Statistics Quiz # 2

Significant findings indicate that the results of the experiment are not real and by chance.

True

False

A stratified sample is a sample in which people or objects are included in the sample in varying proportion to their frequency in the subgroups that make up the population.

True

False

A good theory should _____

Be provocative

Be compelling

Should generate testable hypotheses

All of these

Bar graph is a graph that often represents nominal data in_____

Lines

Dots

Rectangular columns

All of these

Bimodal distribution is a frequency distribution that has distinct twin peaks that do not need to be the exact same height.

True

False

Cumulative frequency is the frequency distribution where the distribution of scores is progressively represented by the _____

Discrete frequency

Total frequency

Both

None

Frequency distribution is a set of scores arranged in order of _____ along the x-axis, with the frequency of each score represented along the y-axis.

Interval

Magnitude

Percentile

None of these

Frequency histogram is a graphic representation of a set of scores where the individual scores are represented by a_____ whose height corresponds to the frequency of the score.

Line

Dot

Bar

All of these

A graphic representation of a frequency distribution where the individual scores are grouped into class intervals is known as_____

Frequency polygon

Frequency histogram

Frequency bar graph

None of these

Kurtosis is the _____ of the overall shape of a frequency distribution.

Peakedness

Flatness

Both

None

Leptokurtosis is a frequency distribution that has a tendency_____

Toward peakedness

Toward flatness

Of equal distribution

All of these

Mesokurtosis is a frequency distribution that is_____

Toward peakedness

Toward flatness

Of equal distribution

All of these

Multivariate indicates _____

Multiple independent variables

Multiple dependent variables

Both

None

Negative skew is an asymmetrical frequency distribution whose right tail is longer than the left tail.

True

False

The shape of normal curve resembles_____

Box

Bell

Ball

All of these

Percentiles is a distribution that is _____ into hundredths.

Added

Multiplied

Divided

Any of these

Platykurtosis is a frequency distribution that has a tendency _____

Toward peakedness

Toward flatness

Of equal distribution

All of these

Positive skew is an asymmetrical frequency distribution whose right tail is longer than the left tail.

True

False

Quartiles is a frequency distribution that is divided into_____

Fourths

Eights

Forties

All of these

An asymmetrical frequency distribution where either the right tail or the left tail is much longer than the other is known as_____

Stem and leaf plot

Bell shaped curve

Hyperbola

Skewed distribution

A horizontal representation of a frequency distribution where all of the individual scores are preserved is known as_____

Skewed curve

Normal curve

Stem and leaf plot

None of these

Univariate is a term that usually indicates a single dependent variable is the focus of study, although multiple independent variables may be involved.

True

False

According to the central limit theorem if the scores in the population are not normally distributed, then the sampling distribution of means will not normally be distributed as the sample size gets larger.

True

False

According to empirical rule, approximately_____ % of all normally distributed scores will fall within ±1 standard deviation of the mean.

68

95

98

99

According to empirical rule, approximately_____ % of all normally distributed scores will fall within ±2 standard deviation of the mean.

68

95

98

99

According to empirical rule, approximately 99% of all normally distributed scores will fall within _____ standard deviations of the mean.

±1

±2

±3

None of these

Equivocal results are the test outcomes that are

Unclear

Uncertain

Unreadable

All of these

Intermediate results is a condition when a test’s outcome is _____

Only positive

Only negative

Either positive or negative

Neither positive nor negative

Intermediate results is a condition when a test’s outcome is _____

Only positive

Only negative

Either positive or negative

Neither positive nor negative

Klinker is a term used for a datum that is_____

Wrong

Inappropriate

Slightly different

Both a and b