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

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

2 / 50

The arithmetic mean is highly affected by: ________

3 / 50

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

4 / 50

4. ____ is not an axiom of probability

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

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

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

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

5 / 50

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

A. random

B. sample

C. population

D. variable

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. 4.5

B. 1.0

C. 4.0

D. 3.0

7 / 50

7. 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. 25.5

C. 15.5

D. 19.5

8 / 50

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

A. dependent

B. independent

C. collectively exhaustive

D. mutually exclusive

9 / 50

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

A. skewness

B. modal

C. mean

D. median

10 / 50

10.

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

11 / 50

11.

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

12 / 50

12.

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

13 / 50

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

A. 0.23

B. 5.72

C. 0.72

D. 2.27

14 / 50

14.

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

15 / 50

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

A. 5.01

B. 4.21

C. 4.33

D. 3.21

16 / 50

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

A. 3rd

B. 4th

C. 1st

D. 2nd

17 / 50

17.

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

18 / 50

18. 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. 0.8625

B. 0.937

C. 0.8825

D. 0.9

19 / 50

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

A. octagon

B. cup

C. bell

D. oblong

20 / 50

20.

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

21 / 50

21. ______ is not a measure of dispersion

A. standard deviation

B. coefficient of variation

C. variance

D. mean

22 / 50

22.

If âˆ‘i=110Xi-50=100 then sample mean X- will be: ________

23 / 50

23. The difference between the harmonic mean of 2, 4, 8 and their geometric mean is __________

A. 0.47

B. 0.48

C. 0.67

D. 0.57

24 / 50

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

A. minimum

B. zero

C. standard deviation

D. maximum

25 / 50

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

A. Businesses use statistics to monitor the national economy

B. Government uses statistics only for census

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

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

26 / 50

26. A student scored 45% in MTH101, 62% in MTH102, 30% in BUS103, and 70% in ACC101. Find his GPA if the respective credits are 3, 2, 2, 3

A. 3.90

B. 63%

C. 3.10

D. 2.90

27 / 50

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

A. 3

B. 18

C. 9

D. 2.5

28 / 50

28. The following are examples of discrete random variables except

A. Binomial distribution

B. Normal Distribution

C. Poisson Distribution

D. Bernoulli distribution

29 / 50

29.

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

30 / 50

30.

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

31 / 50

31.

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

32 / 50

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

A. zero

B. standard deviation

C. minimum

D. maximum

33 / 50

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

A. Frequency

B. Inferential

C. Descriptive

D. Inductive

34 / 50

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

A. 51.56

B. 56.65

C. 13.73

D. 56.51

35 / 50

35.

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

36 / 50

36.

The population mean Î¼ is an example of a: _________

37 / 50

37.

The sum of deviations taken from mean is: _______________

38 / 50

38.

 If the arithmetic mean of 20 values is 10, then sum of these 20 values is:_____

39 / 50

39. _____ is the degree of peakness of a distribution

A. variation

B. platykurtic

C. kurtosis

D. symmetry

40 / 50

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

A. mutually inclusive

B. independent

C. mutually exclusive

D. dependent

41 / 50

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

A. 6.5

B. 6

C. 17

D. 21

42 / 50

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

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

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

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

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

43 / 50

43.

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

44 / 50

44. An impossible event has the probability ______

A. 0.5

B. 0.25

C. 0

D. 1

45 / 50

45. Primary data is not collected through ___________

A. observations

B. gazettes

C. experiments

D. surveys

46 / 50

46.

The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________

47 / 50

47.

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

48 / 50

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

A. 5.7

B. 9.7

C. 15.7

D. 5.75

49 / 50

49. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They are available on a wide range of subjects

C. They are inexpensive to collect

D. They can be used to establish trends for forecasting

50 / 50

50.

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

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