Statistics

Statistics :

 IA 1 -

Here are the answers to your questions:

Question 1:

a. statistics in personnel management

Question 2:

c. Sample

Question 3:

c. descriptive statistics

Question 4:

b. Quantitative variable

Question 5:

d. Aggregate of facts

Question 6:

c. Published data

Question 7:

a. Statistics

Question 8:

d. Numerical Data

Question 9:

a. Methods

Question 10:

a. Continious data

Question 11:

a. Mean

Question 12:

b. 38

(Calculation: (30 + 46 + 35 + 21 + 53 + 43) / 6 = 228 / 6 = 38)

Question 13:

c. Mode

Question 14:

a. 5

Question 15:

b. 43.6

(Calculation: Original sum = 50 * 44 = 2200. Corrected sum = 2200 - 56 + 36 = 2180. Corrected mean = 2180 / 50 = 43.6)

Question 16:

c. 18

(Ordered data: 7, 10, 12, 15, 18, 20, 25, 38, 45. The median is the middle value, which is 18.)

Question 17:

c. 8

(Ordered data: 5, 5, 5, 8, 8, 9, 11. The median is the middle value, which is 8.)

Question 18:

b. range

Question 19:

c. 6

(Calculation: Sum of first 10 items = 10 * 4 = 40. Sum of next 5 items = 5 * 10 = 50. Combined sum = 40 + 50 = 90. Combined mean = 90 / (10 + 5) = 90 / 15 = 6)

Question 20:

d. The middle or approximate middle of the data set

IA 2 -

Question 1

The correct answer is c. Central tendency.

Question 2

The correct answer is b. Variance.

Question 3

The correct answer is c. Extreme scores.

Question 4

The correct answer is a. Class mark.

Question 5

The correct answer is c. Absolute measure of dispersion and Relative measure of dispersion.

Question 6

The correct answer is a. Standard deviation.

Question 7

The correct answer is c. It is a sensitive measure of dispersion.

Question 8

The correct answer is a. Measures of dispersion.

Question 9

The correct answer is a. Range.

Question 10

The correct answer is c. Negative.

Question 11

The correct answer is a. 4.5.

Question 12

To calculate the rank for the data, we need to rank each value.

Order the data: 21, 23, 43, 45, 56, 67.

Question 13

The correct answer is c. r = -0.6.

Question 14

The correct answer is d. The correlation is said to be positive.

Question 15

The correct answer is c. Regression.

Question 16

The correct answer is c. It is greater than or equal to the correlation coefficient.

Question 17

The correct answer is d. 20.

Range = Maximum value - Minimum value = 10 - (-10) = 10 + 10 = 20.

Question 18

The correct answer is a. 10.

Question 19

Let n be the number of participants, which is 10.

The initial rank correlation coefficient R 

1

​The correct answer is a. 0.933.

Question 20

The correct answer is c. The relationship between two variables is strong and but negative.

IA 3 -

Here are the answers to your multiple-choice questions:

Question 1

b. the regression model

Question 2

b. There is a link between one response variable and one or many explanatory variables

Question 3

d. each beer consumed increases blood alcohol by exactly 0.018

Question 4

c. one response and one or more explanatory variables are related

Question 5

a. response, or dependent, variable

Question 6

d. can be any units

Question 7

a. may be used to predict a value of y if the corresponding x value is given

Question 8

d. there is heteroscedasticity in the scatter plot.

Question 9

Question 10

c. Same

Question 11

b. Minimum

Question 12

a. Short term variation

Question 13

c. Historigram

Question 14

c. Cyclical trend

Question 15

a. Seasonal Variation

Question 16

a. Smooth out the time series

Question 17

d. time series data

Question 18

c. Irregular trend

Question 19

a. deseasonalize data

Question 20

d. 4