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The two major types of statistics are ______ statistics and _____ statistics.
Inferential, Descriptive
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What is the difference in the conclusion drawn from a designed experiment an observational study?
Oberservational can only reveal association, where designed experiments can show causation
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Describe advantages and disadvantages of cluster sampling.
- Advantages: Easier, faster, less expensive
- Disadvantage: cluster sampling is not that accurate, each cluster will probably not be the same as the other clusters
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Age Percentage not covered
18-24 28.2
25-39 24.9
40-54 19.1
55-65 16.5
Classify the study as either descriptive or inferential
Inferential
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Define Observational Study
researchers observe characteristics and take measurements
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Define Designed experiment
researchers impose treatments and controls
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Descriptive Statistics
consists of methods for organizing and summarizing information
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inferential statistics
consists of methods for drawing and measuring the reliability of conclusions about a population based on info obtained from a sample of the population
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Contingency table represent what specific kind of discrete data
bivariate data
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what is the equation for Chebyshev's Rule
100(1-(1/k2) %
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How many data points are you trimming off for 20 data points with a 10% trimmed mean?
4 in total...2 on top and 2 on the bottom
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Qualitative variable
nonnumerical variable
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Quantitative variable
numerical variable
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variable
characteristic that varies from one person or thing to another
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data
values of a variable
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qualitative data
values of a qualitative variable
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quantitative data
values of a quantitative variable
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discrete variable
quantitative variable whose possible values can be listed
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continuous variable
quantitative variable whose possible values form some interval of numbers
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a table that provides the classes, frequencies, relative frequencies, and midpoints of a data is called a _______
grouped-data table
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A positive Z score indicates that the observation is ______ the mean, whereas a negative Z score indicates that the observation is _____ the mean.
above, below
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A standardized variable always has mean ____ and standard deviation ____
0, 1
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interpret this z score.
Z = 10.16 - 3.00 = 2.24
3.20
the data 10.16 is 2.24 standard deviation above the mean of 3.00
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difference between a parameter and a statistic
a parameter is a measure of the population and a statistic is a measure of a sample
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mutually exclusive events
no two of them have outcomes in common
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