A researcher wanted to determine the number of televisions in households. He 1 1 3 3 3 4 10 conducts a survey of 40 randomly selected households and obtained the data to the right. Draw a dot plot of the televisions per household. 2 2 3 1 1 2 1 2 3 1 1 4 1 2 2 2 1 1 Choose the correct dot plot below. A. O B. OC. OD. Number of Televisions Number of Televisions Number of Televisions Number of Televisions ........ ........ *******....***
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 Dot Plot is a type of simple histogram-like chart used in statistics for relatively small data sets where values fall into a number of discrete bins or categories.
To draw a dot plot, simply count the number of data points falling in each bin and draw a stack of dots that number high for each .
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