7.1 Descriptive Data Analytics

Question 1

What are Descriptive Analytics ?

Answer 1

• Descriptive analytics is a type of analytics used to
  understand the past
• Descriptive analytics is useful in answering
  questions, such as:
• What has happened?
• What is happening?, if up-to-date data are available

Question 2

What type of questions does descriptive anayltics answer?

Answer 2

• what/which/when/how-type questions
• What course has the best rate of attendance?
• Which team scored the most goals in the current
  season?
• When did income first exceed outgoings?
• How many more students are enrolled for Computer
  Science this year compared to last year?

Question 3

What does descriptive analytics focus on

Answer 3

The what, which, when, how not WHY

Question 4

What is Descriptive Statistics?

Answer 4

• Descriptive statistics summarize and organize data to describe its key characteristics. It includes measures like mean, median, mode, variance, and standard deviation.
• To describe and summarize the data.
• e.g what % of accidents occured on rural roads

Question 5

What does Descriptive Statistics cover ?

Answer 5

Descriptive statistics can be used to discover the
following characteristics of data:

• Frequency: how often did something happen?
  (count/percentage)
• Averages: where does the centre of the distribution of the data
  lie? (mean/median/mode)
• Distribution/variation: how ‘spread out’ are the data?
• Position/rank: where does each data point lie in relation to the
  others?

Question 6

What is Inferential Statistics?

Answer 6

• Inferential statistics use sample data to make generalizations or predictions about a larger population. It includes techniques like hypothesis testing, confidence intervals, and regression analysis.
• To make predictions or draw conclusions about a population based on sample data.
• Why type questions

Question 7

what are some hypotheses that we might like to test in Inferential analytics

Answer 7

1. Dual carriageways are more dangerous to travel on than
   single-lane roads
2. Sunday is the least dangerous day to drive
3. Poor road conditions have more effect on accident rates than
   poor weather conditions