Is the average length of time to earn a doctorate different from one field to another? Independent random samples from large graduate schools gave the following averages for length of registered time (in years) from bachelor's degree to doctorate. Sample A was taken from the humanities field, and sample B from the social sciences field. (Reference: Education Statistics, U.S. Department of Education.) Field A 6.7 7.5 6.0 9.1 8.7 8.4 7.0 6.9 8.3 7.4 8.6 Field B 6.8 6.4 6.3 7.2 6.6 8.5 5.9 8.2 7.8 6.2 7.1 6.5 Use a 10% level of significance to test the claim that there is n
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.
Is the average length of time to earn a doctorate different from one field to another? Independent random samples from large graduate schools gave the following averages for length of registered time (in years) from bachelor's degree to doctorate. Sample A was taken from the humanities field, and sample B from the social sciences field. (Reference: Education Statistics, U.S. Department of Education.)
| Field A | 6.7 | 7.5 | 6.0 | 9.1 | 8.7 | 8.4 | 7.0 | 6.9 | 8.3 | 7.4 | 8.6 | |
| Field B | 6.8 | 6.4 | 6.3 | 7.2 | 6.6 | 8.5 | 5.9 | 8.2 | 7.8 | 6.2 | 7.1 | 6.5 |
Use a 10% level of significance to test the claim that there is no difference in the distributions of time to complete a doctorate for the two fields.
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