A swimming coach wants to determine if her swimming lessons increase swimming speeds of her students (n = 25). She calculates an average speed in her sample of M = 4.5. She also knows that the average population swimming speed is about 4.2 with a population standard deviation of about 0.70. Which test would be appropriate for this research question? Dumbledore wanted to test Snape’s theory about who has better quidditch players. A sample of n1 = 9 students form Gryffindor had an average score of M1 = 21, SS1 = 230, and a sample of n2 = 10 students from Slytherin had an average score of M2 = 17, SS2 = 200. Which test would be appropriate for this research question?
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.
A swimming coach wants to determine if her swimming lessons increase swimming speeds of her students (n = 25). She calculates an average speed in her sample of M = 4.5. She also knows that the average population swimming speed is about 4.2 with a population standard deviation of about 0.70. Which test would be appropriate for this research question?
Dumbledore wanted to test Snape’s theory about who has better quidditch players. A sample of n1 = 9 students form Gryffindor had an average score of M1 = 21, SS1 = 230, and a sample of n2 = 10 students from Slytherin had an average score of M2 = 17, SS2 = 200. Which test would be appropriate for this research question?
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