Quiz
For a sample to be random it must be obtained in such a way that each possible same of the same size has an equal probability of being selected from the population.
Characteristics of random samples drawn from a given population will vary from sample to sample.
The results obtained from large random samples tend to vary less than those from smaller samples.
All of the above
A and b
Always
Never
Only when working from the frequency distribution
More information is needed
True
False

The mean is sensitive to the presence or absence of extreme scores
The mean is responsive to the exact position of each score in the distribution
The mean may be thought of as the balance point of the distribution
All of the above
A and c
Ogive
Frequency polygon
Frequency curve
All
A and c
The standard deviation
Interquartile range
The semi interquartile range
Range
More info needed
True
False

Ordinal
Nominal
Ratio
Interval
None
Range
Variance
Standard deviation
Absolute devation
None
Sample,population
Population,sample
Frequency distribition, sample
Population,frequency distribution
Percentile rank
Range
Projectile
All
None
The relative positioning of the quartiles
The relative positioning of the measures of central tendency
Both
More info needed
The class intervals are mutually exclusive
All class intervals of a frequency distribution should be the same width
There should be no fewer than 5 classes
All of the above
A and c
There is only one mode
The mean minus the median results in a positive number
The median minus the mean is a positive number
A and b
A and c
Actual statistic
Weighted statistic
A and b
More info needed
Within 3 standard deviations of the mean of a normal distubition
Within one standard devaion of the mean of a normal distribution
Within 2 standard deviations of the mean of a normal distribution
Within the interquartile range
None
Normal distributions
Positively skewed distributions only
Neg skewed distributions only
Any non normal distribution
More info needed
Bar diagram
Frequency polygon
Pie chart
Frequency curve
None
Always
Never
Only when after applying struges rule our date exceeds the upper class limit of the last class
True
False
Ordinal
Nominal
Ratio
Interval
None
Mean
Median
Mode
All
None
Both the histogram and the frequency polygon are used for graphing quantitative date on an interval or ratio scale
A histogram is often used when graphing an ungrouped frequency distribution of a discrete variable
A polygon is often preferred for grouped frequency distributions
All
A and b
The standard deviation is responsive to the exact postion of every score in the distribution
The standard deviation is the best choice among measures of variability when the distribution is severely skewed
Both a and b
Neither
It is used to graphically display the cumulative frequency distributive
It is used to graphically display the relative frequency distribution
It is a graph that always has a negative slope
All
A and b