Stats Chapter 4 (representation)

Question 1

Stem and leaf why?

Answer 1

Present data of two or more significant figures
Can give the exact detail
Quartile steadily findable
Two sets can be compared using back to back

Question 2

How does stem and leaf look?

Answer 2

Needs a key also!
(Eg 1|8 means 18 books)
First digit | second digits…… [total]

Question 3

What is an outlier

Answer 3

An extreme value that lies outside the overall pattern of data

Question 4

Outlier equation

Answer 4

Q3 + (IQR x 1.5)

Or

Q1 - (IQR x 1.5)

Question 5

Shape of a data set is often called the

Answer 5

Skewness

Question 6

Symmetrical skew

Answer 6

Q2-Q1 = Q3-Q2

Mode= median = mean

Question 7

Positive skew

Answer 7

Q2-Q1

Question 8

Negative skew

Answer 8

Q2-Q1>Q3-Q2

(Space on right is smaller than on left)

Mode>median>mean

Question 9

Skew equation

Answer 9

3(mean-mediun)/standard deviation