Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Math > Stats > Flashcards

Stats Flashcards

1
Q

What are the 3 types of average?

A

Mean, median mode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

How to find the mean?

A

Add all the numbers together and multiply by how many numbers there are

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the median and how do you find it?

A

It is the middle number.
Write all the numbers in order and then pick the middle number. If there are two in the middle, you find the mean or those two.

Basically just half way in between them.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a summary question?

A

Focus on the whole group

Eg: I wonder what the most popular TV show is

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a comparison question?

A

Compared 2 groups.

Eg: I wonder if year 9 students tend to be more active than year 10 students

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are relationship questions?

A

Compare two measurement variables

Eg: I wonder if armspan is the same as height.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What kind of question is this:

“I wonder how many people walked to school”

A

Summary

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What kind of question is this:

“I wonder if most boys are taller than most girls”

A

Comparison

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What kind of question is this:

“I wonder why younger students run more at lunchtime”

A

Can’t be answered from the data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What kind of question is this:

“I wonder if most students armspan is the same as their height”

A

Relationship

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

How is relationship data graphed?

A

On a scatter plot with a trend line through it. A scatter plot has measurement variables on both the x and y axis of the plot and they relate to each other as you graph them.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

A relationship can be described as positive if?

A

The trend line goes up /

Negative if it goes down \

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

The range and quartiles give us information about the?

A

Spread of the data

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Range?

A

Spread of the whole data set. Difference between the minimum and maximum values.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Lower quartile?

A

The median of the lower half of the data. 1/4 of the data is below it.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Upper quartile?

A

Median of the upper half of the data. 1/4 of data is above it.

17
Q

Inter quartile range?

A

The difference between the UQ and the LQ.

IQR = UQ-LQ

18
Q

To find quartiles you?

A

Find the median, and then find the median of the bottom half below the median, and the median of the top half above the median

19
Q

3 steps for a stats conclusion?

A
  1. Answer the question
    Eg: in conclusion, from this data I can see that
  2. Justify your answer
    Eg: I know this because
  3. Relate to context
    Eg: this makes sense to me because
20
Q

To be able to make the call as to whether on groups data is different to the other group we need to compare the?

A

Box and whisker graphs

21
Q

To make a box and whisker graph you?

A

Draw a line at the lowest date point, a line at the LQ, a line at the median, a line at the UQ and a line at the highest date point. Then draw a box from the LQ to the UQ with the median in it. Then connect whiskers to the highest and lowest data points.

22
Q

How can you tell from a box and whisker graph that one groups data is different to the other groups you must?

A

Be able to see that the median of one groups data is OUTSIDE AND ABOVE the IQR box of the other set of data.

23
Q

What kind of shape is a graph with one peak?

A

Unimodal

24
Q

What kind of shape is a graph with two peaks?

A

Bi-modal

25
Q

What kind of shape is a graph with a bell shaped curve?

A

Normal curve

26
Q

What kind of shape is a graph where all the data comes to roughly the same height?

A

Uniform

27
Q

What kind of shape is a graph where most of the data is to the right of the highest point?

A

Right skew

28
Q

What kind of shape is a graph where most of the data is to the left of the highest peak?

A

Left skew

29
Q

What kind of shape is a graph where there is a scattering of data to the right?

A

Long tail to the right

30
Q

What kind of shape is a graph where there is a scattering of data to the left?

A

Long tail to the left

31
Q

What are the 2 types of data?

A

Qualitative (categorical) and quantitative (numerical).

32
Q

What kind of data is qualitative/categorical data?

A

Data that is:

  • not numbers
  • always discrete

Eg: favourite colours of a group

33
Q

What are the two types of quantitative/numerical data and what is the difference between them?

A

Discrete:
- can be counted
Eg how many pets do you have

Continuous:
- is measured
Eg height, weight etc.

34
Q

What is mode?

A

The most common number

Math (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions