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

A. Frequency

B. Inferential

C. Descriptive

D. Inductive

2 / 50

2. ______ is not a measure of dispersion

A. mean

B. coefficient of variation

C. standard deviation

D. variance

3 / 50

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

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

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

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

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

4 / 50

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

5 / 50

5. What is the range of the set of data in the below

A. 6

B. 21

C. 17

D. 6.5

6 / 50

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

A. 4.0

B. 1.0

C. 3.0

D. 4.5

7 / 50

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

8 / 50

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

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

A. 13.73

B. 56.65

C. 51.56

D. 56.51

10 / 50

10.

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

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11. A set of data with only one mode is said to be __________

A. unimodal

B. unicmodal

C. singlemodal

D. uniquemodal

12 / 50

12. Any arrangement of r objects selected from a single group of n possible objects is called a ___________

A. combination

B. notation

C. permutation

D. factorial

13 / 50

13. A Poisson distribution is given by [p(x)=frac{0.72^{x} e^{-0.72}}{x!}]. Calculate the variance

A. 2.27

B. 0.72

C. 5.72

D. 0.23

14 / 50

14. The 75th percentile is the same as the ____ quartile

A. 1st

B. 3rd

C. 4th

D. 2nd

15 / 50

15.

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

16 / 50

16.

The sum of the squares of the deviations about mean divided by the number of observations is: ________

17 / 50

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

A. independent

B. dependent

C. collectively exhaustive

D. mutually exclusive

18 / 50

18.

The arithmetic mean is highly affected by: ________

19 / 50

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

A. 9

B. 3

C. 2.5

D. 18

20 / 50

20.

Any measure indicating the Centre of a set of data, arranged in an increasing or decreasing order of magnitude, is called a measure of: ______

21 / 50

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

A. 3

B. 14

C. 15

D. 12

22 / 50

22. 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. 19.5

B. 15.5

C. 10.5

D. 25.5

23 / 50

23. ____ is not an axiom of probability

A. \[P(E)\leq 1\]

B. \[P(\Omega)= 1\]

C. \[P(\Omega)= 0\]

D. \[P(E)\leq 0\]

24 / 50

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

A. zero

B. maximum

C. standard deviation

D. minimum

25 / 50

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

A. 5.75

B. 15.7

C. 9.7

D. 5.7

26 / 50

26. 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. 0.937

C. 0.8825

D. 0.8625

27 / 50

27. 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

28 / 50

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

A. random

B. population

C. variable

D. sample

29 / 50

29.

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

30 / 50

30. ____ is not an advantage of secondary data

A. They can be used to establish trends for forecasting

B. They are inexpensive to collect

C. They are the most appropriate for any statistical work

D. They are available on a wide range of subjects

31 / 50

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

A. Macro-statistical information

B. Statistical information in business

C. survey designs

D. Micro-statistical information

32 / 50

32.

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

33 / 50

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

A. Government uses statistics only for census

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 as a tool for collecting economic aggregates

34 / 50

34. An impossible event has the probability ______

A. 0

B. 0.5

C. 1

D. 0.25

35 / 50

35.

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

36 / 50

36.

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

37 / 50

37.

What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______

38 / 50

38. A frequency curve of a normal distribution is ____ shaped

A. bell

B. cup

C. octagon

D. oblong

39 / 50

39.

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

40 / 50

40.

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

41 / 50

41.

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

42 / 50

42. _____ is the degree of peakness of a distribution

A. kurtosis

B. variation

C. platykurtic

D. symmetry

43 / 50

43.

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

44 / 50

44. The following are examples of discrete random variables except

A. Bernoulli distribution

B. Poisson Distribution

C. Normal Distribution

D. Binomial distribution

45 / 50

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

A. skewness

B. mean

C. median

D. modal

46 / 50

46. Primary data is not collected through ___________

A. surveys

B. gazettes

C. experiments

D. observations

47 / 50

47. There are 5 different items to be stocked in a store with 3 bins for the storage. What are the possible number of arrangements?

A. 36

B. 37

C. 55

D. 60

48 / 50

48.

The suitable average for qualitative data is: ________

49 / 50

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

A. minimum

B. maximum

C. standard deviation

D. zero

50 / 50

50.

When all the values in a series occur the equal number of times, then it is not possible to calculate the:__________

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