squared deviation?

A

SqRt (Sxx / n)

10
Q

What is the formula for variance?

A

Sxx / n-1

11
Q

What is the formula for standard deviation?

A

SqRt (Sxx/n-1)

12
Q

What would you change about the formula for msd/rmsd/var/sd if you’re working from a frequency table?

A

Use ‘total frequency’ instead of ‘n’

13
Q

How do you test for outliers?

A

2 Standard Deviations from the mean OR 1.5 IQR below the first quartile or above the third quartile

14
Q

Does multiplication or addition affect the standard deviation?

A

Multiplication