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. 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. 0.8825

C. 0.937

D. 0.8625

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

A. zero

B. standard deviation

C. maximum

D. minimum

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

A. 56.51

B. 13.73

C. 51.56

D. 56.65

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

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

A. notation

B. factorial

C. combination

D. permutation

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6. 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. 3.10

B. 3.90

C. 2.90

D. 63%

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

A. unimodal

B. singlemodal

C. unicmodal

D. uniquemodal

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8. 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

9 / 50

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

A. bell

B. cup

C. octagon

D. oblong

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10.

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

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

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

B. 16

C. 1

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

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12.

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

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13. 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

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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: ______

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

A. 1st

B. 2nd

C. 3rd

D. 4th

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16.

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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17.

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

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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. dependent

B. mutually exclusive

C. independent

D. collectively exhaustive

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19.

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

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20.

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

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21.

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

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22. 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. distribute

C. tally

D. count the number of items

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

A. 15

B. 3

C. 14

D. 12

25 / 50

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

A. 18

B. 3

C. 2.5

D. 9

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26.

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

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27.

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

28 / 50

28.

The suitable average for qualitative data is: ________

29 / 50

29.

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

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30.

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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31.

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

32 / 50

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

A. Frequency

B. Inferential

C. Inductive

D. Descriptive

33 / 50

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

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

B. Businesses use statistics to monitor the national economy

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

D. Government uses statistics only for census

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34.

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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35.

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

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36. 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. 4.0

D. 4.5

37 / 50

37. ____ is not an advantage of secondary data

A. They can be used to establish trends for forecasting

B. They are the most appropriate for any statistical work

C. They are available on a wide range of subjects

D. They are inexpensive to collect

38 / 50

38. ______ is not a measure of dispersion

A. coefficient of variation

B. standard deviation

C. mean

D. variance

39 / 50

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

A. Macro-statistical information

B. survey designs

C. Statistical information in business

D. Micro-statistical information

40 / 50

40. The following are examples of discrete random variables except

A. Bernoulli distribution

B. Poisson Distribution

C. Binomial distribution

D. Normal Distribution

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41. 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. 8

B. 7

C. 6

D. 11

42 / 50

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

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

B. 9

C. 10

D. 7

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43.

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

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44.

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

45 / 50

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

A. median

B. mean

C. skewness

D. modal

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46.

The arithmetic mean is highly affected by: ________

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47.

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

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48. Calculate 70% of the mean of the set of data in the table below

A. 42.5

B. 29.75

C. 2.975

D. 4.25

49 / 50

49. Primary data is not collected through ___________

A. observations

B. gazettes

C. surveys

D. experiments

50 / 50

50.

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

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