"Radon: The Problem No One Wants to Face" is the title of an article appearing in Consumer Reports. Radon is a gas emitted from the ground that can collect in houses and buildings. At certain levels it can cause lung cancer. Radon concentrations are measured in picocuries per liter (pCi/L). A radon level of 4 pCi/L is considered "acceptable." Radon levels in a house vary from week to week. In one house, a sample of 8 weeks had the following readings for radon level (in pCi/L). 1.9 2.4 5.7 4.3 1.9 8.5 3.9 7.7 (a) Find the mean, median, and mode. mean median mode (b) Find the sample standard deviation, coefficient of variation, and range. (Round your standard deviation to four decimal places and your coefficient of variation to two decimal places.) s CV % range (c) Based on the data, would you recommend radon mitigation in this house? Explain. Yes, since the median value is over "acceptable" ranges, although the mean value is not. No, since the average and median values are both under "acceptable" ranges. Yes, since the average and median values are both over "acceptable" ranges. Yes, since the average value is over "acceptable" ranges, although the median value is not.
Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.
"Radon: The Problem No One Wants to Face" is the title of an article appearing in Consumer Reports. Radon is a gas emitted from the ground that can collect in houses and buildings. At certain levels it can cause lung cancer. Radon concentrations are measured in picocuries per liter (pCi/L). A radon level of 4 pCi/L is considered "acceptable." Radon levels in a house vary from week to week. In one house, a sample of 8 weeks had the following readings for radon level (in pCi/L).
| 1.9 | 2.4 | 5.7 | 4.3 | 1.9 | 8.5 | 3.9 | 7.7 |
(a) Find the mean,
| mean | |
| median | |
| mode |
(b) Find the sample standard deviation, coefficient of variation, and
| s | |
| CV | % |
| range |
(c) Based on the data, would you recommend radon mitigation in this house? Explain.
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