For a certain experiment, the available experimental units are eight people: four females (f) and four males (m). Use (1f, 2f, 3f, 4f) to denote the females and (1m, 2m, 3m, 4m) to denote the males. There are to be four treatment groups: A, B, C, and D. If a randomized block design is used, with the experimental units blocked by gender, which assignment of treatments is correct? (5 points)

erinyak132

Select all of the true statements about a placebo-controlled randomized comparative experiment.

Each experimental subject in a placebo-controlled randomized comparative experiment has an equal probability of being assigned to any of the treatment groups.

The placebo control group is designed to control for bias on the part of the researcher.

A placebo is an inactive substance that appears to be the same as the experimental treatment. The placebo effect is the phenomenon in which subjects report improvement in their condition after taking a placebo.

The experimental design of a placebo-controlled randomized comparative experiment involves dividing subjects into subgroups based on similar characteristics, followed by randomly assigning treatments to subjects within each subgroup.

A placebo control group receives the standard treatment or a diluted treatment. A placebo effect occurs when the placebo yields a positive response from subjects taking it.

greywolf854

The Process of Science

1. After formulating a hypothesis, a scientist

(a) proves the hypothesis to be true or false.

(b) test the hypothesis

(c) decides how to best avoid having a control

(d) makes sure environmental conditions are just right

(e) formulates a scientific theory

2. Experiments examine the contribution of the .........to the observation.

(a) respeonding variable

(b) control group

(c) standard deviation

(d) experimental variable

3. Which of the following is not correctly linked?

(a) model: a representation of an experiment

(b) standard deviation: a from of statistical analysis

(c) principle: a theory that is not supported by experimental evidence

(d) data: the results of an experiment or observation.

Challenges Facing Science:

4. Which of the following applies scientific knowledge to the needs of society?

(a) evolution

(b) taxonomy

(c) systematics

(d) technology

5. Which of the following represents the permanent loss of a species?

(a) natural selection

(b) greenhouse effect

(c) extinction

(d) climate change.

6. and SARS are examples of

(a) extinct species

(b) forms of greenhouse gases

(c) endangered habitats.

(d) emerging diseases.

taupebat34

	A: (1f, 3m), B: (2f, 2m), C: (3f, 1m), D: (4f, 4m)
	A: (2m, 1m), B: (1f, 2f), C: (3f, 3m), D: (4f, 4m)
	A: (3m, 1m), B: (2f, 4f), C: (3f, 1f), D: (4m, 2m)
	A: (1f, 3f), B: (2f, 2m), C: (4f, 1m), D: (4m, 3m)

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