Question 2 Horseshoe crabs on a beach can be overturned by approaching waves. These "stranded" crabs may right themselves by turning over. During a period of many days on an Atlantic Ocean beach, investigators categorized a random sample of crabs as either stranded or not stranded and additionally noted their age category. The researchers wanted to investigate whether there is convincing evidence of an association between becoming stranded and age. Data from their study are shown in the following table. Horseshoe Crab Stranded Status Young Intermediate Adult Total Yes 41 125 52 218 No 153 364 70 587 Total 194 489 122 805 If becoming stranded and age are independent i these creatures, which of the following is closest to the expected number of young stranded horseshoe crabs? A 41 52.54 141.46 D 194 E 218
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.
Horseshoe crabs on a beach can be overturned by approaching waves. These “stranded” crabs may right themselves by turning over. During a period of many days on an Atlantic Ocean beach, investigators categorized a random sample of crabs as either stranded or not stranded and additionally noted their age category. The researchers wanted to investigate whether there is convincing evidence of an association between becoming stranded and age. Data from their study are shown in the following table.
Horseshoe Crab Stranded Status
| Young | Intermediate | Adult | Total | |
| Yes | 41 | 125 | 52 | 218 |
| No | 153 | 364 | 70 | 587 |
| Total | 194 | 489 | 122 | 805 |
If becoming stranded and age are independent in these creatures, which of the following is closest to the expected number of young stranded horseshoe crabs?
-
41
41A -
52.54
52.54B -
141.46
141.46C -
194
194D -
218
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