The measure of location which is the most likely to be influenced by extreme values in
the data set is the
range
median
mode
mean
If two events are independent, then
they must be mutually exclusive
the sum of their probabilities must be equal to one
their intersection must be zero
None of these alternatives is correct.
Two events, A and B, are mutually exclusive and each have a nonzero probability. If
event A is known to occur, the probability of the occurrence of event B is
one
any positive value
zero
any value between 0 to 1
A numerical description of the outcome of an experiment is called a
descriptive statistic
probability function
variance
random variable
In the textile industry, a manufacturer is interested in the number of blemishes or flaws
occurring in each 100 feet of material. The probability distribution that has the greatest
chance of applying to this situation is the
normal distribution
binomial distribution
Poisson distribution
uniform distribution
Which of the following is not a property of a binomial experiment?
the experiment consists of a sequence of n identical trials
each outcome can be referred to as a success or a failure
the probabilities of the two outcomes can change from one trial to the next
the trials are independent
The level of significance is the
maximum allowable probability of Type II error
maximum allowable probability of Type I error
same as the confidence coefficient
same as the p-value
An important application of the chi-square distribution is
making inferences about a single population variance
testing for goodness of fit
testing for the independence of two variables
All of these alternatives are correct.
For a continuous random variable x, the probability density function f(x) represents
the probability at a given value of x
the area under the curve at x
the area under the curve to the right of x
the height of the function at x
Convenience sampling is an example of
probabilistic sampling
stratified sampling
nonprobabilistic sampling
cluster sampling
In hypothesis testing, the hypothesis tentatively assumed to be true is
the alternative hypothesis
the null hypothesis
either the null or the alternative
None of these alternatives is correct.
In point estimation
data from the population is used to estimate the population parameter
data from the sample is used to estimate the population parameter
data from the sample is used to estimate the sample statistic
the mean of the population equals the mean of the sample
A variable that takes on the values of 0 or 1 and is used to incorporate the effect of
qualitative variables in a regression model is called
an interaction
a constant variable
a dummy variable
None of these alternatives is correct.
A property of a point estimator that occurs whenever larger sample sizes tend to provide
point estimates closer to the population parameter is known as
efficiency
unbiased sampling
consistency
relative estimation
If a hypothesis is rejected at the 5% level of significance, it
will always be rejected at the 1% level
will always be accepted at the 1% level
will never be tested at the 1% level
may be rejected or not rejected at the 1% level
Which of the following does not need to be known in order to compute the p-value?
knowledge of whether the test is one-tailed or two-tailed
the value of the test statistic
the level of significance
None of these alternatives is correct.
The ANOVA procedure is a statistical approach for determining whether or not
the means of two samples are equal
the means of two or more samples are equal
the means of more than two samples are equal
the means of two or more populations are equal
The range of the Durbin-Watson statistic is between
− 1 to 1
0 to 1
− infinity to + infinity
0 to 4
A random sample of 121 bottles of cologne showed an average content of 4 ounces. It is
known that the standard deviation of the contents (i.e., of the population) is 0.22 ounces.
In this problem the 0.22 is
a parameter
a statistic
the standard error of the mean
the average content of colognes in the long run
Whenever using the t distribution in estimation, we must assume that
the sample size is at least 30
the sampling distribution is approximately normal
the population is approximately normal
the finite population correction factor is necessary
In a random sample of UTC students 50% indicated they are business majors, 40%
engineering majors, and 10% other majors. Of the business majors, 60% were females;
whereas, 30% of engineering majors were females. Finally, 80% of the other majors
were male. Given that a person is male, what is the probability that he is an engineering
major?
The life expectancy of Timely brand watches is normally distributed with a mean of
four years and a standard deviation of eight months. Ninety-five percent of the watches
will have a life expectancy of at least how many months?
Economists have stated that the marginal propensity to consume is at least 90% out of
every dollar. Identify the null and alternative hypotheses
An ANOVA procedure is applied to data obtained from 6 samples where each sample
contains 20 observations. The degrees of freedom for the critical value of F are ____
numerator and ____ denominator degrees of freedom
Find the sufficient statistic of θ
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