RM L8: Data analysis -

Question 1

What is the mean?

Lesson 8

Answer 1

• Usually called the average
  1. Add up all scores
  2. Divide by total number of scores
• Test scores, temperature, height, age, weight

Question 2

What is 1 strength of mean?

Lesson 8

Answer 2

1. Uses all the numbers in set

Question 3

What are 2 weaknesses of mean?

Lesson 8

Answer 3

1. Outliers / data outside of data set can skew the results
2. Affected by extreme values (couple of very high scores can skew mean so the average is higher than what most of the scores actually are

Question 4

What is the median?

Lesson 8

Answer 4

• The middlemost score
  1. Rank data from S - L
  2. Cross out from both sides
  3. Find the middle number
  4. If 2 numbers as middle add them and divide by 2
• Top 5 olympic medals, likert type questions

Question 5

What is 1 strength of using median?

Lesson 8

Answer 5

1. Gets rid of outliers or very high / low scores

Question 6

What is 1 weakness of using median?

Answer 6

1. As we are crossing out numbers may not represent full set of numbers

Question 7

What is the mode?

Lesson 8

Answer 7

• Most popular score
• Most popular dress size

Question 8

What is 1 strength of mode?

Lesson 8

Answer 8

1. Less influenced by outliers and represents what is typical for given group

Question 9

What is 1 weakness of mode?

Lesson 8

Answer 9

1. Not very useful where no number occurs more than once

Question 10

What is nominal data?

Lesson 8

Answer 10

• categories of data
• Favourite subject: english, maths, science
• MODE

Question 11

What is ordinal data?

Answer 11

• Numerical data on scale by researcher
• Happiness index
• MEDIAN

Question 12

What is interval / ratio data?

Answer 12

• Numerical data on universal data
• Height , weight
• MEAN