Which of the following sample types should you always regard as unreliable? a) voluntary response samples 18) 9 simple random samples b) stratified samples d) eluster samples 19) statistics is the science of conducting studies to a) solve a system of equations

The type of sample that can be considered unreliable is type (a), in which responses are voluntary.

Step-by-step explanation:

The type of sample that can be considered unreliable is type (a), in which responses are voluntary.

It can be considered unreliable because being voluntary, the answers will give a biased result and the analysis will not be valid.

The rest of the options, if the necessary collections are taken, are samples that can be considered reliable.

expression #3 is not equivalent. the others are.

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