Practice For a population with standard deviation = 16 how large a sample is necessary to have a standard error that is a) Less than 8 points b) Less than 4 points c) Less than 2 points
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.
My professor gave this question (attachment) and provided the answer in a lecture but did not explain how she obtained the answers. Could you please help me understand it better, I have also included the formula we use for standard error.
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