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Statistics Review Project - Iron Avila, Maynor Romero P.1 Flashcards | StudBud
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Statistics Review Project - Iron Avila, Maynor Romero P.1
Statistics Review Project - Iron Avila, Maynor Romero P.1
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1
What's a random variable?
A constant used to calculate probabilities
A variable that takes different values based on chance
A number that always results in the same outcome
A fixed value that doesn't change
2
In a frequency distribution, the class width is the distance between the lower and upper limits of a class
True
False
3
Data at the ratio level cannot be put in order
True
False
4
When you use the fundamental counting principle, what are you counting?
The ratio of favorable to total outcomes
The sum of all event probabilities
The total number of possible outcomes
The number of events in a sequence
5
"The probability of rain is 150%". Why is the statement incorrect?
Rain probability must always be 0%
Percentages aren't used in probability
Probability of rain is always exactly 50%
Probability can’t be more than 100%
6
A z score is 0. Which of these statements must be true?
The corresponding x-value is equal to the mean
The mean is 0
The mean is 1
The corresponding x-value is 0
7
What are three most commonly used measures of central tendency?
Mean, median, and mode
Mode, quartile, and percentile
Range, variance, and standard deviation
Mean, range, and frequency
8
What's a histogram?
A scatter plot for correlation analysis
A line graph comparing two variables
A pie chart used for percentages
A bar graph showing frequency of data
9
What are the two conditions that a discrete probability distribution must satisfy?
Outcomes even, probabilities odd
Probabilities greater than 1, outcomes continuous
Probabilities sum to 1, each between 0 and 1
Outcomes sum to 0, probabilities negative
10
What are the two major branches in the study of statistics?
Experimental and theoretical statistics
Mean and median analysis
Descriptive and inferential statistics
Linear and nonlinear statistics
11
How is the complement of an event related to the original event?
P(A and A') = 1
P(A or A') = 0
P(A') = 1 - P(A)
P(A') = P(A)
12
What's the total area under the normal curve?
0.5
1.5
1
2
13
Data at the ordinal level are quantitative only
False
True
14
In a normal distribution, which is greater, the mean or the median?
They are equal
Median
None of the two
Mean
15
What does the mean of a probability distribution represent?
The range of possible outcomes
The most likely outcome
The total sum of all probabilities
The expected value of the random variable
16
What's difference between qualitative data and quantitative data?
Qualitative use words, Quantitative involves numbers
Quantitative is based on opinions, qualitative on stats
Quantitative describes feelings, qualitative involves math
Qualitative uses charts, quantitative uses interviews
17
What's the difference between an outcome and an event?
Outcomes are rare, events are common
An outcome is a collection of events; an event is a single result
An outcome is always positive; an event is always negative
An outcome is a single result; an event is a collection of outcomes
18
As the sample size increases, the mean of the distribution of sample means increases
False
True
19
What's the difference between class limits and class boundaries?
Class limits are for graphs, and class boundaries are for tables
Class limits show averages, and class boundaries show ranges
Class limits are listed values; Class boundaries fill gaps between classes
Class limits are estimates; Class boundaries are exact values
20
The expected value of a random value can never be negative
False
True
