A Kean University professor teaches Business Statistics at both Ocean and Union campuses. The professor wants to study the number of years students have used Excel spreadsheets. The following table contains information regarding the students’ spreadsheet usage over the years. Campus Ocean Union Sample Size 62 51 Sample Mean (year) 3.8 4.5 Sample Standard Deviation (year) 0.8 1.2 Using a 0.01 level of significance, is there evidence that students at Ocean have used excel fewer years than those at Union?
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 Kean University professor teaches Business Statistics at both Ocean and Union campuses. The professor wants to study the number of years students have used Excel spreadsheets. The following table contains information regarding the students’ spreadsheet usage over the years.
Campus
Ocean Union
62 51
Sample Mean (year)
3.8 4.5
Sample Standard Deviation (year)
0.8 1.2
Using a 0.01 level of significance, is there evidence that students at Ocean have used excel fewer years than those at Union?
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