The total area under a probability curve is always
Aequal to unity
Bgreater than one
Cbetween zero and one
Dless than one
Mathematics · Question Bank
Statistics
80 questions · page 4 of 4. Answer in your head first, then check the solution.
The range is a measure of
Avariability
Bdeviation
Ccentral tendency
Ddistribution
It is a measure of dispersion which depends upon the deviation of all scores from the mean.
Aaverage deviation
Bquartile deviation
Cmean deviation
Dstandard deviation
Which of the following is not a continuous variable?
Aweight of a body
Bheight of a body
Ctemperature of an object
Dnumber of girls
It represents that point in the data where one half of the scores fall below that point and one half falls above it.
Aaverage
Bmedian
Cmidscore
Dmean
Which of the following events are mutually exclusive?
Aevents “ace or black card”
Bevents “king or red card”
Cevents “queen or face card”
Devents “diamond or black Jack”
In probability theory, what do you call the set of all possible outcomes of an experiment?
Aevent
Btrial
Csample space
Dvariate
If A and B are two events and p(A and B) = p(A)p(B), then the two events are said to be
Acomplementary
Bindependent
Cdisjoint
Ddependent
The highest score in a distribution minus the lowest score is called the
Aclass mark
Bmedian
Crange
Dstandard score
It refers to the number of times a score occurs in a sample.
Aoutcome
Bmode
Caverage
Dfrequency
It refers to the facts and figures collected on some characteristics of a sample.
Aarray
Bdata
Cpopulation
Dhistogram
In set theory, the sum A + B is denoted by
AA ᴗ B
BA ᴖ B
CA = B
DA ↔ B
The most widely used measure of dispersion is the
Amean deviation
Bstandard deviation
Cquartile deviation
Daverage deviation
The number of favorable outcomes divided by the total amount of outcomes is called
Apermutation
Bcertainty
Cprobability
Dfrequency
The sum of the squared deviation about the mean is called
Avariate
Bvariable
Cvariance
Dvalue
In statistics, which of the following is a qualitative variable?
Anumber grade in a card
Bletter grade in a card
Cnumber of people
Dsalary of a teacher
The positive square root of the variance is equal to
Aquartile deviation
Bmean deviation
Cstandard deviation
Daverage deviation
It is equal to the absolute difference between the observations in a sample and the mean divided by the total number of observations in the sample.
Aarithmetic mean
Broot mean square
Cquartile deviation
Dmean deviation
When the sample is large and the variable is quantitative which of the following measures of central tendency has a distinct advantage in terms of accuracy?
Ageometric mean
Barithmetic mean
Cmedian
Dmode
Which of the following events are mutually exclusive?
Aevent “Ace” and event “black card”
Bevent “Queen” and event “heart”
Cevent “Ten” and event “Spade”
Devent “diamond” and event “club”