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WorksheetsProbability
Total questions: 35
Worksheet time: 12mins
Probability is used as a basis for inferential statistics.
True
False
When the population of college professors is divided into groups according to their rank (instructor, assistant professor, etc.) and then several are selected from each group to make up a sample, the sample is called a cluster sample.
True
False
Selecting a Sweater At a men’s clothing store, 12 men
purchased blue golf sweaters, 8 purchased green
sweaters, 4 purchased gray sweaters, and 7 bought black sweaters. If a customer is selected at random, find the probability that he purchased a blue sweater
a. 12/31
b. 27/31
c. 24/31
d. 1
It is the sequence of events in which the first one has m_1 possibilities, the second has m_2, the third has m_3, and so on. the possible outcomes will be: m_1∙m_2∙m_3∙…∙m_n
sample space
fundamental counting principle
event
The set of all possible outcomes of a probability experiment is called the _______________.
simple event
sample space
event
outcome
It is an event where one experiment happens at a time and it will be having a single outcome. It is also known as an elementary event.
compound event
simple event
event
sample space
Classify the given variable as discrete or continuous:
Ages of people working in a large factory
discrete
continuous
It is a type of probability that uses frequency distribution based on observations to determine numerical probabilities of events.
subjective probability
empirical probability
classical probability
probability
The group of all subjects under study is called a(n) (a) .
A group of subjects selected from the group of all subjects under study is called a(n) (a) .
When the population standard deviation is unknown and the sample size is less than 30, what table value should be used in computing a confidence interval for a mean?
z
t
Chi-square
None of the above
The statement "The average height of an adult male is 5 feet 10 inches" is an example of a(n) (a) estimate.
When two events are not mutually exclusive, P(A or B) = P(A) + P(B).
True
False
When objects are arranged in a specific order, the arrangement is called a combination.
True
False
The probability that an event happens is 0.42. What is the probability that the event won’t happen?
a. -0.42
b. 0.58
c. 0
d. 1
The complement of guessing 5 correct answers on a 5-question true/false exam is
a. Guessing 5 incorrect answers
b. Guessing at least 1 incorrect answer
c. Guessing at least 1 correct answer
d. Guessing no incorrect answers
The number of courses a student is taking this semester is an example of a continuous random variable.
True
False
When the binomial distribution is used, the outcomes must be dependent.
True
False
The standard normal distribution is a continuous distribution
True
False
All variables that are approximately normally distributed can be transformed to standard normal variables.
True
False
The z value corresponding to a number below the mean is always negative.
True
False
The area under the standard normal distribution to the left of z =0 is negative.
True
False
The central limit theorem applies to means of samples selected from different populations.
True
False
The mean of the standard normal distribution is
a. 0
b. 1
c. 100
d. Variable
Approximately what percentage of normally distributed data values will fall within 1 standard deviation above or below the mean?
a. 68%
b. 95%
c. 99.7%
d. Variable
Which is not a property of the standard normal distribution?
a. It’s symmetric about the mean.
b. It’s uniform.
c. It’s bell-shaped.
d. It’s unimodal.
When a distribution is positively skewed, the relationship of the mean, median, and mode from left to right will be
a. Mean, median, mode
b. Mode, median, mean
c. median, mode, mean
d. Mean, mode, median
The standard deviation of all possible sample means equals
a. The population standard deviation
b. The population standard deviation divided by the population mean
c. The population standard deviation divided by the square root of the sample size
d. The square root of the population standard deviation
When one is using the standard normal distribution, P(z < 0) = (a) .
The difference between a sample mean and a population mean is due to (a) .
The mean of the sample means equals (a) .
The standard deviation of all possible sample means is called (a) .
The correction factor for the central limit theorem should be used when the sample size is greater than (a) the size of the population.
Physics Test. A physics test consists of 25 true/false questions. How many different possible answer keys can be made?
(a)
Cellular Telephones How many different ways can 5 cellular telephones be selected from 8 cellular phones?
(a)
