General Descriptives

Question 1

What is nominal data

Answer 1

Labels, no order or notion of spacing. (Eg. What country are you from?)

Question 2

What is ordinal data

Answer 2

Ordered list small to big (Eg. On a scale from 0-10)

Question 3

What is numerical data

Answer 3

Clearly defined intervals. Values on number line. (Eg. What is your age?)

Question 4

4 types of numerical data

Answer 4

Interval
Ratio
Discrete
Continuous

Question 5

What is a skewed distribution

Answer 5

Mean is closest toward the tail

Median stays closer to the bulk of values

Mode is the peak (furthest from the tail)

Positive skew - mean is higher value than median

Negative skew - mean is lower value than median

Question 6

What are the factors that contribute to normal distribution

Answer 6

Many factors contribute. Someone will have more of one factor and less of another. Random combinations of factors. Often a high factor and a low factor will cancel giving a more average outcome. More rare to have a lot of high factors coming together. Likewise rare to have a lot of low factors. Hence much bunching around the middle and fewer values at the extremes.

Question 7

How do you find the mean of data

Answer 7

Arrange data points in ascending order

If the no. of data points is odd the median is the middle value.
If the no. of data points is even the median is the average of the 2 middle values

Question 8

How do you find the 1st Quartile

Answer 8

Find the median of the lower half of the dataset (excluding the median of the number of data points is odd)
(Eg. If the dataset has 50 data points, the 1st Quartile is the 13th value)

Question 9

How do you find the 3rd Quartile

Answer 9

Find the median of the upper half of the dataset (excluding the median of the number of data points is odd)
(Eg. If the dataset has 50 data points, the 3rd Quartile is the 38th value)