A school district wanted to compare ACT scores between two of its schools (school A and school B). The dotplots below summarize the ACT scores for simple random samples of 30 students from each The median score was 22 for both samples. Which of the following statements is true about the mean ACT for each sample? O The mean score for the sample from school A is equal to the mean score for the sample from schoo school. B. ACT Scores O The mean score for the sample from school A is less than the mean score for the sample from school B. O The mean score for the sample from school A is greater than the mean score for the sample from school B. OWe cannot determine the relationship between the mean ACT scores without knowing the actual .. .. .. School A
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.
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