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Maths > Unit 3 - Statistics > Flashcards

Unit 3 - Statistics Flashcards

1
Q

How do you find the degree for the values in a pie chart?

A

Each value divided by total x 360

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2
Q

What type of data do you need to draw a line graph?

A

Continuous

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3
Q

What type of data do you need to draw a bar chart?

A

Categoric

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4
Q

Where does the independent variable go?

A

On the Y-axis

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5
Q

Where does the dependent variable go?

A

On the X-axis

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6
Q

What type of data do you need to draw a back to back stem and lead diagram?

A

NUMBERS ONLY

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7
Q

What do you need to draw on a stem and leaf diagram first?

A

A KEY

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8
Q

What is a frequency polygon?

A

A bar chart that shows the midpoint of each bar.

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9
Q

What is midpoint?

A

The middle value of each group.

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10
Q

What does a time series show?

A

The journey of something

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11
Q

Where is time on a time series graph?

A

On the X-AXIS

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12
Q

What is a period?

A

The time from one peak to another on a time series.

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13
Q

What can you work out on a time series?

A

THE MOVING AVERAGE.

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14
Q

How do you find a two-point moving mean?

A

Mean of first two values.
Mean of values 2 and 3
Mean of values 3 and 4

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15
Q

What does a scatter graph show?

A

The CORRELATION between two things.

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16
Q

What is strong correlation?

A

What the crossed are close together.

17
Q

What is weak correlation?

A

When the crosses are further apart.

18
Q

What is positive correlation?

A

Crosses lean to the right.

19
Q

What is negative correlation?

A

When the crosses lean to the left.

20
Q

What is no correlation?

A

No direction of the crosses.

21
Q

What is the one of best fit?

A

A roughly one showing the general direction of the points.

22
Q

What are outliners?

A

Points that do not fit the general trend of the data.

23
Q

What is the range?

A

The difference between the highest and the lowest values.

24
Q

What is hem mode in a list of data?

A

The value that appears the most.

25
Q

What is the median?

A

The middle value of a set of data.

26
Q

what is the mean in single data?

A

Add all together, divide by how many there are.

27
Q

What is the mode in grouped data?

A

Group with the highest frequency.

28
Q

How do you find the median in frequency data?

A

Add together the frequencies and divide by two.

29
Q

What is the modal group?

A

The group with the highest frequency.

30
Q

What is the median in grouped data?

A

The group with the middle person in.

31
Q

How do you find the mean in grouped data?

A 
Add two more columns. 
Find the midpoint. 
Multiply across.
Add down. 
Divide by total frequency.
32
Q

How do you find the range in grouped data?

A

Highest value in highest group - lowest value in lowest group.

Maths (11 decks)

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