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

A. Macro-statistical information

B. survey designs

C. Micro-statistical information

D. Statistical information in business

2 / 50

2. 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. 7

B. 11

C. 6

D. 8

3 / 50

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

A. combination

B. notation

C. factorial

D. permutation

4 / 50

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

5 / 50

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

6 / 50

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

A. unicmodal

B. singlemodal

C. unimodal

D. uniquemodal

7 / 50

The elimination of extreme scores at the top of the set has the effect of:_________

8 / 50

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

9 / 50

9. 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

10 / 50

10. 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. 2.90

B. 3.90

C. 3.10

D. 63%

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11. 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

12 / 50

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

A. 13.73

B. 51.56

C. 56.51

D. 56.65

13 / 50

13.

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

14 / 50

14.

The arithmetic mean is highly affected by: ________

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15.

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

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16.

The population mean Î¼ is an example of a: _________

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17.

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

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18. 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

19 / 50

19. 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

20 / 50

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

A. 7

B. 9

C. 10

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

21 / 50

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

A. 2.27

B. 5.72

C. 0.23

D. 0.72

22 / 50

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

A. median

B. skewness

C. modal

D. mean

23 / 50

23. Primary data is not collected through ___________

A. observations

B. gazettes

C. experiments

D. surveys

24 / 50

24.

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

25 / 50

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

A. Inferential

B. Descriptive

C. Frequency

D. Inductive

26 / 50

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

A. 21

B. 6.5

C. 17

D. 6

27 / 50

27. 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. 55

C. 60

D. 37

28 / 50

28.

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

29 / 50

29.

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

30 / 50

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

A. minimum

B. standard deviation

C. maximum

D. zero

31 / 50

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

A. 1st

B. 4th

C. 2nd

D. 3rd

32 / 50

32. An impossible event has the probability ______

A. 1

B. 0.5

C. 0.25

D. 0

33 / 50

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

A. 0.48

B. 0.67

C. 0.47

D. 0.57

34 / 50

34.

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

35 / 50

35. ____ is not an axiom of probability

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

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

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

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

36 / 50

36.

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

37 / 50

37.

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

38 / 50

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

A. 1

B. 16

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

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

39 / 50

39.

The suitable average for qualitative data is: ________

40 / 50

40.

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

41 / 50

41.

The sum of deviations taken from mean is: _______________

42 / 50

42.

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

43 / 50

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

A. oblong

B. cup

C. octagon

D. bell

44 / 50

44. ____ 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 available on a wide range of subjects

D. They are the most appropriate for any statistical work

45 / 50

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

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

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

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

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

46 / 50

46. _____ is the degree of peakness of a distribution

A. kurtosis

B. symmetry

C. platykurtic

D. variation

47 / 50

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

A. 3.0

B. 4.5

C. 1.0

D. 4.0

48 / 50

48.

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

49 / 50

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

A. determine the number of classes

B. count the number of items

C. distribute

D. tally

50 / 50

50. 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. 25.5

B. 15.5

C. 19.5

D. 10.5

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