question

statistic

answer

A __________ is a numerical summary of a sample.

question

parameter

answer

A __________ is a numerical summary of a population.

question

matched

answer

A matched-pairs design is an experimental design in which the experimental units are ___________.

question

lurking variable

answer

A _____________ is an explanatory variable that was not considered in a study, but that affects the value of the response variable in the study.

question

Simple random sampling

answer

__________ is the process of using chance to select individuals from a population to be included in the sample.

question

1

answer

In a relative frequency distribution, the sum of relative frequencies should be ______.

question

residual

answer

A ______ is the difference between the corresponding observed and predicted values.

question

2

answer

The first quartile of the data 2, 4, 6, 6, 8, 9, 9, 10 is _________.

question

68%

answer

For a bell-shaped data distribution, __________ of data are within one standard deviation of the mean.

question

2

answer

The mean and standard deviation of a sample are 12 and 3, respectively. The z-score of the data 18 is _________.

question

True

answer

Inferences based on voluntary response samples are generally not reliable.

question

True

answer

If the results of the sample are not representative of the population, then the sample has bias.

question

True

answer

Generally, the goal of an experiment is to determine the effect that treatments will have on the response variable.

question

False

answer

A data set will always have exactly one mode.

question

True

answer

The 75th percentile is the value that separates the lower 75% of data from the upper 25%.

question

False

answer

The correlation coefficient r between two variables x and y can be +2 .

question

True

answer

A designed experiment is a controlled study conducted to determine the e ect that varying
one or more explanatory variable has on a response variable.

question

True

answer

If the scatter diagram of the residues has a pattern, then the least-squares regression line is
not the appropriate model.