LCOL Statistics

Leaving Cert Ordinary Level Maths LCOL Statistics

LCOL Statistics

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Key ideas in this topic

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Primary vs secondary data

Primary = you collected it yourself; secondary = data someone else collected.

LCOL Statistics 1

IQR — IQRLCOL Statistics 10

Line plot — Line plot

Stack one X above the number line for each data value; the tallest stack is the mode.

LCOL Statistics 13

Pie chart — Pie chart

Each sector angle = (frequency ÷ total) × 360°; the angles must add to 360°.

LCOL Statistics 14

Bar chart (discrete data) — Bar chart (discrete data)

One bar per value with a GAP between bars; the height is the frequency.

LCOL Statistics 15

Histogram (continuous data) — Histogram (continuous data)

Bars touch with NO gaps because the data is continuous; estimate the mean from mid-interval values.

LCOL Statistics 16

Stem-and-leaf plot — Stem-and-leaf plot

Split each value into a stem and a leaf (32 → 3 | 2). Always include a KEY.

LCOL Statistics 17

The empirical rule (68–95–99.7) — The empirical rule (68–95–99.7)

68% of the data lies within μ ± σ, 95% within μ ± 2σ and 99.7% within μ ± 3σ. Only works for a normal (bell) curve.

LCOL Statistics 21

Margin of error — Margin of errorLCOL Statistics 22

Confidence Intervals — Confidence IntervalsLCOL Statistics 23

95% confidence interval — 95% confidence intervalLCOL Statistics 24

Types of data — Types of data

Numerical splits into discrete and continuous; categorical splits into nominal and ordinal.

LCOL Statistics 3

Mean — MeanLCOL Statistics 6

Median position — Median positionLCOL Statistics 8

Range — RangeLCOL Statistics 9

Topic Content

0% Complete 0/23 Steps

LCOL Statistics 1: Statistics Definitions

LCOL Statistics 2: Surveys

LCOL Statistics 3: Types of data

LCOL Statistics 4: Simple Random Sampling

LCOL Statistics 6: Mean

LCOL Statistics 7: Mode

LCOL Statistics 8: Median

LCOL Statistics 9: Range

LCOL Statistics 10: Interquartile Range

LCOL Statistics 11: Standard Deviation

LCOL Statistics 12: Frequency Tables

LCOL Statistics 13: Line Plot

LCOL Statistics 14: Pie Charts

LCOL Statistics 15: Bar Charts

LCOL Statistics 16: Histograms

LCOL Statistics 17: Stem and Leaf Plots

LCOL Statistics 18: Scatter Graphs

LCOL Statistics 19: Correlation versus Causality

LCOL Statistics 20: Skewed Data

LCOL Statistics 21: Empirical Rule

LCOL Statistics 22: Margin of Error

LCOL Statistics 23: Confidence Intervals

LCOL Statistics 24: Hypothesis Testing