STT 231 PRACTICE EXAM WITH
CORRECT ANSWERS
Another researcher plans to choose 64 hospitals at random from the list of all hospitals,
and to use the mean number of patients discharged of these 64 hospitals as an
estimate of the mean number of patients discharged from the population. What features
of the sampling distribution for this researcher's estimator would you expect to be similar
to the sampling distribution based on 32 hospitals? What features would you expect to
be different? - Answer- we should expect the standard deviation of the sampling
distribution (standard error) to be smaller at larger sample sizes, so the sampling
distribution of means computed for sample size n=64 should display less variability than
the sampling distribution of means computed for sample size n=32. the shape and
central tendency of these distributions should not differ
Suppose that every student in our class scored 5 points higher on the second exam
than on the first exam. What would be the value of the correlation coefficient, r, between
the first exam and second exam scores? - Answer- 1.0
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
Is the mid-range a measure of center or a measure of variability? - Answer- center
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
Is the mid-range resistant to outliers? - Answer- No
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
Is the mid-hinge a measure of center or a measure of variability? - Answer- center
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
CORRECT ANSWERS
Another researcher plans to choose 64 hospitals at random from the list of all hospitals,
and to use the mean number of patients discharged of these 64 hospitals as an
estimate of the mean number of patients discharged from the population. What features
of the sampling distribution for this researcher's estimator would you expect to be similar
to the sampling distribution based on 32 hospitals? What features would you expect to
be different? - Answer- we should expect the standard deviation of the sampling
distribution (standard error) to be smaller at larger sample sizes, so the sampling
distribution of means computed for sample size n=64 should display less variability than
the sampling distribution of means computed for sample size n=32. the shape and
central tendency of these distributions should not differ
Suppose that every student in our class scored 5 points higher on the second exam
than on the first exam. What would be the value of the correlation coefficient, r, between
the first exam and second exam scores? - Answer- 1.0
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
Is the mid-range a measure of center or a measure of variability? - Answer- center
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
Is the mid-range resistant to outliers? - Answer- No
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
Is the mid-hinge a measure of center or a measure of variability? - Answer- center
Consider two new statistics that we have not yet studied:
mid-range = (minimum + maximum) / 2
mid-hinge = (first quartile + third quartile) / 2
