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6 Cards in this Set

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WHAT IS AN INFERENCE

The use of randomization in sampling allows for the analysis of results using the methods ofstatistical inference. Statistical inference is based on the laws of probability, and allows analysts to infer conclusions about a given population based on results observed through random sampling.

VARIABILITY OF SAMPLES

The use of randomization in sampling allows for the analysis of results using the methods of statistical inference. Statistical inference is based on the laws of probability, and allows analysts to infer conclusions about a given population based on results observed through random sampling. Two of the key terms in statistical inference are parameter and statistic:

DBM , OVS & HOW TO CALCULATE

The Distance Between Medians (DBM) as a percentage of Overall Visible Spread (OVS)(LOWER QUARTILE TO UPPER QUARTILE OF BOTH) BDM/OVS x 100/1 = C




For a sample size of 30 if this percentage is over 33% there tends to be a difference between A and B(C)


For a sample size of 100 if this percentage is over 20%(C) there tends to be a difference between A and B


For a sample size of 1000 if this percentage is over 10%(C) there tends to be a difference between A and B




SKEWS

When there is a dropoff the to right we call this a skew to the right vice versa...

DESCRIBING

When making a comparison between two groups…




“I notice that…”Central Tendencies – mean, median, mode (with numerical values) and bycomparing the box-plotsSpread– Inter Quartile Range and the Box-Plot middle 50%Example“I wonder if there is a difference in the current median age of members of the Nelson Badminton club and the Nelson Chess club?”

UNIMODAL & BIMODAL & MULTIMODAL

Unimodal distributions have one peak or "mode."




Bimodal distributions have two peaks (doesnt have to be both big - a medium sized peak and a large peak...)




Multimodal looks at 3 or more peaks in a dot plot