If the interquartile range is zero, you can conclude that:
(1) the range must also be zero
(2) the mean is also zero
(3) at least 50% of the observations have the same value
(4) all of the observations have the same value
(5) none of the above is correct
A sample of 100 IQ scores produced the following statistics:
mean = 95 lower quartile = 70
median = 100 upper quartile = 120
mode = 75 standard deviation = 30
Which statement(s) is (are) correct?
(1) Half of the scores are less than 95.
(2) The middle 50% of scores are between 100 and 120.
(3) One-quarter of the scores are greater than 120.
(4) The most common score is 95.