The scores on a(hypothetical) vocabulary test of a group of 20 year olds and a group of 60 year olds are shown below. 20 year olds: 27,26,21,24,15,18,17,12,13 60 year olds: 26,29,29,29,27,16,20,27 a) test the mean difference for significance using the .05 level. b) list the assumptions made in computing your answer
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 scores on a(hypothetical) vocabulary test of a group of 20 year olds and a group of 60 year olds are shown below.
20 year olds: 27,26,21,24,15,18,17,12,13
60 year olds: 26,29,29,29,27,16,20,27
a) test the mean difference for significance using the .05 level.
b) list the assumptions made in computing your answer
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