1)The analysis of the results of budget survey of 150 families gave an average monthly expenditure of $ 120 on food items with a standard deviation of $15. After the analysis was completed it was noted that figure recorded for one house-hold was wrongly taken as $15 instead of $ 105. Determine the correct value of the average expenditure and its standard deviation.
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.
1)The analysis of the results of budget survey of 150 families gave an average monthly expenditure of $ 120 on food items with a standard deviation of $15. After the analysis was completed it was noted that figure recorded for one house-hold was wrongly taken as $15 instead of $ 105. Determine the correct value of the average expenditure and its standard deviation.
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