BUSINESS STATISTICS 621 assignment 1 1 Identify the appropriate measure of central tendency that can be used to find the average speed of a journey

Subject:BusinessPrice:9.82 Bought3

Share With

BUSINESS STATISTICS 621 assignment 1

1 Identify the appropriate measure of central tendency that can be used to find the average speed of a journey.

Select one:

a. Weighted mean

b. Geometric mean

c. Harmonic mean

d. Mode

2 A researcher finds a correlation of 0.40 between personal income and the number of years of college completed. Based upon this finding he can conclude that_________.

Select one:

a. more years of education causes higher income

b. more years of education are associated with higher income

c. personal income is a positively skewed variable

d. a person who attended four years of college will have an annual income of R40,000

3 he following Table show the number of hours worked by 200 statistics students:

Number of Hours	Frequency
0 - 9	40
10 - 19	50
20 - 29	70
30 - 39	40

 

Refer to the Table above. The cumulative relative frequency for the class of 10 - 19___.

Select one:

a. cannot be determined from the information given

b. is 0.45

c. is 0.25

d. is 90

4 The algebraic sum of deviations from mean is_______.

Select one:

a. Minimum

b. Maximum

c. Undefined

d. Zero

5 In regression analysis, the variable that is being predicted is the______.

Select one:

a. intervening variable

b. response or dependent variable

c. independent variable

d. is usually x

6 If the regression equation is equal to Y=23.6−54.2X, then 23.6 is the _____ while -54.2 is the ____ of the regression line.

Select one:

a. slope, regression coefficient

b. slope, intercept

c. intercept, slope

d. radius, intercept

7 If the equation of regression line is y =5, then what result will you take out from it?

Select one:

a. The line is parallel to y-axis

b. The line passes through (5, 0)

c. The line is parallel to x-axis

d. The line passes through origin

8 A politician who is running for the vacant Member of Parliament [MP] seat with 50 000 registered voters conducts a survey. In the survey, 60% of the 2 000 registered voters interviewed say they planned to vote for the MP. ________ is the sample statistic.

Select one:

a. 25000

b. 60%

c. 2000

d. statistical inferences

9 What does a coefficient of determination of 0.70 mean?

Select one:

a. Coefficient of determination is 0.49

b. 70% of the variation in dependent variable is explained by the independent variable

c. Coefficient of non-determination is 0.30

d. Almost no correlation because 0.70 is close to 1.0

10 Students divided into different groups according to their intelligence and gender. This is an example of____.

Select one:

a. quantitative data

b. continuous data

c. constant data

d. qualitative dat

11 In a sample of 800 students in a university, 20% of this sample are Business majors. Based on the above information, the school's paper reported that 20% of all the students at the university are Business majors." This report is an example of______.

Select one:

a. a population

b. statistical inference

c. a sample

d. descriptive statistics

12 A survey in which information is collected from each and every individual of the population is known as______.

Select one:

a. sample survey

b. census survey

c. pilot survey

d. biased survey

13 When the characteristic being studied is non-numeric, it is called a______.

Select one:

a. quantitative variable

b. qualitative variable

c. continuous variable

d. discrete variable

14 A politician who is running for the vacant Member of Parliament [MP] seat with 50 000 registered voters conducts a survey. In the survey, 60% of the 2 000 registered voters interviewed say they planned to vote for the MP. What is the random variable?

Select one:

a. The political choices of the registered voters

b. 2 000 registered voters

c. 50 000 voters

d. Member of Parliament

15 Using the following data set: 50, 60, 40, 30, 70, 90 and 80, the interquartile range of the data set is_____.

Select one:

a. 60

b. 30

c. 80

d. 40

16 Sample A consists of 9, 3, 8, 12, 4, 9 and 8. What is the value of n for this sample?

Select one:

a. 7

b. 8

c. 14

d. 3

17 Identify the appropriate measurement scale that is appropriate in rating (e.g. excellent, good, fair or poor) of the studying material for Business Statistics.

Select one:

a. Interval

b. Ratio scale

c. Ordinal scale

d. Mean

18  Which of the following is affected mostly by outliers?

Select one:

a. Mode

b. Standard deviation

c. Range

d. Variance

19 A variable that provides the basis for estimation is called____.

Select one:

a. independent variable

b. continuous variable

c. qualitative variable

d. dependent variable

 

20 The following Table show the number of hours worked by 200 statistics students:

Number of Hours	Frequency
0 - 9	40
10 - 19	50
20 - 29	70
30 - 39	40

 

Refer to the Table above. The cumulative frequency for all classes is______.

Select one:

a. 1

b. 200

c. 4

d. 0.4

21 The standard deviation of a sample of 100 observations equals 64. The variance of the sample equals______.

Select one:

a. 6,400

b. 10

c. 8

d. 4,096

22 Which of the following is not a characteristic of the mean?

Select one:

a. It is affected by extreme scores.

b. It minimizes the sum of squared deviations.

c. The sum of the deviations about the mean is 0.

d. It is best used with ordinal data

23 A regression equation was computed to be Y = 35 + 6X. The value of 35 indicates_______.

Select one:

a. the coefficient of determination

b. the slope

c. y-intercept where the regression line cuts the y-axis

d. X-intercept where the regression line cuts the X-axis

24 Largest value is 60 and smallest value is 40 and the number of classes desired is 5, then the class interval is_____.

Select one:

a. 25

b. 4

c. 20

d. 15

25  Listing of a data in the form in which they are collected are known as_______.

Select one:

a. arrayed data

b. raw data

c. qualitative data

d. secondary data