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Question 1

Formula for finding the position of the median of a data set?

Answer 1

N+1/2

• If it is a number like 5.5, then you take the average of number in position 5 &6.

Question 2

How can the range of a data set be found?

Answer 2

HIGHEST DATA POINT- LOWEST DATA POINT

Question 3

What is IQR AND THE FORMULA?

Answer 3

GIVES US THE SPREAD OF THE MIDDLE 50% OF THE DATA. FORMULA [(Q3-Q1)=IQR]

Question 4

How do we find q1 and q3 with even numbers?

Answer 4

• We spilt the data set into half
• Find the average of the data sets that you split.

Question 5

How do we find q1 and q3 with odd numbers?

Answer 5

• Find the median of the entire data set
• Cross out the median
• Split the data set
• find the median of the data sets separately.

Question 6

What are the two types of data?

Answer 6

Numerical & Categorical

Question 6

What are the different types of categorical data?

Answer 6

Nominal & Ordinal

Question 7

What are the different types of Numerical data?

Answer 7

Discrete and continuous

Question 8

In what ways can we display Categorical data?

Answer 8

• Frequency Tables
• Bar Charts
• Segmented Bar Charts

Question 9

In what ways can we display Numerical data?

Answer 9

-Histograms
- Stem Plots
- Dot Plots

Question 10

How to describe numerical data?

Answer 10

Comment On The:
-The shape of the distribution
- The spread of the distribution
- The Centre of the distribution.

Question 11

How to comment on the Centre of a graph?

Answer 11

We comment on the mean and median.
- Mean= (Sum of data values)/(number of data values)
- Median = n+1/2 (- If it is a number like 5.5, then you take the average of numbers in positions 5 &6.)

Question 11

How to comment on the shape of a graph?

Answer 11

• Symmetrical: The peak is at the Centre and the distribution is at a bell curve shape.
• Positively skewed: The tail of the graph stretches towards the right ( in the positive direction of the x-axis).
• Negatively skewed: The tail of the graph stretches towards the left ( in the negative direction of the x-axis).

Question 11

How to comment on the Spread of a graph?

Answer 11

We comment on the RANGE and IQR.

Question 12

What do we need to include in a box-plot/ describe the step by

EDITTTT LATERRRR

Answer 12

First we calculate the outliers:
Lower fence=q1-1.5 x IQR
Upper fence =q3+1.5 x IQR

• If minimum value is 4, and the outlier for the lower fence = -1.5, then -1.5 is the outlier.
• If maximum Value is 21 and outlier is 14, then 21 is the outlier and 14
• Lowest Number.
• Q1.
• Q2 Median.
• Q3.
• Highest Number.

Question 13

What does standard deviation tell us?

Answer 13

It tells us how spread out our data is in relation to the mean.

Question 14

Formula for standard deviation?

Answer 14

s=√Σ ( x - x̄)^2/n-1

• Σ ( x - x̄)^2 : Sum of ( x - x̄)^2
• x: is the data point
• x̄: mean of the data set.
• n: is the no of data points we have.

Question 15

What does the (68-95-99.7) rule mean?

Answer 15

68% of the data lies between One standard deviation of the mean.

95% of the data lies between Two standard deviations of the mean.

99.7% of the data lies between Three standard deviations of the mean.

Question 16

What is the structure of a bell curve?

Answer 16

0.15% (-3)
2.35% (-2)
13.5% (-1)
34% (0)
34% (0)
0.15% (3)
2.35% (2)
13.5% (1)

Question 17

Steps to construct a stem and leaf plot?

Answer 17

• ON BOTH SIDES THE LOWEST NUMBER IS ALWAYS CLOSEST TO THE STEM.
• INCLUDE A KEY

Question 18

Parallel Box-Plots

Question 19

What does the term flat depri