**CSIR Life Sciences Unit 13- Methods in Biology- Statistical Methods**

**1.The graph shown below generally represents (CSIR 2009)**

a) mean and standard error

b) mean and mode

c) mean and standard deviation

d) Mean and standard error

**2.Chi square test**

**X**

^{2 }b) to test the closeness of observed and expected frequency

c) to test the population variance and sample variance

d) all of these

**3. Find the mode in the following data set{11, 12,13,14,14}**

a) 11

b) 12.8

c) 13

d) 14

**4. Which of the following is not a measure of central tendency?**

a) Mean

b) Mode

c) Range

d) Median

**5. Standard deviation is the square of**

a) mode

b) standard error

c) variance

d) regression

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**6. Correlation coefficient is a number between**

a) +1 and +2

b) 0 and +1

c) -1 and 0

d) -1 and +1

**7. Chi square is zero when:**

a) expected frequency is lesser than the observed frequency

b) expected frequency is equal to the observed frequency

c) expected frequency is double that of the observed frequency

d) expected frequency is greater than the observed frequency

**8. A circle divided into sectors proportional to the frequency of items shown is called**

a) Bar chart

b) Pie chart

c) Histogram

d) Frequency polygon

**9. The statistical test can be utilized to validate the statement ‘ peoples having high cholesterol suffer more from hypertension”**

a) Student test

b) Regression analysis

c) Pearson correlation coefficient

d) ANOVA

**10. To determine variation in wing length of butterfly from five different places would be best best statistical test? (CSIR 2009)**

a) F test

b) Student t test

c) Regression analysis

d) Chi square test

**Learn more:**

**Answers:**

1. c) mean and standard deviation

2. d) all of these

3. d) 14

Mode is the most common item of a series

4. c) Range

5. c) variance

Variance=(Standard deviation)2

Standard deviation=Square root of Variance

6. d) -1 and +1

7. b) expected frequency is equal to the observed frequency

8. b) Pie chart

9. c) Pearson correlation coefficient

10. a) F test

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