Z-Scores (Leaving Cert Mathematics): Flashcards

📚Flashcards
Revision NotesModel AnswersQuizzesFlashcardsExam Questions
Z-Scores
Sign up to keep revising.Create a free account to study more flashcards and track your progress.

Practise the cards

12 cards from this deck

Show

Z-score definition

Measures standard deviations a data point is from the mean

Z-score formula

Z=X−μσZ = \frac{X - \mu}{\sigma}

In Z-score formula, what is XX?

The data value

In Z-score formula, what is μ\mu?

The mean of the dataset

In Z-score formula, what is σ\sigma?

The standard deviation of the dataset

Meaning of Z=0Z = 0

Data point equals the mean

Meaning of positive Z-score

Value is above the mean

Meaning of negative Z-score

Value is below the mean

Z-score application: comparing data

Allows comparison of data from different distributions

Z-score application: probabilities

Used with Z-tables to find cumulative probability

Z-score threshold for outliers

Z<−3Z < -3 or Z>3Z > 3

Purpose of Z-scores

Standardises data for comparison across datasets

Explore Leaving Cert Mathematics Revision Notes by Topics

Empirical Rule

Standard Deviation

Normal Distributions/Z-Scores

Explore Leaving Cert Mathematics Model Answers by Topics

Empirical Rule

Standard Deviation

Normal Distributions/Z-Scores

Explore Leaving Cert Mathematics Quizzes by Topics

Empirical Rule

Standard Deviation

Normal Distributions/Z-Scores

Explore Leaving Cert Mathematics Exam Questions by Topics

Empirical Rule

Standard Deviation

Normal Distributions/Z-Scores

Join 100,000+ Leaving Cert students studying Flashcards with us.

Select your subjects, and get access to A+ resources today.