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 following are examples of discrete random variables except

A. Binomial distribution

B. Poisson Distribution

C. Normal Distribution

D. Bernoulli distribution

2 / 50

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

3 / 50

3. An impossible event has the probability ______

A. 0.5

B. 1

C. 0.25

D. 0

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4. ____ 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

5 / 50

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

A. 56.65

B. 56.51

C. 51.56

D. 13.73

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

A. 14

B. 12

C. 3

D. 15

7 / 50

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

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

A. uniquemodal

B. unicmodal

C. singlemodal

D. unimodal

9 / 50

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

10 / 50

10. 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. 6

C. 11

D. 8

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11.

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

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

A. Statistical information in business

B. Micro-statistical information

C. survey designs

D. Macro-statistical information

14 / 50

14. 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

15 / 50

15.

The suitable average for qualitative data is: ________

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16.

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

17 / 50

17.

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

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18.

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

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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. 11

B. 10

C. 20

D. 17

20 / 50

20.

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

21 / 50

21.

The sum of deviations taken from mean is: _______________

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22. 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%

23 / 50

23.

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

24 / 50

24. 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

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25.

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

26 / 50

26.

The arithmetic mean is highly affected by: ________

27 / 50

27.

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

28 / 50

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

A. 0.23

B. 0.72

C. 2.27

D. 5.72

29 / 50

29.

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

30 / 50

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

A. 21

B. 17

C. 6

D. 6.5

31 / 50

31. ____ is not an axiom of probability

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

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

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

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

32 / 50

32. 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. 37

D. 55

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

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

B. 9

C. 7

D. 10

34 / 50

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

35 / 50

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

A. zero

B. maximum

C. minimum

D. standard deviation

36 / 50

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

A. oblong

B. cup

C. bell

D. octagon

37 / 50

37.

The population mean Î¼ is an example of a: _________

38 / 50

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

A. median

B. skewness

C. mean

D. modal

39 / 50

39.

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

40 / 50

40.

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

41 / 50

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

A. 1

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

C. 16

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

42 / 50

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

A. 3rd

B. 2nd

C. 1st

D. 4th

43 / 50

43. 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 as a tool for collecting economic aggregates

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

D. Businesses use statistics to monitor the national economy

44 / 50

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

A. random

B. variable

C. sample

D. population

45 / 50

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

A. 5.01

B. 3.21

C. 4.33

D. 4.21

46 / 50

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

A. Inductive

B. Inferential

C. Frequency

D. Descriptive

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. 1.0

B. 3.0

C. 4.5

D. 4.0

48 / 50

48.

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

49 / 50

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

A. 5.75

B. 5.7

C. 9.7

D. 15.7

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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______

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