EPPP Exam Questions and correct answers
In which type of graph do the bars touch to indicate the overlapping nature of the data?
a) bar graph
b) histogram
c) pie chart
d) scatterplot - histogram
Which scale of measurement is dichotomous/categorical and does not have a sp order, equal intervals or
an absolute zero?
a) nominal
b) ordinal
c) interval
d) ratio - nominal
Which scale of measurement would be used to measure the places achieved in a horse race?
a) nominal
b) ordinal
c) interval
d) ratio - ordinal
Which scale of measurement would be used to measure temperature?
a) nominal
b) ordinal
c) interval
d) ratio - interval-no absolute zero
Which scale of measurement would be used to measure reaction time in seconds?
a) nominal
b) ordinal
c) interval
,EPPP Exam Questions and correct answers
d) ratio - ratio
Which type of distribution is peaked?
a) platykurtic
b) kurtosis
c) leptokurtic - leptokurtic
In a positively skewed distribution, which has the largest value?
a) mean
b) median
c) mode - mean
In a negatively skewed distribution, which has the largest value?
a) mean
b) median
c) mode - mode
What should you use as a measure of central tendency when there are outliers?
a) mean
b) median
c) mode - median
What should you use as a measure of central tendency when there are no outliers?
a) mean
b) median
c) mode - mean-it is more precise
Which of these is not a prediction of the central limit theorem?
,EPPP Exam Questions and correct answers
a) as sample size increases, the sampling distribution of the mean approaches normal distribution
b) mean of the sample should equal the population mean
c) the median of the sample should equal the population median
d) SD of the sampling distribution should qual the population SD divided by the sq root of the sample
size - c) the median of the sample should equal the population median
What is the level of significance?
a) alpha
b) beta
c) 1-alpha
d) 1-beta - alpha
What refers to the tendency to incorrectly reject the null hypothesis?
a) Type I error
b) Type II error - Type I error
What error is made when the researcher accepts the null hypothesis but it is actually false?
a) Type I error
b) Type II error - Type II error
The probability of making a Type I error is:
a) alpha
b) beta
c) 1-alpha
d) 1-beta - alpha
The probability of making a Type II error is:
a) alpha
b) beta
, EPPP Exam Questions and correct answers
c) 1-alpha
d) 1-beta - beta
Increased power refers to the:
a) ability to correctly reject the false null hypothesis
b) ability to correctly accept the false null hypothesis - a) ability to correctly reject the false null
hypothesis
All of these increase statistical power except:
a) reducing alpha (.01 instead of .05)
b) large sample size
c) one-tailed test
d) controlling for extraneous variables - a) reducing alpha (.01 instead of .05)--power is increased by
increasing alpha (but this also increases the probability of making a Type I error); decreasing alpha gives
you more confidence but less power
Which of the post hoc analyses are vulnerable to a Type I error?
a) Scheefe
b) Tukey
c) Fishers - Fishers; the others are vulnerable to a Type II error
Which statistical test is suitable for using on nominal data?
a) chi-square
b) Mann-Whitney U
c) t-test
d) multiple regression - a) chi-square
Which statistical test is suitable for comparing the means of 2 groups?
a) ANOVA
b) ANCOVA
In which type of graph do the bars touch to indicate the overlapping nature of the data?
a) bar graph
b) histogram
c) pie chart
d) scatterplot - histogram
Which scale of measurement is dichotomous/categorical and does not have a sp order, equal intervals or
an absolute zero?
a) nominal
b) ordinal
c) interval
d) ratio - nominal
Which scale of measurement would be used to measure the places achieved in a horse race?
a) nominal
b) ordinal
c) interval
d) ratio - ordinal
Which scale of measurement would be used to measure temperature?
a) nominal
b) ordinal
c) interval
d) ratio - interval-no absolute zero
Which scale of measurement would be used to measure reaction time in seconds?
a) nominal
b) ordinal
c) interval
,EPPP Exam Questions and correct answers
d) ratio - ratio
Which type of distribution is peaked?
a) platykurtic
b) kurtosis
c) leptokurtic - leptokurtic
In a positively skewed distribution, which has the largest value?
a) mean
b) median
c) mode - mean
In a negatively skewed distribution, which has the largest value?
a) mean
b) median
c) mode - mode
What should you use as a measure of central tendency when there are outliers?
a) mean
b) median
c) mode - median
What should you use as a measure of central tendency when there are no outliers?
a) mean
b) median
c) mode - mean-it is more precise
Which of these is not a prediction of the central limit theorem?
,EPPP Exam Questions and correct answers
a) as sample size increases, the sampling distribution of the mean approaches normal distribution
b) mean of the sample should equal the population mean
c) the median of the sample should equal the population median
d) SD of the sampling distribution should qual the population SD divided by the sq root of the sample
size - c) the median of the sample should equal the population median
What is the level of significance?
a) alpha
b) beta
c) 1-alpha
d) 1-beta - alpha
What refers to the tendency to incorrectly reject the null hypothesis?
a) Type I error
b) Type II error - Type I error
What error is made when the researcher accepts the null hypothesis but it is actually false?
a) Type I error
b) Type II error - Type II error
The probability of making a Type I error is:
a) alpha
b) beta
c) 1-alpha
d) 1-beta - alpha
The probability of making a Type II error is:
a) alpha
b) beta
, EPPP Exam Questions and correct answers
c) 1-alpha
d) 1-beta - beta
Increased power refers to the:
a) ability to correctly reject the false null hypothesis
b) ability to correctly accept the false null hypothesis - a) ability to correctly reject the false null
hypothesis
All of these increase statistical power except:
a) reducing alpha (.01 instead of .05)
b) large sample size
c) one-tailed test
d) controlling for extraneous variables - a) reducing alpha (.01 instead of .05)--power is increased by
increasing alpha (but this also increases the probability of making a Type I error); decreasing alpha gives
you more confidence but less power
Which of the post hoc analyses are vulnerable to a Type I error?
a) Scheefe
b) Tukey
c) Fishers - Fishers; the others are vulnerable to a Type II error
Which statistical test is suitable for using on nominal data?
a) chi-square
b) Mann-Whitney U
c) t-test
d) multiple regression - a) chi-square
Which statistical test is suitable for comparing the means of 2 groups?
a) ANOVA
b) ANCOVA
