The average score of everyone in the world that takes the quantitative section of the GRE is 151.3 with a standard deviation of 8.7. There is a new website that sells tutoring for GRE and advertises that the average score for their first 25 students was 154.9 which is a statistically significant increase. Which statistical test would be best to determine if the student scores are significantly different from the population average? Z test One sample t test Dependent samples t test Independent samples t tes
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.
The average score of everyone in the world that takes the quantitative section of the GRE is 151.3 with a standard deviation of 8.7. There is a new website that sells tutoring for GRE and advertises that the average score for their first 25 students was 154.9 which is a statistically significant increase. Which statistical test would be best to determine if the student scores are significantly different from the population average?
Z test
One sample t test
Dependent samples t test
Independent samples t test
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