levo

Data Recording, Analysis and Presentation

Normal and skewed distributions and probability

  • 3 things to know
  • Component 01

Overview

Recall questions on the purpose of inferential tests, the normal distribution, positively and negatively skewed distributions and where the mean, median and mode lie, and probability in research findings.

What you need to know

Answer each one before you reveal it.

Your recallNot started
Key term

What is the purpose of an inferential statistical test?

Key term

Where do the mean, median and mode lie in a normal distribution?

Key term

What is a positively skewed distribution?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    What is the purpose of an inferential statistical test?

    Model answer

    To judge how likely it is that the results occurred by chance, and so whether the null hypothesis can be rejected.

  2. 2

    Describe the shape of a normal distribution curve.

    Model answer

    It is a symmetrical bell shape, with most scores clustered around the centre and progressively fewer towards each tail.

  3. 3

    Where do the mean, median and mode lie in a normal distribution?

    Model answer

    All three fall at the same point, at the centre of the curve.

  4. 4

    What is a positively skewed distribution?

    Model answer

    A distribution in which most scores are low and a long tail of high scores stretches out to the right.

  5. 5

    In a positively skewed distribution, how are the mode, median and mean positioned relative to one another?

    Model answer

    The mode lies at the peak on the left, the median comes next, and the mean is pulled furthest to the right by the extreme scores.

  6. 6

    What is a negatively skewed distribution?

    Model answer

    A distribution in which most scores are high and a long tail of low scores stretches out to the left.

Other ways to work this

The same content, four other ways.

What is inside Levo

Six ways to work the same material.

1Closed book
2Open book
3Closed book

The 3-step method, run for you

Answer cold, learn it, then prove it stuck. Levo tracks the jump between your first attempt and your last.

Research Methods and Techniques
Planning and Conducting Research
Data Recording, Analysis and Presentation
Report Writing and Scientific Communication

Cram a whole paper in one sitting

Sort every topic into what you know and what you do not, then drill only the weak ones.

The tests are a old.
centurydecadeyear

Blank Blitz makes facts automatic

Rapid timed gap-fills on the terms and numbers you need to recall without thinking.

APunishment requires deprivation, loss of autonomy and stigma.
BReform requires trust, responsibility and self-respect.
CThe regime that achieves one tends to undermine the other.

Build It gets the exam shape right

Assemble a full-mark answer from its marking points, in the order an examiner wants them.

Range means the highest score minus the lowest score.
TrueFalse

Test It catches misconceptions

Spot the fault in a statement. The traps are the mistakes students actually make.

721941163128510

Brain Breaks between sessions

Short focus games to reset attention, so the next set lands better than the last.

Every question in Data Recording, Analysis and Presentation, on a schedule.

Attempt a question from memory, write the correct version, then attempt it again. Levo records the jump between your first attempt and your last, and brings each question back on the day you are due to forget it.

Or £46 a year, about £3.83 a month. Cancel anytime.