L3 - Descriptive stats 1

Question 1

How can you identify a normal distribution?

Answer 1

symmetrical bell-shaped curve

Question 2

How can you identify a skewed distribution?

Answer 2

asymmetrical curve with a longer tail on one side

Question 3

How can you identify a uniform distribution?

Answer 3

all values have equal probability

Question 4

How can you identify a bimodal distribution?

Answer 4

2 distinct peaks

Question 5

How can you identify a multimodal distribution?

Answer 5

more than 2 peaks

Question 6

What do measures of central tendency do?

Answer 6

help us understand the centre or average of a distribution

Question 7

what are the 4 most common measures of tendency

Answer 7

mean
median
mode
range

Question 8

how to calculate the mean?

Answer 8

the average of all the values
add values and divide by how many there are

Question 9

how to calculate the median?

Answer 9

the middle value when data is arranged in ascending or descending order

Question 10

how to calculate the mode?

Answer 10

the most frequently occurring value

Question 11

what’s a frequency distribution?

Answer 11

a way to organise and display data by showing the number of times each score or value occurs in a dataset

Question 12

what’s a histogram?

Answer 12

type of plot used to represent a frequency distribution
commonly used for all types of data - not nominal

Question 13

what’s a skewed distribution?

Answer 13

distributions with one central peak that aren’t symmetrical

Question 14

what’s a positive skew?

Answer 14

a long “tail” to the right

Question 15

what’s a negative skew?

Answer 15

a long “tai” to the left