Stat Tri 2 multiple choice and fill ins
If an event can occur, its probability is ______.
0
p50 corresponds to A) Q2 B) d4 C) IQR D) Midrange
Q2
What is nCn? A) 0 B) 1 C) n D) cannot be determined
0
The probability of an event can be any number between and including ____ and _____.
0 and 1
In a probability distribution, the sum of all events in the sample space must equal ________.
1
What is 0!? A) 0 B) 1 C) undefined D) 10
1
What is np0? A) 0 B) 1 C) n D) cannot be determined
1
How many outcomes are there in a binomial distribution? A) 0 B) 1 C) 2 D) it varies
2
When 2 dice are rolled, the sample space consists of how many events? A) 6 B) 12 C) 36 D) 54
36
When a distribution is bell shaped, approximately what percentage of data values will fall within 1 standard deviation of the mean? A) 50% B) 68% C) 95% D) 99.7%
68
Random variables are determined by _______.
Chance
The arrangement ABC is the same as BAC for combination. t or f
F
A discrete random variable in a probability distribution: A) is counted B) is measured C) must be an even number D) can't be a fraction
Its counted
Which is not part of the five point summary? A) q1 and q3 B) Mean C) Median D) The smallest and largest values
Mean
When you add the lowest data value to the highest data value and divide by two the measure is called _______.
Midrange
When data is categorized as, for example, places of residence (rural, suburban, urban) the most appropriate measure for central tendency is the A) Mean B) Mode C) Median D) Midrange
Mode
When two events cannon occur at the same time, they are said to be ______ ______.
Mutually exclusive
What is the value of the mode when all the values in the data set are different? A) 0 B) 1 C) No Mode D) Can't be determined
No mode
The mean for a binomial distribution can be found by using the formula ______.
NxP
An extremely high or extremely low data value is called a(n) _________.
Outlier
The set of all possible outcomes of a probability experiment is called the ______ ______.
Sample space
The variance in a probability distribution is found by ________ the standard deviation.
Squaring
The positive square root of the variance is called the ________.
Standard Deviation
σ is the symbol for A) The variance B) The standard deviation C) the mean D) none of these
Standard deviation
A statistic that tells the number of standard deviations a data value is above or below the mean is called? A) quartile B) percentile C) Coefficient of variation D) Z score
Z score
AN event and its compliment can occur at the same time. t or f
f
If a persons score on an exam corresponds to 75th percentile, then that person obtained 75 correct answers out of a 100. T or f
f
If two events are spending, they must have the same probability of occurring t or f
f
In a binomial distribution, the mean is calculated by adding the probalitiles together are dividing by the number of trials. t or f
f
One half of all data values fall below the mode and one half of all data values will fall above the mode. T or f
f
The mode and midrange are both measures of variation. T or F
f
The number of games won by a football in a season is an example of a continuous random variable. t or f
f
When objects are arranged in a specific order, the arrangement is called a combination. t or f
f
Expected value is an indication that a game is A) Popular B) for kids C) fair D) ready for Las Vegas
fair
A binomial experiment has a fixed number of trials. t or f
t
The expected value of a random variable can be thought of as a long-run-average. t or f
t
The mean cannot be found for grouped data when there is an open class. t or f
t
When two events are mutually exclusive, P(A or B)= P(A)+P(B) t or f
t
The number of trials in a binomial distribution? A) Infinte B) Unchanged C) Unlimited D) Fixed
unlimited
