STT205

Category: STT205

ATTENTION:

Kindly note that you will be presented with 50 questions randomized from the NOUN question bank. Make sure to take the quiz multiple times so you can get familiar with the questions and answers, as new questions are randomized in each attempt.

Good luck!

STT205

1 / 50

1. The square root of the sum of deviations of a set of numbers from their arithmetic mean is

A. minimum

B. standard deviation

C. zero

D. maximum

2 / 50

The suitable average for qualitative data is: ________

3 / 50

If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:_________

4 / 50

4. Which of the following is not a source of data?

A. Statistical information in business

B. Macro-statistical information

C. Micro-statistical information

D. survey designs

5 / 50

5. 36. If 5, 8, 6 and 2 occur with frequencies 3, 2, 4 and 1 respectively, find the mean

A. 9.7

B. 5.75

C. 15.7

D. 5.7

6 / 50

 The first step in calculating the median of a discrete variable is to determine the: _______

7 / 50

 If the smallest observation in a data is decreased, the average which is not affected is: ____

8 / 50

8. If the mode of the distribution is X the [frac{X}{2}] in the table below is _____________

A. 18

B. 2.5

C. 9

D. 3

9 / 50

9. Calculate 70% of the mean of the set of data in the table below

A. 2.975

B. 29.75

C. 4.25

D. 42.5

10 / 50

10. Primary data is not collected through ___________

A. experiments

B. gazettes

C. observations

D. surveys

11 / 50

11. In an examination the score obtained is weighted 3 times as much as a test score. If a student scored 85% in the examination with a test score of 90%, what is his mean score

A. 0.9

B. 0.8625

C. 0.8825

D. 0.937

12 / 50

12. What is the cumulative frequency of 40 in table below?

A. 7

B. 9

C. \[\frac{9}{20}\]

D. 10

13 / 50

13.

The median is considered a robust measure because it is resistant to: ________

14 / 50

14. An impossible event has the probability ______

A. 1

B. 0

C. 0.5

D. 0.25

15 / 50

15. The empirical relationship between the mean and median is given by; mean �?? mode = x(mean �?? median) in the table below . Then x is _________________

A. 1.0

B. 4.0

C. 3.0

D. 4.5

16 / 50

16. _____ is the degree of peakness of a distribution

A. kurtosis

B. symmetry

C. variation

D. platykurtic

17 / 50

17.

Ten families have an average of 2 boys. How many boys do they have together?

18 / 50

18.

The frequency distribution of the hourly wage rate of 60 employees of a paper mill is as follows: The mean wage rate is:N______

19 / 50

19. Suppose there are 70 students in an examination with the students writing at least one of the subjects; Chemistry, Physics and Biology. Thirty(30) students offer Physics, 33 offer Chemistry and 40 offer biology, 10 students offer both Physics and Chemistry. Fourteen (14) of the students offer Physics and Biology, and 15 of them offer Biology and Chemistry. How many students offer only Biology

A. 10

B. 11

C. 17

D. 20

20 / 50

20.

When the values in a series are not of equal importance, we calculate the: _____________

21 / 50

21.

The total of all the observations divided by the number of observations is called: ______

22 / 50

22.

Step deviation method or coding method is used for computation of the______

23 / 50

23. Which of these is closer to the mode for a skewed distribution?

A. median

B. mean

C. skewness

D. modal

24 / 50

24.

The sum of deviations is zero when deviations are taken from:________

25 / 50

25. The sum of the frequencies of 16 and 18 in the table below is _____________

A. 12

B. 15

C. 3

D. 14

26 / 50

26. The addition rule of probability is used for ___ events

A. mutually inclusive

B. independent

C. dependent

D. mutually exclusive

27 / 50

27.

If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ________

28 / 50

28.

The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: ______

29 / 50

29.

The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______

30 / 50

30.

Sum of absolute deviations of the values is least when deviations are taken from: ________

31 / 50

31.

The arithmetic mean is highly affected by: ________

32 / 50

32. ____ is not an advantage of secondary data

A. They are inexpensive to collect

B. They are available on a wide range of subjects

C. They are the most appropriate for any statistical work

D. They can be used to establish trends for forecasting

33 / 50

33.

The sum of deviations taken from mean is: _______________

34 / 50

34. The following are examples of discrete random variables except

A. Poisson Distribution

B. Normal Distribution

C. Binomial distribution

D. Bernoulli distribution

35 / 50

35. If at least one of the events of an experiment can occur, then they are said to be ________ events

A. independent

B. mutually exclusive

C. collectively exhaustive

D. dependent

36 / 50

36. Suppose there are 70 students in an examination with the students writing at least one of the subjects; Chemistry, Physics and Biology. Thirty(30) students offer Physics, 33 offer Chemistry and 40 offer biology, 10 students offer both Physics and Chemistry. Fourteen (14) of the students offer Physics and Biology, and 15 of them offer Biology and Chemistry. Find the number of students that offer all subjects

A. 8

B. 7

C. 6

D. 11

37 / 50

37.

Given X1=20 and X2=-20. The arithmetic mean will be: ________

38 / 50

38. A characteristics that assumes different values for different entities is called __________________

A. sample

B. variable

C. population

D. random

39 / 50

39.

Scores that differ greatly from the measures of central tendency are called:_________

40 / 50

40.

The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:____

41 / 50

41. The square root of the sum of deviations of a set of numbers from their arithmetic mean is ___________

A. standard deviation

B. minimum

C. maximum

D. zero

42 / 50

42. Which of the following statement does not represent a role of statistics in the society?

A. Government uses statistics as a tool for collecting economic aggregates

B. Government uses statistics to measure the effect of external factors on its policies

C. Businesses use statistics to monitor the national economy

D. Government uses statistics only for census

43 / 50

43. ____ statistics deals with methods of organizing, summarizing and presenting data in an informative way

A. Inferential

B. Inductive

C. Descriptive

D. Frequency

44 / 50

44. What is the probability of not getting a 1 in the toss of a single die?

A. \[\frac{3}{5}\]

B. \[\frac{5}{6}\]

C. \[\frac{2}{3}\]

D. \[\frac{1}{6}\]

45 / 50

45. The first step involved in constructing a group frequency distribution is to _________ (a) (b) count the number of items

A. count the number of items

B. tally

C. distribute

D. determine the number of classes

46 / 50

46. What is the geometric mean of 3, 5, 6, and 7

A. 3.21

B. 5.01

C. 4.33

D. 4.21

47 / 50

47. What is the sum of the medians of {3, 4, 4, 5, 6, 8, 8, 10} and {5, 5, 7, 9, 11, 12, 15, 18}

A. 10.5

B. 15.5

C. 25.5

D. 19.5

48 / 50

48. Calculate the standard deviation of the set of data in the table below

A. 51.56

B. 56.51

C. 13.73

D. 56.65

49 / 50

49. What is the relative cumulative frequency of 50 in the table below

A. 16

B. \[\frac{7}{20}\]

C. \[\frac{4}{5}\]

D. 1

50 / 50

50.

The sample mean X- is an example of a: ________________

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