Question No. 2: According to the "ALPHA" company, there employees generally spend more than 55 hours each week working on official duties. The following data show the number of hours worked per week for a sample of 13 IT department and a sample of 11 Accounts department. IT department: Accounts department: 57 60 56 57 58 59 56 62 61 58 59 66 64 64 65 68 59 71 64 64 62 63 66 58 a) What is the third quartile of spending working hours for Accounts department? b) Create a box plot for the number of hours worked for IT department. c) Develop a relative frequency distribution and a percent frequency distribution for the above departments. d) Calculate the z– score for the above data.
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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