Term
| The set of all individuals/units of interest is the .... |
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Definition
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Term
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Definition
| A numerical characteristic of a population |
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Term
True or False
A parameter is usually not actually known |
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Definition
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Term
| A subset of individualss or units is..... |
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Definition
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Term
| The numerical characteristic of a sample is.... |
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Definition
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Term
| A voluntary response sample is... |
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Definition
When individuals self-select to participate as part of the sample
Heavily biased! |
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Term
| Simple random sampling is... |
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Definition
| a random sample of size n, where each possible sample of size n has an equal chance of being selected |
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Term
| What is stratified random sampling? |
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Definition
| dividing populations into different groups (strata), and drawing a simple random sample from each stratum |
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Term
| What is a response variable? |
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Definition
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Term
| What is an explanatory variable? |
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Definition
| explains or possibly causes changes in the response |
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Term
| What is a lurking variable? |
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Definition
| an unmeasurable variable that may be responsible for the observed relationship |
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Term
| Two variables are confounded if.... |
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Definition
| it is impossible to separate their effects on the response variable |
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Term
| A variable that falls into one of two or more categories is... |
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Definition
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Term
| A quantitative variable is... |
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Definition
| a numeric variable that represents a measurable quantity |
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Term
| What are examples of measures of central tendancy? |
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Definition
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Term
| A distribution with two peaks is called... |
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Definition
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Term
| A distribution that is skewed to the right will _______ as x increases |
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Definition
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Term
| A distribution that is skewed to the left will _______ as x increases |
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Definition
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Term
| If n is odd, how do you calculate the median? |
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Definition
| take the average of the two middle values |
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Term
| For left skewed distributions, the mean is _____ than the median |
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Definition
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Term
| For right skewed distributions, the mean is ______ than the median |
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Definition
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Term
| The average squared distance from the mean is... |
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Definition
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Term
| The standard deviation can be found by... |
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Definition
| taking the square root of the sample variance |
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Term
| What does a Z-score measure? |
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Definition
| How many standard deviations an observation is above or below the mean |
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Term
| What is the unit for Z-scores? |
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Definition
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Term
| Z scores have a mean of ___ and a standard deviation of ____ |
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Definition
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Term
| Can percentiles be negative? |
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Definition
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Term
| Q1 is the ____ percentile |
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Definition
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Term
| Q2 is the ____ percentile |
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Definition
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Term
| Q3 is the ______ percentile |
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Definition
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Term
| How do you calculate interquartile range? |
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Definition
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Term
| Boxplots extend from _____ to ______ |
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Definition
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Term
| The central line in a boxplot is.... |
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Definition
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Term
| If you multiple each original value of a sample set by 4, what will happen to the median? The sample variance? |
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Definition
Median is multiplied by 4
's' is multiplied by 4 |
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Term
| If you add 3 to each original value of a sample set, what will happen to the median? The sample variance? |
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Definition
Median increases by 3
's' does not change |
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Term
True or False
Adding a constant changes the variability of observations but not their location |
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Definition
False
Changes the location but not the variability |
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Term
True or False
Multiplying by a constant changes the location and the variability of the observations |
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Definition
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