ch.5 statistics 1

Question 1

what are the 2 categories of data?

Answer 1

categorical (words e.g. hair colour)

numerical (numbers e.g. number of people)

Question 2

data can be divided into 2 sources…

Answer 2

primary (survey/experiment carried out by urself)

secondary (data obtained from other sources e.g. internet, newspaper)

Question 3

ways to collect data

Answer 3

• survey (questionnaire, telephone survey, observation)
• experiment (usually done in the laboratory)
• research (books, website, newspaper)

Question 4

population and sample

Answer 4

• a population = the entire group that u want to draw conclusions about
• a sample = the specific group u will collect data from (the size of the sample is always less than the total size of the population)

Question 5

bias

Answer 5

• occurs if sample is not carefully selected
• can affect outcome of survey
• too small or too large sample size can affect outcome of survey

Question 6

random sample

Answer 6

• a sample is said to be random if every member of the population has equal chance of being selected or chosen