Question: Select the correct statement regarding experiments. A researcher can carefully control the explanatory variables and observe human responses. A researcher can ignore explanatory variables and

Select the correct statement regarding experiments.

A researcher can carefully control the explanatory variables and observe human responses.
A researcher can ignore explanatory variables and observe human responses.
A researcher can carefully control the explanatory variables but not observe human responses.
A researcher can observe the explanatory variables but not control human responses.

Maria flipped a coin 60 times, and the coin came up tails 32 times.

What is the relative frequency of the coin turning upheadsin this experiment?Answer choices are rounded to the hundredths place.

1.88
0.47
0.53
2.14

A sports trainer is going to do experiment on the effect of Vitamin D supplements and his athletes.He randomly assigns all of his patients to either take Vitamin D supplements or take a placebo.

What type of experimental design does this situation illustrate?

Randomized Block
Matched-Pair
Simple Random
Completely Randomized

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