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 addition rule of probability is used for ___ events

A. mutually inclusive

B. independent

C. mutually exclusive

D. dependent

2 / 50

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

A. variable

B. random

C. population

D. sample

3 / 50

3. 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. 11

B. 10

C. 17

D. 20

4 / 50

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

A. zero

B. minimum

C. standard deviation

D. maximum

5 / 50

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

A. 2.5

B. 18

C. 9

D. 3

6 / 50

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

7 / 50

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

A. modal

B. mean

C. skewness

D. median

8 / 50

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

9 / 50

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

A. survey designs

B. Statistical information in business

C. Macro-statistical information

D. Micro-statistical information

10 / 50

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

A. 6

B. 21

C. 17

D. 6.5

11 / 50

11. 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. 60

B. 36

C. 55

D. 37

12 / 50

12.

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

13 / 50

13.

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

14 / 50

14.

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

15 / 50

15. 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

16 / 50

16.

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

17 / 50

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

A. 5.72

B. 2.27

C. 0.23

D. 0.72

18 / 50

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

A. maximum

B. standard deviation

C. minimum

D. zero

19 / 50

19. Primary data is not collected through ___________

A. surveys

B. observations

C. gazettes

D. experiments

20 / 50

20.

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

21 / 50

21. ____ is not an advantage of secondary data

A. They are inexpensive to collect

B. They can be used to establish trends for forecasting

C. They are the most appropriate for any statistical work

D. They are available on a wide range of subjects

22 / 50

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

A. 14

B. 12

C. 3

D. 15

23 / 50

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

A. 3rd

B. 1st

C. 4th

D. 2nd

24 / 50

24.

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

25 / 50

25.

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

26 / 50

26.

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

27 / 50

27.

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

28 / 50

28. _____ is the degree of peakness of a distribution

A. symmetry

B. variation

C. platykurtic

D. kurtosis

29 / 50

29.

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

30 / 50

30.

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

31 / 50

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

A. 5.01

B. 4.21

C. 4.33

D. 3.21

32 / 50

32. 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. 3.10

C. 3.90

D. 63%

33 / 50

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

A. notation

B. permutation

C. factorial

D. combination

34 / 50

34.

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

35 / 50

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

A. oblong

B. octagon

C. cup

D. bell

36 / 50

36. 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 to measure the effect of external factors on its policies

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

37 / 50

37.

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

38 / 50

38.

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

39 / 50

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

A. 5.7

B. 15.7

C. 5.75

D. 9.7

40 / 50

40. An impossible event has the probability ______

A. 0.5

B. 0.25

C. 0

D. 1

41 / 50

41. 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

42 / 50

42.

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

43 / 50

43.

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

44 / 50

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

A. tally

B. distribute

C. count the number of items

D. determine the number of classes

45 / 50

45. The following are examples of discrete random variables except

A. Bernoulli distribution

B. Poisson Distribution

C. Binomial distribution

D. Normal Distribution

46 / 50

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

A. 0.67

B. 0.57

C. 0.48

D. 0.47

47 / 50

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

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

B. 9

C. 10

D. 7

48 / 50

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

A. independent

B. collectively exhaustive

C. dependent

D. mutually exclusive

49 / 50

49. ____ is not an axiom of probability

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

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

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

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

50 / 50

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

A. unimodal

B. unicmodal

C. uniquemodal

D. singlemodal

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