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.

x/3-10=8

x/3=18

x=48

  the correct choice is marked

step-by-step explanation:

the first two graphs show multiple turning points. the last graphs matches the description in every detail.