Control$1.$ Statistics branches include

A$)$ descriptive Statistics

B$)$ inferential Statistics

C$)$ Industry Statistics

D$)$ Both A and B

$2.$ Individual respondents, focus groups, and panels of respondents are categorized as

A$)$ Primary Data Sources

B$)$ Secondary Data Sources

C$)$ Itemized Data Sources

D$)$ Pointed Data Sources

$3.$ Graphical and numerical methods are specialized process utilized in

A$)$ Inferential Statistics

B$)$ Descriptive Statistics

C$)$ Business Statistics

D$)$ Social Statistics

$4.$ The following statistical measure is a useful for all data types, though mainly used for nominal data.

a$.$ Mean

b$.$ Median

c$.$ Mode

d$.$ Range

$5.$ The following statistical measure is calculated by placing all the observations in order; then selecting the observation that falls in the middle.

a$.$ Mean

b$.$ Median

c$.$ Mode

d$.$ Range

$6.$ The formula for the population variance is

a$.$

b$.$

c$.$

d$.$ Parts b and c are true.

$7.$ When referring to the number of observations in a population, we use

a$.$ uppercase letter N

b$.$ lower case letter n

c$.$ Greek letter $$mu$$

d$.$ an $$x$-$bar$$

$8.$ We refer to a unimodal distribution with a flat peak as

a$.$ leptokurtic

b$.$ misokurtic

c$.$ platykurtic

d$.$ Standard error

$9.$ Which of the following is a measure of dispersion or variation?

a$.$ Percentiles

b$.$ Quartiles

c$.$ interquartile range

d$.$ all of the above are measures of dispersion

$10.$ The most frequently occurring value of a data set is called the

a$.$ Range

b$.$ Mode

c$.$ Mean

d$.$ Median

$11.$ The measure most likely affected by extreme values or outliers is the:

a$.$ median

b$.$ mean

c$.$ mode

d$.$ inter$-$quartile range

e$.$ none of the above

$12.$ When each element in the population has an equal chance of being selected, the best way to describe this process would be:

a$.$ Systematic sampling

b$.$ Stratified sampling

c$.$ Two$-$way cluster sampling

d$.$ Simple random sampling

$13.$ Class ranking on a test is:

a$.$ nominal$/$categorical data

b$.$ ordinal data

c$.$ interval data

d$.$ ratio data

$14.$ For a unimodal positively skewed distribution the following relationship might be true

a$.$ Mean $=$ median $=$ mode

b$.$ Mean $<$ median $<=$ mode

c$.$ Mean $>$ median $>=$ mode

d$.$ None of the above

$15.$ Which of the following summary measures is most affected by outliers?

a$.$ the median

b$.$ the mean

c$.$ the range

d$.$ the interquartile range

$16.$ A class of $25$ students took a science test. $10$ students had an average $($arithmetic mean$)$ score of $80.$ The other students had an average score of $60.$ What is the overall average score of the whole class?

a$.70$

b$.60$

c$.72$

d$.68$

$17.$ Political party affiliation $($Labour$,$ Liberal etc.$)$ would be recorded as:

a$.$ nominal$/$categorical data

b$.$ ordinal data

c$.$ interval data

d$.$ ratio data

$18.$ The Empirical Rule states that the approximate percentage of measurements in a data set $($providing that the data set has a bell$-$shaped distribution$)$ that fall within one standard deviation of their mean is approximately:

a$.68\%$

b$.75\%$

c$.95\%$

d$.99\%$

$19.$ Which is a sampling technique that involves separating the population into non overlapping groups, and then selecting random samples from each group.

a$.$ systematic sampling

b$.$ stratified random

c$.$ cluster sampling

d$.$ simple random sampling

$20.$ Which of the following refers to numbers that indicate the spread or scatter of the observations in a data set?

a$.$ Measures of central tendency

b$.$ Measures of location

c$.$ Measures of variation

d$.$ Measures of skewness