Language and Use of Statistics

NZ Level 7 (NZC) Level 2 (NCEA)

Sources of Errors

Tina wants to know which new smart phone she should buy and decides to base her decision on other people’s opinions. She decides to interview some people at the Retirement Home where her grandparents live one Sunday afternoon.

a

Is this an example of Sampling Error or Measurement Error?

Sampling error

A

Measurement error

B

Sampling error

A

Measurement error

B

b

What type of Sampling Error is this?

The sample is too small

A

The sample is not random

B

The sample does not adequately represent the population.

C

The sample is too small

A

The sample is not random

B

The sample does not adequately represent the population.

C

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Carry out investigations of phenomena, using the statistical enquiry cycle: A conducting surveys that require random sampling techniques, conducting experiments, and using existing data sets B evaluating the choice of measures for variables and the sampling and data collection methods used C using relevant contextual knowledge, exploratory data analysis, and statistical inference.

S7-3 Evaluate statistically based reports: A interpreting risk and relative risk B identifying sampling and possible non-sampling errors in surveys, including polls

Conduct an experiment to investigate a situation using statistical methods

Evaluate a statistically based report