practical skills (paper 5)

Question 1

what is a prediction?

Answer 1

a statement of what may happen based o prior knowledge or guesswork

Question 2

what is a hypothesis?

Answer 2

statement providing an explanation or prediction based on knowledge or testable by experiment

Question 3

what is the independent variable?

Answer 3

the variable that is chosen to be changed

Question 4

what is the dependent variable?

Answer 4

what is observed/measured

Question 5

what is the controlled/standardised variable?

Answer 5

variables that you keep the same

Question 6

how do you make a 1% sugar solution?

Answer 6

solution with 1g of sugar for every 100g of water

Question 7

what is continuous data?

Answer 7

set of data in which any individual reading can have any value between the two extremes

Question 8

what is discrete data?

Answer 8

a set of data in which each measurement can only belong to one of a limited number of values

Question 9

what is ordinal data?

Answer 9

set of data which values aren’t numerical, results arranged in a sequence

Question 10

what is nominal data?

Answer 10

set of data which individual results can’t be arranged in sequence, instead each assigned to a distinct category

Question 11

what is a control experiment?

Answer 11

experiment in which factor whose effect is being investigated is absent, used as a standard of comparison

Question 12

mode

Answer 12

most common value in set of resultz

Question 13

median

Answer 13

middle value of all values

Question 14

normal distribution

Answer 14

set of data which graph shows symmetrical distribution around central value

Question 15

what is standard deviation?

Answer 15

calculated value that indicates how widely set of data spreads out from the mean value