SOLUTION The proportion of Y responses in this sample is 24 = 0.75 32 Using the population proportion of 0.6 (given earlier), the standard deviation for the distri- bution of sample proportions is p(1-p) 0.6 (1 0.6) 0.09 %3D 32 The sample statistic, p = 0.75, therefore has a standard score of %3D sample proportion – population proportion 0.75 0.6 = 1.67 = 2 standard deviation 0.09
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.
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