Data analysis

Question 1

State the strength of using the mean as the measure of central tendancy

Answer 1

One strength of this method of central tendancy is that all of the data is used to calculate the answer. Therefore it is an accurate representation of the data.

Question 2

State the weakness of using the mean as the measure of central tendancy

Answer 2

One weakness is that extreme scores can distort the value. Therefore, it is not an appropriate measure of central tendancy if our data set is skewed.

Question 3

State the strength of using the median as the measure of central tendancy

Answer 3

One strength is that extreme scoes do not distort the value. Therefore it is a robust measure of central tendancy if our data set is skewed by extreme values.

Question 4

State the weakness of using the median as the measure of central tendancy

Answer 4

Weakness could be that it is difficult and time consuming to calculate with a large data set. it is a less representative measure of central tendancy because it does not depend on all the items in the data

Question 5

State the strength of using the mode as the measure of central tendancy

Answer 5

One strength of using this method is that it is the only measure of central tendancy we can use when data is not numerical. Therefore, it allow for analysis of the most commonly occurring category

Question 6

State the weakness of using the mode a sthe masure of central tendancy

Answer 6

One weakness is that this measure of central tendancy may not accurately reflect the data set. Therefore, if there is no most popular answer the measure of central tendancy is effectively useless

Question 7

Define measure of central tendancy

Answer 7

An average of the data set

Question 8

Define descrete data

Answer 8

Data that can be separated into separate categories

Question 9

Define continuous data

Answer 9

Cannot be placed into distinct categories and can be presented on a number line

Question 10

State the rules for using and plotting a line graph

Answer 10

• Used for continuous data
• Useful for comparing 2 or more conditions
• Good for looking at changes over time
• Frequency/measurements are on the Y axis
• Data points are connected with a straight line
• Label the ends of the lines

Question 11

State the rules for using and drawing pie charts

Answer 11

• Used for discrete data
• Shows relative contribution to overall total
• Used for 6 categories or fewer
• Useful when data is showing a percentage

Question 12

State the rules for using and plotting a bar chart

Answer 12

• Used for disctrete data
• Columns do not touch
• Useful for coparing groups of data
• Useful for categories
• The mean/frequency is on Y axis
• The category is on the X axis
• Labels on each axis
• Title

Question 13

State the rules for using and plotting scatter graphs

Answer 13

• Used for cotinuous data
• Used for measuring the relationship between two variables (a correlation)
• Shows a positive, negative or no correlation