A random sample is defined as
a.a sample obtained in such a way that each possible sample of fixed size
n has an unequal probability of being selected.
b.a sample obtained in such a way that each possible sample of fixed size
n has an equal probability of being selected.
c.a sample obtained in such a way that each possible sample of varying sizes of
n has an unequal probability of being selected.
d.a sample obtained in such a way that each possible sample of varying sizes of
n has an equal probability of being selected.
Q. 2
Which of the following is not true of a sampling distribution of a sample statistic?
a.The standard deviation of the sample means will be the same as the population standard deviation.
b.The distribution of the values for the sample statistic was obtained from repeated samples.
c.All samples in the distribution are of the same size.
d.All samples in the distribution are drawn from the same population.
Q. 3
Given that a college student studies an average of 12 hours per week with a standard deviation of 4.1, what is the probability that a student studies less than 5 hours per week?
a.
b.
c.
d.
Q. 4
All ________ distributions have the same general probability function and distribution.
a.normal
b.continuous
c.discrete
d.probability
Q. 5 What is the value for the
z-score for a normal population with
?
a.The value of
and
must be known.
b.0.50
c.1
d.0
Q. 6 From the following probability plot, what can you say about the distribution of the data?
a.The distribution represents a straight line.
b.The distribution is not normal.
c.The distribution cannot be determined from the information given.
d.The distribution is approximately normal.
Q. 7
What is a given normal distribution is symmetric around?
a.zero
b.one
c.the standard deviation
d.the mean
Q. 8
What is the area under the standard normal curve between z = 0 and z = 1.96?
a.0.475
b.0.68
c.0.95
d.0.50
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