PYC3704 - SET 6 QUESTIONS AND ANSWERS
Suppose a test statistic is calculated, and based on this the p-value is determined
to be 0.03. Which of the following decisions should the researcher make‘?
Reject H0 if the level of significance was set in advance at 0.05
A researcher in educational psychology wants to investigate the possibility that
primary school children who regularly watch educational programmes on
television get better general grades in primary school than those who do not. She
draws a random sample of 100 children from a specific primary school and after
investigation of their histories of television watching, allocates them into two
groups, a TV-Group of 45 children with a history of watching educational
programmes and a Non-TV Group of 55 children with no such history. At the end
of the school year, she compares the final year marks of the two groups
Considering the scenario above, which of the following statements are true? (a)
The two groups are dependent because they come from the same school (b)
Watching television is the dependant variable and year mark is the independent
variable (c) A one-tailed test would be required
(a)The two groups are dependent because they come from the same school and (c)A
one-tailed test would be required
A researcher in educational psychology wants to investigate the possibility that
primary school children who regularly watch educational programmes on
television get better general grades in primary school than those who do not. She
draws a random sample of 100 children from a specific primary school and after
investigation of their histories of television watching, allocates them into two
groups, a TV-Group of 45 children with a history of watching educational
programmes and a Non-TV Group of 55 children with no such history. At the end
of the school year, she compares the final year marks of the two groups
Which of the following is an appropriate description of the research population in
the scenario?
Primary school children
A researcher in educational psychology wants to investigate the possibility that
primary school children who regularly watch educational programmes on
television get better general grades in primary school than those who do not. She
draws a random sample of 100 children from a specific primary school and after
investigation of their histories of television watching, allocates them into two
groups, a TV-Group of 45 children with a history of watching educational
programmes and a Non-TV Group of 55 children with no such history. At the end
of the school year, she compares the final year marks of the two groups
When comparing the year marks of the two groups of children (using ‘TV’ and
‘NoTV’ to indicate the group that watches educational TV and the one that does
not watch it, respectively) which is of the options below are the most appropriate
way to express the formal A one-tailed test would be required suggested by this
scenario?
μTV > μNoTV
, A psychotherapist wants to test the effectiveness of a programme of cognitive
behavioural therapy on clients who were diagnosed as suffering from high social
anxiety. She uses a sample of 50 persons who were diagnosed as persons with
high anxiety and tests them on a Social Anxiety Scale before the commencement
of the series of therapy sessions, and again afterwards. The two sets of
measurements should be regarded as
dependent
Two samples can be considered independent when ______
there is no systematic matching of individuals of one sample with individuals from the
other one
A researcher wants to test the hypothesis that girls are generally
less assertive than boys. He draws a sample of 100 boys and a sample of 100
girls, and gives each child a test that measures their general level of
assertiveness. Which would be the most appropriate statistical test to use, out of
the following?
The t-test for independent samples
The difference score (đ = x2 - x1) is used in the calculation of the t-test statistic in
the case of ______ (a) dependent samples (b) independent samples (c) random
samples
only (a)dependent samples
Which of the following statements about the relationship between the value of a t-
test statistic and the p-value is true, if the sample size (n) remains constant?
The larger the value of the t-test statistic, the smaller p will be
Which of the following gives the best description of a null hypothesis? The null
hypothesis is the hypothesis that ______
states that there is no relationship between the variables
In correlational research one investigates the relation between ______
two variables measured on the same group of subjects
A researcher hypothesizes that the greater the number of books read by pupils
over a specific school year, the greater their language comprehension will be at
the end of that year. He studies a random sample of 100 pupils in grades 10 — 12
in a specific school, collecting information on the number of books they read in a
specific year and letting them do a reading comprehension test at the end of the
year Which is an appropriate formal expression of the alternative hypothesis for
this research?
ρ>0
Which of the following can never be exactly zero?
a level of significance
A graph showing the position of each of a number of measurements on each of
two variables is called a
scatter plot
For a larger sample size (n) ______
the size of Pearson's correlation coefficient r is likely to move closer to zero
A Pearson correlation of r = -0.71 is found when the linear correlation between
two variables is calculated. What kind of relationship between two variables X
and Y does this represent?
