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

The sum of deviations taken from mean is: _______________

2 / 50

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

A. 4.25

B. 42.5

C. 2.975

D. 29.75

3 / 50

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

4 / 50

4. 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. 37

D. 60

5 / 50

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

A. unicmodal

B. unimodal

C. uniquemodal

D. singlemodal

6 / 50

6. 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

7 / 50

7. The following are examples of discrete random variables except

A. Normal Distribution

B. Poisson Distribution

C. Bernoulli distribution

D. Binomial distribution

8 / 50

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

A. Government uses statistics only for census

B. Businesses use statistics to monitor the national economy

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

9 / 50

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

A. skewness

B. mean

C. median

D. modal

10 / 50

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

A. bell

B. octagon

C. cup

D. oblong

11 / 50

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

A. combination

B. factorial

C. notation

D. permutation

12 / 50

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

A. 4.33

B. 3.21

C. 4.21

D. 5.01

13 / 50

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

A. Inductive

B. Descriptive

C. Frequency

D. Inferential

14 / 50

14.

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

15 / 50

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

A. maximum

B. zero

C. standard deviation

D. minimum

16 / 50

16. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They can be used to establish trends for forecasting

C. They are available on a wide range of subjects

D. They are inexpensive to collect

17 / 50

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

A. 6.5

B. 6

C. 17

D. 21

18 / 50

18.

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

19 / 50

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

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

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

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

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

20 / 50

20. ____ is not an axiom of probability

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

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

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

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

21 / 50

21.

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

22 / 50

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

A. distribute

B. determine the number of classes

C. count the number of items

D. tally

23 / 50

23.

The suitable average for qualitative data is: ________

24 / 50

24.

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

25 / 50

25.

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

26 / 50

26. 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. 17

C. 10

D. 20

27 / 50

27.

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

28 / 50

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

A. 9

B. 10

C. 7

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

29 / 50

29. _____ is the degree of peakness of a distribution

A. symmetry

B. platykurtic

C. variation

D. kurtosis

30 / 50

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

A. 2nd

B. 3rd

C. 4th

D. 1st

31 / 50

31.

Scores that differ greatly from the measures of central tendency are called:_________

32 / 50

32.

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

33 / 50

33.

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

34 / 50

34.

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

35 / 50

35.

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

36 / 50

36.

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

37 / 50

37. ______ is not a measure of dispersion

A. standard deviation

B. variance

C. coefficient of variation

D. mean

38 / 50

38.

The arithmetic mean is highly affected by: ________

39 / 50

39.

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

40 / 50

40. An impossible event has the probability ______

A. 0.25

B. 1

C. 0.5

D. 0

41 / 50

41.

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

42 / 50

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

A. 3

B. 15

C. 12

D. 14

43 / 50

43.

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

44 / 50

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

A. independent

B. dependent

C. mutually exclusive

D. collectively exhaustive

45 / 50

45. 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. 63%

D. 3.90

46 / 50

46.

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

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. 4.5

B. 3.0

C. 4.0

D. 1.0

48 / 50

48. Primary data is not collected through ___________

A. experiments

B. observations

C. surveys

D. gazettes

49 / 50

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

A. 15.7

B. 9.7

C. 5.75

D. 5.7

50 / 50

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

A. 18

B. 2.5

C. 9

D. 3

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