Reference no: EM132846630

1. Determine which of the four levels of measurement? (nominal, ordinal,? interval, ratio) is most appropriate for the data below.

People's ages

Choose the correct answer below.

A. The nominal level of measurement is most appropriate because the data cannot be ordered.

B. The interval level of measurement is most appropriate because the data can be ordered, differences (obtained by subtraction) can be found and are meaningful, and there is no natural starting point.

C. The ordinal level of measurement is most appropriate because the data can be ordered, but differences (obtained by subtraction) cannot be found or are meaningless.

D. The ratio level of measurement is most appropriate because the data can be ordered, differences (obtained by subtraction) can be found and are meaningful, and there is a natural starting zero

2. Identify the level of measurement of the? data, and explain what is wrong with the given calculation.

In a set of? data, car rankings are represented as 0 for first, 1 for second, and 2 for third. The average? (mean) of the 507 car rankings is 0.9.

The data are at the ____ level of measurement.

A.nominal
B. ordinal
C. interval
D.ratio

3. A study of an association between which ear is used for cell phone calls and whether the subject is? left-handed or? right-handed began with a survey? e-mailed to 5000 people belonging to an otology online? group, and 717 surveys were returned.? (Otology relates to the ear and? hearing.) What percentage of the 5000 surveys were? returned? Does that response rate appear to be? low? In? general, what is a problem with a very low response? rate?

Of the 5000? surveys, ?___% were returned. This response rate ?( appears/does not appears)to be low.

4. Identify which of these types of sampling is? used: random,? systematic, convenience,? stratified, or cluster.

To determine her air quality?, Jean divides up her day into three? parts: morning,? afternoon, and evening. She then measures her air quality at 3 randomly selected times during each part of the day.

What type of sampling is? used?

A.Stratified

B.Systematic

C.Convenience

D.Random

E.Cluster

5. Determine whether the study is an experiment or an observational? study, and then identify a major problem with the study.

A study involved? 22,071 male physicians. Based on random? selections, 11,037 of them were treated with aspirin and the other? 11,034 were given placebos. The study was stopped early because it became clear that aspirin reduced the risk of myocardial infarctions by a substantial amount.

This is an ?(experiment/observational study) because the researchers ?(do not attempt to modify/apply a treatment to)the individuals.