Games with Gretzky 41 4.73 1.29 Games without Gretzky 17 3.88 1.18
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.
Wayne Gretzky was one of the ice hockey most prolific scorers when he played for the Edmonton Oilers. During
his last season with the Oilers, Gretzky played in 41 games and missed 17 games due to injury. If you view
the 41 games with Gretzky as a random sample of all Oiler games in which Gretzky played and the 17 games
without Gretzky as a random sample of all Oiler games in which Gretzky did not play, is there convincing
evidence that the mean number of goals scored by the Oilers is higher for games when Gretzky plays?
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