A random sample of 8 adults aged 30 years were asked how much they spent on medical costs in the year 2009. 300 140 5600 520 470 700 640 1200 Using the above data, compute: a) The sample mean b) The sample standard deviation c) The sample median d) The first and third quartiles.
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.
A random sample of 8 adults aged 30 years were asked how much they spent on medical costs in the year 2009.
300 140 5600 520 470 700 640 1200
Using the above data, compute:
a) The sample mean
b) The sample standard deviation
c) The sample median
d) The first and third
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