Exam 1: Introduction to Statistics

A researcher records the time it takes to complete a memory task in a sample of 25 participants.He finds that the average participant completed the test in 43 s.The average time to complete this task is called a(n)

An animal researcher measures the number of times a rat presses a lever located at the right,center,and left of a cage for a food reward.What scale of measurement is the location of lever pressing?

Descriptive statistics are procedures used to

A health practitioner measures the heart rate (in number of beats per minute)of patients under low,moderate,and high stress levels.Heart rate can be best described as

A characteristic (usually numeric)that describes a sample is called a

______ data describe numeric aspects of phenomena,whereas ______ data describe nonnumeric aspects of data.

Researchers rarely have access to entire populations.How do researchers resolve this limitation?

Each of the following are interval scale measurements,except

A movie critic rates a movie on a scale from one (lowest)to four (highest)stars.What scale of measurement are the ratings?

A researcher tests whether the dosage level of some drugs (low,high)causes significant differences in health.To do this,the researcher randomly assigns rat subjects to receive a low or high dosage of the drug and records health-related measures in both groups.The type of method described is

Procedures that allow researchers to infer or generalize observations made with samples to the larger population from which they were selected best describe

Each of the following is an example of quantitative data,except

An interval scale of measurement is generally more informative than an ordinal scale of measurement.

______ refer(s)to how the properties of numbers can change with different uses.

A researcher identifies college students as a group of interest to test her hypothesis.She then identifies a few local college students and selects a small group of local college students to be observed.In this example,the sample is:

A researcher records the number of alcoholic drinks consumed per week by students living on campus in rural and urban colleges.In this example,the number of alcoholic drinks consumed per week is the dependent variable.

______ are measured along a continuum at any place beyond the decimal point.

A therapist observes that spouses are more likely to forgive their partners for lying to them if they find out the truth from their spouses and not from a third party.In this example,the dependent variable is

A characteristic (usually numeric)that describes a population is called a

Quantitative measures can be