Bio Quiz 6-11-08
Terms
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- probability
- inferential statistics provides a measure of ____ that the inference drawn from a sample of a population would have been the same if another sample of this population has been studied
- inferential
- people use ______ statistics to determine a specific value that best describes the property of all members of a population
- null hypothesis
- the assumption that any differences that are observed do not really represent actual diferences but are in fact due to chance errors in sampling and measurements is called ___
- squaring
- ___ the deviations from the mean will convert all fo them to positive values which will convert all of them to positive values which will give a positive sum
- t test
- a way to test the null hypothesis
- abscissa
- when graphing frequency distributions, the values of measurements are plotted along the ___
- average
- the sample mean is also reffered to as ______
- inferential statistics
- a type of statistic that is used to infer or suggest a common property of a large number of items a population) from analysis of only a portion of them (a sample)
- continuum
- for the measurments to have a normal distribution, the measurements theselves must represent values of a ____
- perimental procedures, imprecision, measurement errors
- variations between individual members may be caused by (3 things)
- descriptive statistics
- a type of statistics that involves tabulating or graphing collections of data and calculating averages and standard deviations
- n-1
- what is the degree of freedom
- bias
- if some members are more likely to be selected than others, the sample is said to be ___
- 99
- three standard deviations covers what percentage of the population
- normal distribution
- when the graph has a bell shape, the sample is said to be a ___
- random
- a critical requirement for being able to draw valid inferences is that the variability is ____
- skewed
- if it is more likely that a measurment comes out too high than too low, the error is not random but _____
- sample size increases
- a typical feature of a sample mean is that it represents a property ever more accurately as the ____ ____ ____
- frequency distributions
- a graphic presentation of the variability of a sample is a graph of ____ ____
- varience, standard deviation
- a quantitative assesment of the spread of measurements is provided by the numerical navlues of ____ and ___ ____
- 95
- two standard deviations covers what percentage of the population
- to avoid bias
- why is N-1 used instead of just N