# GATE (Graduate Aptitude Test in Engineering) Ecology: Questions 19 - 21 of 45

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## Question 19

Appeared in Year: 2019

### Question

MCQ▾

The mean height of students in a class (number of students, n = 10) was initially estimated to be 6 feet and 6 inches. Later an error was detected, where one boy՚s height was recorded as 10 feet taller than his actual height. The correct mean height of the students in the class is

Inches (round off to 1 decimal place)

### Choices

Choice (4)Response

a.

55.2 to 61.1

b.

65.9 to 66.1

c.

66.5 to 65.2

d.

None of the above

## Question 20

Costs and Benefits of Group-Living

Appeared in Year: 2019

### Question

MCQ▾

Which of the following is NOT an example of cooperative behaviour?

### Choices

Choice (4)Response

a.

Sentinel behaviour

b.

Biofilm formation

c.

Reproductive division of labour

d.

Lek formation

## Question 21

Test Statistics like T-Test and Chi-Square Test

Appeared in Year: 2019

### Question

MCQ▾

To compare biomass of a fish species in two lakes, A and B, a researcher records live- weights of 30 individuals from each lake. She assumes that these two datasets are normally distributed and have equal variance. She calculates

Where and are mean values from the respective lakes, and S is the pooled standard error.

What is this quantity Q?

### Choices

Choice (4)Response

a.

t-statistic

b.

Correlation coefficient

c.

Regression coefficient

d.

-statistic

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