Question

1 pt) for each problem, select the best response. (a) a _____ is a characteristic or property of an individual experimental (or observational) unit.

a. variable
b. black box
c. sample
d. none of the above. (b) a _____ is the set of all units from which a researcher would be interested in obtaining data.
a. unit
b. population
c. sample
d. none of the above. (c) _____ is an estimate or prediction or other generalization about a population based on information contained in a sample
a. a variable
b. an experiment
c. a statistical inference
d. none of the above. (d) _____ is an object (person, thing, etc.) upon which we collect data.
a. an experimental (or observational) unit
b. a variable
c. the mean.
d. none of the above.

Answer 1

1. Answer;

Variable

Step-by-step explanation;

-A variable is a characteristic or property of an individual experiment (or observational) unit in the population.

-A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.

-The independent variable is the one that is changed by the scientist. The dependent variables are the things that the scientist focuses his or her observations on to see how they respond to the change made to the independent variable. Controlled variables are quantities that a scientist wants to remain constant, and she or he must observe them as carefully as the dependent variables.

2. Answer;

-Population;

Explanation;

-A population is a set of units (usually people, objects, transactions, or events) that we are interested in studying. (It must include ALL the units.)

-In statistics, a population is a set of similar items or events which is of interest for some question or experiment. For example, if we are studying the weight of adult women, the population is the set of weights of all the women in the world.

3. Answer;

A statistical inference

Explanation;

Statistical inference is an estimate, prediction, or some other generalization about a population based on information contained in a sample. Statistical inference is the use of probability theory to make inferences about a population from sample data.

-Statistical inference aims at learning characteristics of the population from a sample; the population characteristics are parameters and sample characteristics are statistics.

4. Answer;

Experimental (or observational) unit

Explanation;

-Experimental (or observational) unit is an object (e.g., person, thing, transaction, or event) about which we collect data. The experimental unit is the physical entity which can be assigned, at random, to a treatment.

-The experimental unit is also the unit of statistical analysis. However, any two experimental units must be capable of receiving different treatments.