Stat Chapter 4 Test Questions with Revised Answers
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Course
Stat
Institution
Stat
Stat Chapter 4 Test Questions with Revised Answers
The _______ for a procedure consists of all possible simple events or all outcomes that cannot be broken down any further. - Answer-The
sample space
for a procedure consists of all possible simple events or all outcomes that cannot be broken...
Stat Chapter 4 Test Questions with
Revised Answers
The _______ for a procedure consists of all possible simple events or all outcomes that
cannot be broken down any further. - Answer-The
sample space
for a procedure consists of all possible simple events or all outcomes that cannot be
broken down any further.
As a procedure is repeated again and again, the relative frequency of an event tends to
approach the actual probability. This is known as _______. - Answer-As a procedure is
repeated again and again, the relative frequency of an event tends to approach the
actual probability. This is known as
the law of large numbers.
When randomly selecting an adult, A denotes the event of selecting someone with blue
eyes. What do Upper P left parenthesis Upper A right parenthesis and Upper P left
parenthesis Upper A overbar right parenthesis represent? - Answer-Upper P left
parenthesis Upper A right parenthesis represents the
probability of selecting an adult with blue eyes.
Upper P left parenthesis Upper A overbar right parenthesis represents the
probability of selecting an adult who does not have blue eyes.
When randomly selecting an adult, let B represent the event of randomly selecting
someone with type B blood. Write a sentence describing what the rule of complements
below is telling us.
Upper P left parenthesis Upper B or Upper B overbar right parenthesisequals1 -
Answer-It is certain that the selected adult has type B blood or does not have type B
blood.
A research center poll showed that 77% of people believe that it is morally wrong to not
report all income on tax returns. What is the probability that someone does not have this
belief? - Answer-1-.77 =.23
Find the indicated complement.
A certain group of women has a 0.79% rate of red/green color blindness. If a woman is
randomly selected, what is the probability that she does not have red/green color
blindness? - Answer-1-.0079 = .9921
If A denotes some event, what does Upper A overbar denote? If P(A)equals0.008, what
is the value of P(Upper A overbar)? - Answer-Event Upper A overbar denotes the
, complement of event A, meaning that Upper A overbar consists of all outcomes in which
event A does not occur.
A weather forecasting website indicated that there was a 45% chance of rain in a
certain region. Based on that report, which of the following is the most reasonable
interpretation? - Answer-There is a 0.45 probability that it will rain somewhere in the
region at some point during the day.
Assume that 1800 births are randomly selected and 899 of the births are girls. Use
subjective judgment to describe the number of girls as significantly high, significantly
low, or neither significantly low nor significantly high. - Answer-The number of girls is
neither significantly low nor significantly high.
A study on the enhancing effect of coffee on long-term memory found that 35
participants given 200 mg of caffeine performed better on a memory test 24 hours later
compared to the placebo group that received no caffeine.
a. There was a probability of 0.049 that the difference between the coffee group and the
placebo group was due to chance. What do you conclude?
b. A group given a higher dose of 300 mg performed better than the 200 mg group, with
a probability of 0.75 that this difference is due to chance. What do you conclude? -
Answer-a. The probability shows that the sample results
could not
have easily occurred by chance. It appears that there
is
sufficient evidence to conclude that 200 mg of caffeine does have an effect on memory.
b. The probability shows that the sample results
could
have easily occurred by chance. It appears that there
is not
sufficient evidence to conclude that the effects from the 300 mg treatment and the 200
mg treatment are different.
Which of the following is NOT a principle of probability? - Answer-All events are equally
likely in any probability procedure.
A study of 420,095 cell phone users resulted in 135 who developed cancer of the brain
or nervous system. When comparing this sample group to another group of people who
did not use cell phones, it was found that there is a probability of 0.512 of getting such
sample results by chance. What do you conclude? - Answer-The probability shows that
the sample results
could
have easily occurred by chance. It appears that there
is not
sufficient evidence to conclude that cell phones have an effect on cancer of the brain or
nervous system.
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