About 300 secretaries work in a government agency. Their average keyboard usage rate is 65 words per minute and the standard deviation is 6 words. In order to increase this average, a course is organized for all secretaries. After the course, the keyboard usage speed of a randomly selected group of secretaries among the trainees was found as follows. Has the course had an impact? Indicate which test you did, your results, mean and st. tabulate the deviation. 71 86 77 76 74 60 64 76 73 61 80 75 78 66 Calculate the quartiles of the data in the first question. Comment on the variation in the sequence?
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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