ELEMENTARY STATISTICS EXAM 2
COMPREHENSIVE REVIEW SHEET
VERIFIED QUESTION BANK
●● 34% + 34% = 68%
Answer: The mean score on a creativity test is 20 and the standard
deviation is 5. The distribution is normal. Using the percentage
approximations for the normal curve, how many people would attain a
score between 15 and 25?
●● 150/500 = .3
Answer: In a housing project there are 350 households in which English
is usually spoken, 50 in which Spanish is usually spoken, and 100 in
which the language is other than English or Spanish. A researcher
approaches a house at random to conduct an interview. What is the
chance that the usual language in that household will NOT be English?
●● can't be lower than zero or more than one
Answer: The fact that probabilities are proportions means that they:
●● multiply by 100
Answer: To change a proportion into a percent:
,●● sample
Answer: You have an aquarium full of tropical salt-water fish and you
need to know the exact salt content of the water. To test it, you take a
cup and scoop some of the water out. In statistical language, the scoop of
water is a:
●● All the workers in the factory
Answer: A researcher conducts extensive interviews with 40 workers at
a large factory in order to examine the morale among workers in general
at that factory. In this example, what is the population?
●● random selection
Answer: ⦁ You want to study the general amount of drug use at your
university. You obtain a complete list of students. You then put all the
names into a box and have a blindfolded person select as many people as
you needed. This is called:
●● entire population
Answer: If you want to know something about a population, your results
would be MOST accurate if you could study the:
●● Unimodal, roughly symmetrical, and bell-shaped
Answer: If you were looking at a graph of a normal distribution, which
of the following would best describe it?
, ●● central limit theorem
Answer: 2. The _____________ explains why many distributions tend to
be close to normal in the real world.
●● 34% + 34% = 68%
Answer: The mean score on a creativity test is 20 and the standard
deviation is 5. The distribution is normal. Using the percentage
approximations for the normal curve, how many people would attain a
score between 15 and 25?
●● 34%
Answer: Using the percentage approximations for the normal curve,
what percentage of scores are between the mean and one standard
deviation below the mean?
●● the number of times something occurs relative to the number of
times it could have occurred
Answer: Relative frequency is:
●● 2/12 = .17
Answer: You randomly select someone from a group of 12. Two of those
in the group were born in Iowa. What is the chance you will pick a
person born in Iowa?
COMPREHENSIVE REVIEW SHEET
VERIFIED QUESTION BANK
●● 34% + 34% = 68%
Answer: The mean score on a creativity test is 20 and the standard
deviation is 5. The distribution is normal. Using the percentage
approximations for the normal curve, how many people would attain a
score between 15 and 25?
●● 150/500 = .3
Answer: In a housing project there are 350 households in which English
is usually spoken, 50 in which Spanish is usually spoken, and 100 in
which the language is other than English or Spanish. A researcher
approaches a house at random to conduct an interview. What is the
chance that the usual language in that household will NOT be English?
●● can't be lower than zero or more than one
Answer: The fact that probabilities are proportions means that they:
●● multiply by 100
Answer: To change a proportion into a percent:
,●● sample
Answer: You have an aquarium full of tropical salt-water fish and you
need to know the exact salt content of the water. To test it, you take a
cup and scoop some of the water out. In statistical language, the scoop of
water is a:
●● All the workers in the factory
Answer: A researcher conducts extensive interviews with 40 workers at
a large factory in order to examine the morale among workers in general
at that factory. In this example, what is the population?
●● random selection
Answer: ⦁ You want to study the general amount of drug use at your
university. You obtain a complete list of students. You then put all the
names into a box and have a blindfolded person select as many people as
you needed. This is called:
●● entire population
Answer: If you want to know something about a population, your results
would be MOST accurate if you could study the:
●● Unimodal, roughly symmetrical, and bell-shaped
Answer: If you were looking at a graph of a normal distribution, which
of the following would best describe it?
, ●● central limit theorem
Answer: 2. The _____________ explains why many distributions tend to
be close to normal in the real world.
●● 34% + 34% = 68%
Answer: The mean score on a creativity test is 20 and the standard
deviation is 5. The distribution is normal. Using the percentage
approximations for the normal curve, how many people would attain a
score between 15 and 25?
●● 34%
Answer: Using the percentage approximations for the normal curve,
what percentage of scores are between the mean and one standard
deviation below the mean?
●● the number of times something occurs relative to the number of
times it could have occurred
Answer: Relative frequency is:
●● 2/12 = .17
Answer: You randomly select someone from a group of 12. Two of those
in the group were born in Iowa. What is the chance you will pick a
person born in Iowa?
