T-TEST

Question 1

Developed t-Test around 1905, for dealing with small

samples in brewing quality control.

Answer 1

William S. Gossett

Question 2

What type of t-test compares the
mean of a single
sample to known
population mean

Answer 2

ONE SAMPLE

Question 3

what type of t-test, whether the
population mean
is different from a
constant

Answer 3

ONE SAMPLE

Question 4

what type of t-test compares the
mean scores of
two different
groups of 
subjects

Answer 4

INDEPENDENT

SAMPLE

Question 5

test whether the 
population mean or 
differences between 
paired scores is 
equal to zero

Answer 5

INDEPENDENT

SAMPLE

Question 6

test that compares the 
mean scores for 
the same group of 
subjects on two 
different occasions

Answer 6

PAIRED SAMPLE

Question 7

test the relationship
between two
categories and a
quantitative variable

Answer 7

PAIRED SAMPLE

Question 8

Assumption of ______________is common requirement in all the
types of t-tests shown above.

In which, the data set must be, or even approximately,
normally distributed.

Answer 8

normality

Question 9

If variances are equal: _______t-test for

independent samples

Answer 9

Classical students’

Question 10

If variances are not equal: _________ Test.

Answer 10

Welch

Question 11

This test is more practical and realistic because population
parameters are not usually known or calculated, that’s why
there are only assumptions.

Answer 11

ONE SAMPLE T-TEST

Question 12

o The value of the population standard
deviation is not known.
o The population is normally distributed and/or
the sample size is large (n > 30).

Answer 12

ONE SAMPLE T-TEST

Question 13

• Both samples are simple random samples.
• The two samples are independent.
• σ1 an σ2 are unknown and assumption is made about
the equality of σ1 and σ2.

Answer 13

INDEPENDENT SAMPLES T-TEST

Question 14

Either or both of these conditions are satisfied: The two
sample sizes are both large (with n1 > 30 and n2 > 30)
and/or both samples come from populations having
normal distribution.

Answer 14

INDEPENDENT SAMPLES T-TEST

Question 15

If a sample is normally distributed, it must satisfy the

normality check; hence, the result must be ______.

Answer 15

not

significant

Question 16

if the sample values selected from one population are
not related to or somehow paired or matched with the
sample values from the other population.

Answer 16

Independent Samples

Question 17

if the sample values are paired (e.g. two measurements
from the same subject or matched pairs, where the
matching is based on some inherent relationship.)

Answer 17

Dependent Samples

Question 18

Requirements:
• The samples are simple random samples.
• The sample data are dependent.

Answer 18

PAIRED SAMPLES T-TEST

Question 19

The number of pairs of sample data is large (n > 30) and/or
the pairs of values have differences that are from a
population having a normal distribution

Answer 19

PAIRED SAMPLES T-TEST