1 Identify the data sets level of measurement the ratings of

1. Identify the data set\'s level of measurement. the ratings of a movie ranging from \"poor\" to \"good\" to \"excellent\"

ordinal

nominal

ratio

interval

2.

Identify the data set\'s level of measurement.

the final grades (A, B, C, D, and F) for students in a statistics class

interval

nominal

ordinal

ratio

3. Determine whether the study is an observational study or an experiment.

A medical researcher obtains a sample of adults suffering from diabetes. She randomly assigns 67 people to a treatment group and 67 to a placebo group. The treatment group receives a medication over a period of three months and the placebo group receives a placebo over the same time frame. At the end of three months the patients\' symptoms are evaluated.

experiment

observational study

Solution

Firts it is necessary to know:

Nominal measurement.

At this level of measurement distinct categories that do not involve a specific order they are established. For example, if the unit of analysis is a group of people, to classify you can set the category sex with two levels, male (M) and female (F), respondents only have to indicate their gender is not required of a actual order.

Thus, if numbers are assigned to these levels only serve for identification and may be indistinct: 1 = M 2 = F or, you can invert the numbers without affecting the measurement: 1 = F y 2 = M. In short numbers in the nominal scale events in order to identify allocated. There is no quantitative benchmark. It used to name the units of analysis in research and is used in prisons, schools, sports, etc. The logical connection is expressed: A B (A is different from B).

b) Measurement Ordinal.

Categories with two or more levels that involve an inherent order each are set. Ordinal scale measurement is quantitative because you can sort the events based on the degree of possession of an attribute or characteristic. For example, in the schools of basic level stature usually formed by students, a quantitative order develops but does not provide measures of the subjects. The logical relationship expresses this scale is A B (A is greater than B). Sort a group of people by social class they belong to a prescribed order implies that goes from the highest to the lowest.

ANSWER

1.Ordinal

2.normal

3.Observational study