1. A professor has been teaching statistics for many years. His records show that the overall mean for the final exam is 82 with a standard deviation of 16. The professor believes that this year’s class is superior. The mean for the final exam for this year’s class of 25 students is 87. α = 0.05 2tail d. calculates Cohen’s d for this experiment. What does it tell you? e. what would happen if the professor had more students(n=100)? f. What would have happened if we had decided to test the hypothesis with the original sample size using α = 0.05 1tail?
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.
1. A professor has been teaching statistics for many years. His records show that the overall
d. calculates Cohen’s d for this experiment. What does it tell you?
e. what would happen if the professor had more students(n=100)?
f. What would have happened if we had decided to test the hypothesis with the original sample size using α = 0.05 1tail?
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