7.101 What is wrong? In each of the following situa- tions, identify what is wrong, and then either explain why it is wrong or change the wording of the statement to make it true. (a) To reduce the margin of error in half, the sample size- needs to be doubled. (b) The sign test for matched pairs is more powerful than the paired i test when the differences are close to Normal (c) When testing Ho: u = 10 versus the two-sided alternative, the power at u = 3 is larger than at u = 17.
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.
book name-Introduction to the practice of the statistics, chapter-7
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