Streams. Researchers in the Adirondack Mountainscollect data on a random sample of streams each year.One of the variables recorded is the substrate of thestream—the type of soil and rock over which they flow.The researchers want to estimate the proportion of streams that have a substrate of shale to within a mar-gin of error of 7% (with 95% confidence). How many streams must they sample?
Inverse Normal Distribution
The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.
Mean, Median, Mode
It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.
Z-Scores
A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.
collect data on a random sample of streams each year.
One of the variables recorded is the substrate of the
stream—the type of soil and rock over which they flow.
The researchers want to estimate the proportion of
gin of error of 7% (with 95% confidence). How many
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