2022-2024 Year 13 A-Level Psychology - Research Methods: Descriptive Statistics KR Part 2
This deck covers key concepts in descriptive statistics, focusing on range and standard deviation, as well as calculations of mean, median, mode, and range.
What is meant by range?
Key Terms
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| Term | Definition |
|---|---|
What is meant by range? | spread of scores from smallest to largest |
How do we calculate the range? | subtract the lowest value from the highest value and add 1 |
What level of measurement uses range? | ordinal |
What measure of dispersion is involved in ordinal data? | range |
A03: what is a strength of using range? | it is easy and quick to calculate |
A03: Why is the range quick and easy to calculate? | it only uses 2 pieces of the data to calculate |
A03: What is a weakness of using the range? | it can be distorted by extreme scores |
A03: Why can the range be distorted by extreme scores? | it only takes into account the smallest and largest values |
A03: By only taking into account the smallest and largest values, what could this do to the interpretation of data when using range? | it provides an inaccurate range and therefore an inaccurate interpretation |
What is meant by standard deviation? | the spread of data around the mean |
How do we interpret a large standard deviation? | the larger the spread of data around the mean |
What does a large spread of data show us? | that there is less consistency in scores and more individual differences |
Why does a large spread of data show us that there is more individual differences? | because less participants have met the mean score which shows that the IV has not affected participants in the same way |
How do we interpret a small standard deviation? | a smaller spread of data around the mean |
What does a small spread of data show us? | that there is more consistency and less individual differences |
Why does a smaller standard deviation show us more consistency in data? | because all the scores are clustered around the mean |
What level of measurement uses standard deviation? | interval data |
What measure of dispersion does interval data use? | standard deviation |
What is meant by 1 standard deviation? | they are 1 interval/ standard deviation away from the mean score |
A03: what is a strength of using standard deviation? | it is more precise and sensitive measure |
A03: Why is standard deviation more sensitive and precise? | it uses all the scores making it a more accurate measure of dispersion than range |
A03: Why is standard deviation less likely to be distorted by extreme scores? | it focusses on the distance of each score from the mean rather than from the highest to the lowest |
A03: what is a weakness of using standard deviation? | it is more complicated and time consuming |
A03: Why is standard deviation complicated and time consuming? | the calculation is lengthy |
How are descriptive statistics displayed | in a graph/table |
Work out the Mean, Median, Mode and Range from the data below | Mean: 45; Median: 30.5; Mode: 12; Range: 86 |
Work out the Mean, Median, Mode and Range from the data below | Mean: 69.7; Median: 82; Mode: 92; Range: 60 |
Work out the Mean, Median, Mode and Range from the data below | Mean:17.5; Median: 4; Mode: 4; Range:74 |
Work out the Mean, Median, Mode and Range from the data below | Mean: 42.5; Median: 28.5; Mode: 11; Range: 92 |
Work out the Mean, Median, Mode and Range from the data below | Mean: 43.1; Median: 43.5; Mode: 65; Range: 45 |
Work out the Mean, Median, Mode and Range from the data below | Mean: 50.5; Median: 39; Mode: 34; Range: 52 |
Work out the Mean, Median, Mode and Range from the data below | Mean: 23.3; Median:22; Mode: 22; Range:5 |
Work out the Mean, Median, and Range from the data below | Mean:57.8; Median:67; Range:86 |
Work out the Mean, Median, Mode and Range from the data below | Mean:42.8; Median:44; Mode:61; Range:48 |
Work out the Mean, Median, Mode and Range from the data below | Mean:36.7; Median:34.5; Mode:32; Range:17 |
Work out the Mean, Median, Mode and Range from the data below | Mean:18; Median:18; Mode:18; Range:8 |
Work out the Mean, Median, and Range from the data below | Mean:28.3; Median:23.5; Range:51 |