The interquartile range is used as a measure of variability to overcome what difficulty of the range?
a. The sum of the range variances is zero.
b. The range is difficult to compute.
c. The range is influenced too much by extreme values.
d. The range is negative.
Question 2
A random sample of 144 observations has a mean of 20, a median of 21, and a mode of 22 . The population standard deviation is known to equal 4.8 . The 95.44 confidence interval for the population mean is
a. 15.2 to 24.8.
b. 19.20 to 20.80.
c. 19.216 to 20.784.
d. 21.2 to 22.8.
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