The distribtuon is left skewed ( not normal distribtion) .the time spent on studying math for school children has mean of 18.5 hrs and st dev of 2.3 1 find the min proportion of children who spent 15 and 22 hrs on studying math in a week .can we say that more than 50% children will spend more than 15 hours on studying math in a week. 2 a sample of 50 children are selected. Find prob that the sample mean time spent on studying math in a week is higher than 19.5 hrs ina week
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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The distribtuon is left skewed ( not normal distribtion) .the time spent on studying math for school children has
1 find the min proportion of children who spent 15 and 22 hrs on studying math in a week .can we say that more than 50% children will spend more than 15 hours on studying math in a week.
2 a sample of 50 children are selected. Find prob that the sample mean time spent on studying math in a week is higher than 19.5 hrs ina week
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