There are 35 students in class A. On average their exam grade was equal to 62 with a standard deviation equal to 12.4. There are 44 students in class B. On average their exam grade was equal to 57.3 with a standard deviation equal to 10.4. Test the hypothesis that the average grade of the two classes is the same, using a significance level of 5%. What is the absolute value of the teststatistic (“t”)? Round your answer to one decimal place. Use at least 5 decimals in all your computations.
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.
There are 35 students in class A. On average their exam grade was equal to 62 with a standard deviation equal to 12.4. There are 44 students in class B. On average their exam grade was equal to 57.3 with a standard deviation equal to 10.4. Test the hypothesis that the average grade of the two classes is the same, using a significance level of 5%. What is the absolute value of the teststatistic (“t”)? Round your answer to one decimal place. Use at least 5 decimals in all your computations.
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