Being overweight or obese may increases your risk of developing high blood pressure. The weight and systolic blood pressure of 13 randomly selected males in the age group 25 to 30 are shown in the table below. Subject Weight (lb) Systolic BP (mmHg) 1 164 130 2 167 133 3 180 146 4 155 128 5 210 151 6 175 146 7 190 150 8 202 140 9 200 148 10 149 125 11 158 133 12 169 135 13 170 143 Decide which variable should be the response variable (y) and which should be the explanatory variable (x). Describe the relationship. You may draw the scatter plot if you like, but it is not required. What is the correlation of coefficient? What can you tell from the correlation of coefficient?
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.
Being overweight or obese may increases your risk of developing high blood pressure. The weight and systolic blood pressure of 13 randomly selected males in the age group 25 to 30 are shown in the table below.
|
Subject |
Weight (lb) |
Systolic BP (mmHg) |
|
1 |
164 |
130 |
|
2 |
167 |
133 |
|
3 |
180 |
146 |
|
4 |
155 |
128 |
|
5 |
210 |
151 |
|
6 |
175 |
146 |
|
7 |
190 |
150 |
|
8 |
202 |
140 |
|
9 |
200 |
148 |
|
10 |
149 |
125 |
|
11 |
158 |
133 |
|
12 |
169 |
135 |
|
13 |
170 |
143 |
- Decide which variable should be the response variable (y) and which should be
the explanatory variable (x).
- Describe the relationship. You may draw the
scatter plot if you like, but it is not required.
- What is the
correlation of coefficient ? What can you tell from the correlation of coefficient?
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