# Statistics in Psychology Past Papers

**OBJECTIVE]**

**Subject:** Statistics in Psychology

**Time Allowed:** 15 Minutes

**Maximum Marks:** 10

**NOTE:** *Attempt this Paper on this Question Sheet only. Please encircle the correct option. Division of marks is given in front of each question. This Paper will be collected back after expiry of time limit mentioned above.*

__Part-I Encircle the right answer, cutting and overwriting is not allowed. (10)__

1. Which of the following is affected by extreme scores?

(a) The mean

(b) The median

(c) The mode

(d) None of the above will be affected

2. Appropriate graph to present frequencies of three categories of products is

(a) bar diagram

(b) histogram

(c) polygon

(d) ogive

3. In my experiment, fam going to investigate how sleep affects anxiety. The number of hours of sleep the subjects have is called the variable.

(a) Independent

(b) Extraneous

(c) Dependent

(d) Control!

4. Power of a test is

(a) The probability of accepting the null hypothesis when it is true.

(b) The probability of accepting the null hypothesis when it is false.

(c) The probability of rejecting the null hypothesis when it is true.

(d) The probability of rejecting the null hypothesis when it is false.

5. Assume that a chi-square test is to be performed on a contingency table with four rows and four columns. What should be the degree of freedom?

(a) 16

(b) 4

(c) 8

(d) 9

6. The analysis of variance is used in testing os .

a) The equality of more than two population variances

b) The equality of more than two population means

c) The equality of more than two population standard deviations

d) None of these .

7. If the independent and dependent variables both increase in an estimating equation, the coefficient of correlation will be in the range

a) 0 to -1

b) 0 to 1

c) Exact zero

d) None of these

8. If a=4 and b=2 for a particular regression equation and the independent variable has a value of 3, then the value of dependent variable is

a) 14

b) 10

c) 9

d) -2

9. To perform the Mann-Whitney test.

a) The scores are ranked separately for each group.

b) The scores are combined into one large group before ranking.

c) The two groups must be the same size.

d) The ranks for one group are added to the ranks for the other group.

10. Chi square test of independence measures

a) If two variables are different from each other

b) If two variables are independent of each other

c) if variables follow a theoretical distribution

d) Both b and c

**[SUBJECTIVE]**

**Subject:** Statistics in Psychology

**Time Allowed:** 2 Hour and 45 Minutes

**Maximum Marks:** 50

**NOTE:** *ATTEMPT THIS (SUBJECTIVE) ON THE SEPARATE ANSWER SHEET PROVIDED.*

__Part-II Give Short answers, Each question carries equal marks. (20)__

**Q#**1: Define frequency distribution and its types. .

**Q#**2: Write down empirical relationship between mean, median and mode when data is normal.

**Q#**3: Define Z-score and its purpose.

**Q#**4: Define type I and type [I errors.

**Q#**5: What are measures of dispersion/variability? .

**Q#**6: Define level of significance and p-value.

**Q#**7: Differentiate between regression and correlation.

**Q#**8: What is Critical region?

**Q#**9: Write down name of common Non-parametric tests.

**Q#**10: What do you mean by tied ranks?

__Part-III Give detailed answers, Each question carries equal marks. (30)__

**Q#**1: The skull breadths of a certain pupation of rodent follows normal distribution with mean 50 mm and standard deviation 10 mm. Find the proportion of rodents whose skull breadth is .

- More than 75 mm
- Less than 40 mm Marks 10

**Q#**2: For the given data below, the marks in two subjects “X” and “Y”

**X** 26 25 33 35 22 48 18 20 41 49

**Y** 43 89 42 73 34 51 82 28 39 85

**Compute Pearson’s correlation coefficient.**

**Q#**3: Following are pre course and post course scores of students. Find if there is any significant mean difference at alpha.

**Pre** 18 21 16 22 19 24 21 17 18 14

**Post** 22 25 17 24 29 30 29 27 20 20