PYC3704 MAY/JUNE EXAM ANSWERS
QUESTIONS ASKED:
On what level of measurement is a person’s nationality (e.g., South African, Mexican, and Spanish)?
a.
Nominal
b.
Interval Measure
c.
Rank Order
Question 2
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,On what level of measurement is a person’s nationality (e.g., South African, Mexican, and Spanish)?
a.
Nominal
b.
Interval Measure
c.
Rank Order
Question 2
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Question text
Which one of the following alternative hypotheses would require a one-tailed test of significance?
a.
The mean anxiety score for boys differs from the mean score for girls.
b.
There is a significant correlation between English test marks and Mathematics marks for a mixed group of boys and girls.
c.
The mean verbal ability score for boys is lower than the mean verbal ability score for girls.
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We can never know for sure whether a Type I error has been made. Indicate whether the statement is either TRUE OR FALSE.
a.
True, because the ‘true’ values of population parameters are unknown.
,b.
True, because probability values are based on statistical tables, which are based on calculations that have their own errors affecting
their reliability.
c.
Not true, because Type I error is always made but ignored because it is not significant.
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You perform research to test the statistical hypothesis that H0: μ = 60 and H1: μ > 60. The mean obtained for the sample is x̄ = 50.
What is the CORRECT conclusion?
a.
Reject the alternative hypothesis.
b.
Perform another study to confirm the finding.
c.
A type I error is present.
Question 5
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Which error will we never know if it has been committed?
a.
Type I error
b.
Type II error
,c.
Both a Type I and a Type II error
Question 1: On what level of measurement is a person's nationality?
a. Nominal
Question 2: Which one of the following alternative hypotheses would require a one-tailed test of significance?
c. The mean verbal ability score for boys is lower than the mean verbal ability score for girls.
Question 3: We can never know for sure whether a Type I error has been made. Indicate whether the statement is either TRUE OR
FALSE.
b. True, because probability values are based on statistical tables, which are based on calculations that have their own errors affecting
their reliability.
Question 4: You perform research to test the statistical hypothesis that H0: μ = 60 and H1: μ > 60. The mean obtained for the sample
is x̄ = 50. What is the CORRECT conclusion?
a. Reject the alternative hypothesis.
Question 5: Which error will we never know if it has been committed?
a. Type I error
The Pearson’s r value - - - - -.
a.
is always a positive value
b.
ranges between -1 and +1
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