QMB 3200 SIMPLIFIED REVISION QUESTIONS AND THEIR ANSWERS

QMB 3200 SIMPLIFIED REVISION
QUESTIONS AND THEIR ANSWERS
The standard deviation of a point estimator is the
standard error
Cluster sampling is
a probability sampling method
The interquartile range is the difference between the
first and third quartiles
A __________ can be used to graphically present quantitative
data.
both a histogram and a stem-and-leaf display are correct
The measure of variability easiest to compute, but seldom
used as the only measure, is the
Range
As the sample size increases, the variability among the sample
means
decreases
In a standard normal distribution, the range of values of z is
from
minus infinity to infinity

, The t value with a 95% confidence and 24 degrees of freedom
is
2.064
The number of customers that enter a store during one day is
an example of
a discrete random variable
Quantitative data that measure how many are ________;
quantitative data that measure how much are ________.
discrete; continuous
Exhibit 2-3
The number of sick days taken (per month) by 200 factory
workers is summarized below.


Number of Days
Frequency

0-5
120

6 - 10
65

11 - 15
14