If a researcher depends on census data to select a sample of individuals from a population, which of the following are likely to be underrepresented?
a. people who are housebound c. minorities
b. people who work for a living d. people who are hard to reach
In order to estimate the ratio of white to black students in his college, a professor determines the proportion of whites and blacks in his class. The students in the professor's class are called a _________.
a. sample c. statistic
b. population d. parameter
Random digit dialing is a sampling techniques that was developed in order to _____.
a. obtain random samples c. check internal validity
b. obtain matched samples d. check external validity
In order to estimate the ratio of white to black students in his college, a professor determines the proportion of whites and blacks in his class. The resulting proportion is called a _________.
a. population c. parameter
b. sample d. statistic
If a sample is not representative of the population, then _____.
a. respondents will probably not answer the survey questions
b. the results cannot be generalized to the population
c. any causes that could have been identified by the study will remain hidden.
d. a case study should be used to determine cause-effect relationships instead
In order to estimate the attention level of college undergraduates in the United States, a psychologist measures the attention span of the undergraduates at a local university. The undergraduates at the local university are a _________.
a. parameter c. sample
b. population d. statistic
In order to select a stratified random sample of 500 individuals from a population of 25000 individuals in which 15 are seniors, 19 are juniors, 20 are sophomores, and 46 are freshmen, _____ juniors should be included in the sample.
a. 95 c. 190
b. 75 d. 7.50
In order to estimate the attention level of college undergraduates in the United States, a psychologist measures the attention span of the undergraduates at a local university. The mean of these scores is a _________.
a. parameter c. statistic
b. population d. sample
If 15 of the individuals in the population are seniors, 19 are juniors, 20 are sophomores, and 46 are freshmen, a representative sample will have _____ juniors.
a. 46 c. 19
b. 20 d. 15
In order to estimate the height of all students at your university, let's assume you have measured the height of all psychology majors at the university. The average (mean) value of the measured height scores constitutes a _________.
a. population c. parameter
b. sample d. statistic
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