Submit Assignment Exam 3 06_15_202 Question 20 - of 31 Step 1 of 1 00:55:38 Calculate the sample mean and sample variance for the following frequency distribution of heights in centimeters for a sample of 8-year-old boys. If necessary, round to one more decimal place than the largest number of decimal places given in the data. Heights in Centimeters Class AFrequency 122.1 - 125.6 46 125.7 - 129.2 39 129.3 - 132.8 23 132.9 - 136.4 21 136.5 - 140.0 21 Copy Data Prev Ne Answer(How to Enter) 2 Points Keypad Keyboard Shortcuts Sample mean:I Sample variance:
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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