Data recording, analysis and presentation (descriptive statistics)

Question 1

Mode median mean

Answer 1

Three. Measures of central tendency

Question 2

Variance, range, standard deviation

Answer 2

Measures of dispersion

Question 3

What is a tally chart (e,g, of ….)

Answer 3

Frequency table

Question 4

Advantage and disadvantage of mean

Answer 4

Involve all data

Include outliers, which May skew result
Can you give us decimal figures (more complex)

Question 5

Disadvantage and advantage of median

Answer 5

Discount outliers, so not skewed

Doesn’t Include all data collected
Maybe decimal figures (more complex)

Question 6

Advantage and disadvantage of mode

Answer 6

Easy to calculate
Always a whole number
Can be done with qualitative data (word used the most)

Maybe none or more than one mode (can’t conclude)
Doesn’t include all data collected

Question 7

Advantage and disadvantage of range

Answer 7

Easy to calculate
Quick to Know how dispersed data is

Didn’t take account of all values
Affected by outliers
Doesn’t give indication to whether the spread of data is evenly distributed

Question 8

Advantage and disadvantage of variance

Answer 8

Take account of all values in a data set
Not affected by outliers to the same extent

The figure that this calculate it is not being expressed in the same unit that data in original data set
Time-consuming , difficult

Question 9

Advantage and disadvantage of standard deviation

Answer 9

Take in the count of all values in dataset
Not affected by outliers
Being expressed in the same unit that the data in the original data set

Time consuming
more difficult to calculate the range score
Difficult to draw a conclusion without data from another set to compare with
Need data from couple different data set to say if it’s got wide or narrow range

Question 10

Calculation of variance

Answer 10

Calculate the mean score
Subtract it mean score from their score = d
Square d
Add all d^2 tgt
Divide by (n-1)

Question 11

Calculation of standard deviation

Answer 11

Square root of variance

Question 12

How can measure of dispersion represent in graphs?

Answer 12

Range bars on bar chart
Normal distribution

Question 13

Difference between histogram and bar chart

Answer 13

Continuous data vs uncontinuous data
Frequency density (area represents frequency, ) vs frequency
Unequal class width vs equal class width
No gaps vs have gaps