Bar Charts, Histograms, Correlational Analysis, Scatter Graphs And Distributions

Question 1

What is a bar chart and how is it different from a histogram?

Answer 1

• Data can be divided into categories - discrete data, e.g. Comparing people who drink water and Red Bull.
• Bars touch each other -> data is continuous rather than discrete.

Question 2

What is a correlation co-efficient?

Answer 2

• Number between 0 and 1.
• Tells us how strong the correlation is -> the nearer to 1, the stronger the relationship.
• It has a plus or minus sign in front of the number which tells us whether the correlation is positive or negative.
  
  • E.g. -0.85 would be a negative correlation.

Question 3

What is a positive correlation?

Answer 3

• Both variables increase (or decrease) together.
• E.g. more revision done means higher results -> revising = success.

Question 4

What is a negative correlation?

Answer 4

• As 1 variable increases the other decreases.
• E.g. the more jab given the number of affected patients falls.

Question 5

What is a no correlation?

Answer 5

• no relationship between the variables.

Question 6

What are the different types of distributions?

Answer 6

• Normal distribution
• Skewed distribution
• Negative distribution
• Positive distribution

Question 7

What is normal distribution?

Answer 7

• A symmetrical spread of frequency data that forms a bell-shaped pattern. The mean, median and mode are all located at the highest peak.

Question 8

What is skewed distribution?

Answer 8

• A spread of frequency data that is not symmetrical, where the data clusters to one end.

Question 9

What is negative distribution?

Answer 9

• Type of distribution in which the long tail is on the negative (left) side of the peak and most of the distribution is concentrated on the right.

Question 10

What is positive distribution? (right)

Answer 10

• A type of distribution in which the long tail is on the positive (right) side of the peak and most of the distribution is concentrated on the left.