The following table shows the annual income, in dollars, and amount spent on vacation, in dollars, for a sample of 8 families. Income 41,100 53,000 27,400 34,400 65,800 98,100 72,000 56,700 Vacation 2,700 2,400 1,700 2,500 2,800 5,100 4,200 3,200 (a) Create a scatterplot of the data in the table. (b) Describe the association shown in the scatterplot created in part (a). (c) Calculate the coefficient of determination for the data, and interpret the value in context.
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.
The following table shows the annual income, in dollars, and amount spent on vacation, in dollars, for a sample of 8 families.
| Income | 41,100 | 53,000 | 27,400 | 34,400 | 65,800 | 98,100 | 72,000 | 56,700 |
| Vacation | 2,700 | 2,400 | 1,700 | 2,500 | 2,800 | 5,100 | 4,200 | 3,200 |
(a) Create a scatterplot of the data in the table.
(b) Describe the association shown in the scatterplot created in part (a).
(c) Calculate the coefficient of determination for the data, and interpret the value in context.
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