Suppose a test statistic is calculated, and based on this the p-value is determined
to be 0.03. Which of the following decisions should the researcher make‘?
Reject H0 if the level of significance was set in advance at 0.05
A researcher in educational psychology wants to investigate the possibility that
primary school children who regularly watch educational programmes on
television get better general grades in primary school than those who do not. She
draws a random sample of 100 children from a specific primary school and after
investigation of their histories of television watching, allocates them into two
groups, a TV-Group of 45 children with a history of watching educational
programmes and a Non-TV Group of 55 children with no such history. At the end
of the school year, she compares the final year marks of the two groups
Considering the scenario above, which of the following statements are true? (a)
The two groups are dependent because they come from the same school (b)
Watching television is the dependant variable and year mark is the independent
variable (c) A one-tailed test would be required
(a)The two groups are dependent because they come from the same school and (c)A
one-tailed test would be required
A researcher in educational psychology wants to investigate the possibility that
primary school children who regularly watch educational programmes on
television get better general grades in primary school than those who do not. She
draws a random sample of 100 children from a specific primary school and after
investigation of their histories of television watching, allocates them into two
groups, a TV-Group of 45 children with a history of watching educational
programmes and a Non-TV Group of 55 children with no such history. At the end
of the school year, she compares the final year marks of the two groups
Which of the following is an appropriate description of the research population in
the scenario?
Primary school children
A researcher in educational psychology wants to investigate the possibility that
primary school children who regularly watch educational programmes on
television get better general grades in primary school than those who do not. She
draws a random sample of 100 children from a specific primary school and after
investigation of their histories of television watching, allocates them into two
groups, a TV-Group of 45 children with a history of watching educational
programmes and a Non-TV Group of 55 children with no such history. At the end
of the school year, she compares the final year marks of the two groups
When comparing the year marks of the two groups of children (using ‘TV’ and
‘NoTV’ to indicate the group that watches educational TV and the one that does
not watch it, respectively) which is of the options below are the most appropriate
way to express the formal A one-tailed test would be required suggested by this
scenario?
μTV > μNoTV
, A psychotherapist wants to test the effectiveness of a programme of cognitive
behavioural therapy on clients who were diagnosed as suffering from high social
anxiety. She uses a sample of 50 persons who were diagnosed as persons with
high anxiety and tests them on a Social Anxiety Scale before the commencement
of the series of therapy sessions, and again afterwards. The two sets of
measurements should be regarded as
dependent
Two samples can be considered independent when ______
there is no systematic matching of individuals of one sample with individuals from the
other one
A researcher wants to test the hypothesis that girls are generally
less assertive than boys. He draws a sample of 100 boys and a sample of 100
girls, and gives each child a test that measures their general level of
assertiveness. Which would be the most appropriate statistical test to use, out of
the following?
The t-test for independent samples
The difference score (đ = x2 - x1) is used in the calculation of the t-test statistic in
the case of ______ (a) dependent samples (b) independent samples (c) random
samples
only (a)dependent samples
Which of the following statements about the relationship between the value of a t-
test statistic and the p-value is true, if the sample size (n) remains constant?
The larger the value of the t-test statistic, the smaller p will be
Which of the following gives the best description of a null hypothesis? The null
hypothesis is the hypothesis that ______
states that there is no relationship between the variables
In correlational research one investigates the relation between ______
two variables measured on the same group of subjects
A researcher hypothesizes that the greater the number of books read by pupils
over a specific school year, the greater their language comprehension will be at
the end of that year. He studies a random sample of 100 pupils in grades 10 — 12
in a specific school, collecting information on the number of books they read in a
specific year and letting them do a reading comprehension test at the end of the
year Which is an appropriate formal expression of the alternative hypothesis for
this research?
ρ>0
Which of the following can never be exactly zero?
a level of significance
A graph showing the position of each of a number of measurements on each of
two variables is called a
scatter plot
For a larger sample size (n) ______
the size of Pearson's correlation coefficient r is likely to move closer to zero
A Pearson correlation of r = -0.71 is found when the linear correlation between
two variables is calculated. What kind of relationship between two variables X
and Y does this represent?
