half-term 2- investigations

Question 1

accurate

Answer 1

close to the true value of what you are measuring

Question 2

analyse

Answer 2

the process of looking at data and writing about what you have found out

Question 3

bar chart

Answer 3

a way of presenting data when one variable is discrete or categoric and the other is continuous

Question 4

categoric

Answer 4

a variable that has values that are words

Question 5

conclusion

Answer 5

what you write down to say what you have found out during an investigation

Question 6

confidence

Answer 6

how sure you are of your conclusion based on the data

Question 7

continuous

Answer 7

a variable that has values that can be any number

Question 8

control variable

Answer 8

a variable that you have to keep the same in an investigation

Question 9

data

Answer 9

words or numbers that you obtain when you make observations or measurements

Question 10

dependent variable

Answer 10

a variable that changes when you change the independent variable

Question 11

discrete

Answer 11

a variable that can only have whole-number values

Question 12

evaluate

Answer 12

to discuss the quality of data collected during an investigation and suggest improvements to the method

Question 13

independent variable

Answer 13

a variable you change that changes the dependent variable

Question 14

investigation

Answer 14

an experiment or set of experiments designed to produce data to answer a scientific question or test a theory

Question 15

line graph

Answer 15

a way of presenting results when there are two numerical variables

Question 16

line of best fit

Answer 16

a smooth line on a graph that travels through or very close to as many of the points plotted as possible

Question 17

mean

Answer 17

an average of a set of data, found by adding together all the values in the set and dividing by the number of values in the set

Question 18

observation

Answer 18

carefully looking at an object or process

Question 19

outlier

Answer 19

a result that is very different from the other measurements in a data set

Question 20

pie chart

Answer 20

a way of presenting data when one variable is discrete or categoric and the other is continuous

Question 21

plan

Answer 21

a description of how you will use equipment to collect valid data to answer a scientific question

Question 22

precise

Answer 22

this describes a set of repeat measurements that are close together

Question 23

prediction

Answer 23

a statement that says what you think will happen

Question 24

random error

Answer 24

an error that causes there to be a random difference between a measurement and the true value each time you measure it

Question 25

range

Answer 25

the difference between the lowest and highest values a variable can have

Question 26

repeatable

Answer 26

when you repeat measurements in an investigation and get similar results they are repeatable

Question 27

reproducible

Answer 27

when other people carry out an investigation and get similar results to the original investigation the results are reproducible

Question 28

risk assessment

Answer 28

a description of how you will make it less likely that people will be injured, or equipment damaged, and what to do if this happens

Question 29

spread

Answer 29

the difference between the highest and lowest measurements of a set of repeat measurements

Question 30

systematic error

Answer 30

an error that causes there to be the same difference between a measurement and the true value each time you measure it

Question 31

uncertainty

Answer 31

the doubt in the result because of the way that a measurement is made

Question 32

variable

Answer 32

a quantity that can change, for example, time, temperature, length, mass

Question 33

columns for a good table

Answer 33

• 1 column for independent variable

- 4 columns for dependent variable

Question 34

sides of graph when plotting

Answer 34

up- dependent

across- independent

Question 35

what should a plan include

Answer 35

• what equipment you are going to use and why

- what method you are going to use and why

Question 36

in an investigation what do you need to decide about measurements?

Answer 36

• the biggest and smallest measurements- the range

- how many measurements you will test

Question 37

what should a plan include?

Answer 37

• the scientific question
• the independent and dependent variables
• the list of variables to control and how
• a prediction
• equipment list
• risk assessment
• how they will use the equipment to produce accurate and precise data

Question 38

what could help organise you data?

Answer 38

a results table

Question 39

if both your independent and dependent variables are continuous then graph should you use?

Answer 39

line graph

Question 40

if your independent variable is categoric which graph should you use?

Answer 40

a bar chart of in some occasions a pie chart

Question 41

what should you do when you draw a chart or plot a graph?

Answer 41

• choose scales so you have a big graph
• use pencil and ruler
• label axes with quantity and unit
• write a title for your graph

Question 42

when you have finished your chart or graph what should you do?

Answer 42

• work out what the graph tells you
• write a conclusion
• compare with your prediction

Question 43

what should a conclusion include?

Answer 43

start by saying what the investigation shows
then describe the relation ship between the two variables
use your graph to support you conclusion

Question 44

what are the two ways to evaluate your investigation?

Answer 44

• discuss the quality of the data you have collected

- suggest and explain improvements to your method

Question 45

what are two example of improvements you can suggest?

Answer 45

• including a bigger range, or taking more readings

- using different apparatus- giving a smaller spread and fewer outliers