BUS6225 BUSINESS STATISTICS
EXAM PRACTICE QUESTIONS
A simple random sample assures that: - All items in a population have an equal
probability of selection.
Sampling is often preferred to surveying a population because: - All of the above are
reasons for sampling.
Which of the following is a method of probability sampling? - All of the above are
methods of probability sampling.
In a sample random sample: - Every item has the same chance to be in the sample.
Suppose a population consisted of 20 items. How many different sample of n = 3 are
possible - 1140
The difference between the sample mean and the population mean is called the: -
Sampling error
For the sampling distribution of sample means, what is the relationship between the
population mean and the mean of all possible sample means of size 25? - They are
equal.
When comparing the variances of a population distribution and a sampling distribution
of means from the population the: - Population variance is larger than the sampling
distribution variance.
The standard error of the mean is: - The standard deviation of the sampling distribution
of sample means.
A population distribution is normal with a mean of 18 and standard deviation of 4. A
sample of 16 observations is selected and a sample mean computed. What is the
probability that the sample mean is more than 18? - 0.5
A population distribution with a mean of 18 and standard deviation of 4. A sample of 16
observations is selected and a sample mean computed. What is the probability that the
sample mean is more than 20? - . 0228
When estimation population parameters, a point estimate is: - A statistic that estimates
a population parameter.
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