Week 1 stats

Using a systematic sample guarantees that members of each group within a population will be sampled. -True. -False. Using a cluster sample guarantees that members of each group within a population will be sampled. -False. Using a stratified sample guarantees that members of each group within a population will be sampled.

False. Using a stratified sample guarantees that members of each group within a population will be sampled.

Why is a sample used more often than a population? It is usually impossible to count the entire population. Sample statistics are more accurate than the population parameter. Inferences cannot be made when using the population. All samples are representative of a​ population, so the population does not need to be used.

It is usually impossible to count the entire population

In what studies does the researchers measure, but don't influence, the sample of interest

Observational studies

The personnel director at a large company would like to determine whether the company cafeteria is widely used by employees. She calls each employee and asks them whether they usually bring their own​ lunch, eat at the company​ cafeteria, or go out for lunch.

Observational study

A survey of one quarter of an audience for a game show Population, because it is a subset of all people in the audience Sample, because the collection of surveys for one quarter of the audience is a subset of all people in the audience Sample, because it is a collection of surveys for all membranes of the audience, but there are other game show audiences Population, because it is a collection of surveys for all members of the audience

Sample, because the collection of surveys for one quarter of the audience is a subset of all people in the audience

What data can't be measured mathematically and includes things like city of residence, hair color, favorite sports team, etc.

Qualitative Data

Social Security numbers The variable is ____________ because social security numbers are ___________________

Qualitative; attributes or labels

What data can be compared mathematically and includes things like height, income, temperature, rainfall...

Quantitative data

Heights of trees in a forest The variable is _________ because heights are _____________

Quantitative; numerical measurements

What is replication in an​ experiment? Why is replication​ important? -Replication is repetition of an experiment under different conditions. Replication is important because it reduces the validity of the results. -Replication is repetition of an experiment under different conditions. Replication is important because it enhances the validity of the results. -Replication is repetition of an experiment under the same or similar conditions. Replication is important because it reduces the validity of the results. -Replication is repetition of an experiment under the same or similar conditions. Replication is important because it enhances the validity of the results.

Replication is repetition of an experiment under the same or similar conditions. Replication is important because it enhances the validity of the results.

Favorite TV show Is the variable qualitative or quantative? The variable is qualitative because a favorite TV Show describes an attribute or characteristic The variable is qualitative because a favorite TV Show is found by measuring or counting The variable is quantitative because a favorite TV Show describes an attribute or characteristic The variable is quantitative because a favorite TV Show is found by measuring or counting

The variable is qualitative because a favorite TV Show describes an attribute or characteristic

Favorite musical style Is the variable qualitative or quantitative The variable is qualitative because a favorite musical style describes an attribute or characteristic The variable is qualitative because a favorite musical style is found by measuring or counting The variable is quantitative because a favorite musical style describes an attribute or characteristic The variable is quantitative because a favorite musical style is found by measuring or counting

The variable is qualitative because a favorite musical style describes an attribute or characteristic

State of residence The variable is quantitative because state of residence describes an attribute or characteristic The variable is qualitative because state of residence is found by measuring or counting The variable is qualitative because state of residence describes and attribute or charactertics The variable is quantitative because state of residence is found by measuring or counting

The variable is qualitative because state of residence describes and attribute or charactertics

A parameter is a numerical description of a __________characteristic. A statistic is a numerical description of a _________characteristic.

population; sample

A statistic is a measure that describes a population characteristic. True. False. A statistic is a measure that describes a sample characteristic. False. A statistic is the science of​ collecting, organizing,​ analyzing, and interpreting data in order to make decisions

False. A statistic is a measure that describes a sample characteristic.

What is the difference between a census and a​ sampling? Both a census and a sampling include the entire​ population, but a census orders the population according to some list. A sampling includes the entire population. A census includes only part of the population. A census includes the entire population. A sampling includes only part of the population. A census splits the population into two or more groups and includes every member of one of those groups. A sampling only includes some members of that group.

A census includes the entire population. A sampling includes only part of the population.

In what studies in which the sample is given a treatment, and is divided into a treatment group and a control group

Experiments

A sample statistic will not change from sample to sample. The statement is false. A population statistic will not change from population to population. The statement is false. A sample statistic can change from sample to sample. The statement is false. A sample parameter will not change from sample to sample. The statement is true.

The statement is false. A sample statistic can change from sample to sample.

A​ double-blind experiment is used to increase the placebo effect. -The statement is false. Double blinding is used to increase the randomization. -The statement is false. Double blinding is used to decrease the placebo effect. -The statement is true. -The statement is false. Double blinding has no effect on the placebo effect.

The statement is false. Double blinding is used to decrease the placebo effect