A random sample of 100 drivers was asked how many times they had to take driving test to gain their driving licence. It was found that more than half of them needed to take the test exactly 2 times and nobody needed to take the test more than 6 times. Which of the following are valid conclusions about the mean of the number of times they had to take the driving test? Answers: It is greater than 2. It is equal to 2. It is not equal to 5. It is greater than 1 but less than 4.
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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