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 suitable average for qualitative data is: ________

2 / 50

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

A. 9

B. 7

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

D. 10

3 / 50

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

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

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

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

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

4 / 50

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

A. 14

B. 12

C. 15

D. 3

5 / 50

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

A. standard deviation

B. zero

C. maximum

D. minimum

6 / 50

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

7 / 50

7. 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

8 / 50

The population mean Î¼ is an example of a: _________

9 / 50

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

10 / 50

10.

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

11 / 50

11.

The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:____

12 / 50

12.

The sum of deviations taken from mean is: _______________

13 / 50

13. 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. 0.8625

C. 0.937

D. 0.8825

14 / 50

14. The addition rule of probability is used for ___ events

A. mutually exclusive

B. independent

C. dependent

D. mutually inclusive

15 / 50

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

A. 21

B. 6.5

C. 17

D. 6

16 / 50

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______

17 / 50

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

A. 3rd

B. 1st

C. 4th

D. 2nd

18 / 50

18.

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

19 / 50

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

A. 9.7

B. 15.7

C. 5.75

D. 5.7

20 / 50

20.

The arithmetic mean is highly affected by: ________

21 / 50

21. 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%

22 / 50

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

A. 0.72

B. 5.72

C. 0.23

D. 2.27

23 / 50

23. Primary data is not collected through ___________

A. experiments

B. gazettes

C. surveys

D. observations

24 / 50

24.

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

25 / 50

25. ____ is not an axiom of probability

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

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

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

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

26 / 50

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

A. maximum

B. zero

C. minimum

D. standard deviation

27 / 50

27. 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. 6

B. 7

C. 8

D. 11

28 / 50

28. 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

29 / 50

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

A. 56.65

B. 13.73

C. 51.56

D. 56.51

30 / 50

30.

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

31 / 50

31.

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

32 / 50

32. 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. 10.5

D. 19.5

33 / 50

33. 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. 55

B. 37

C. 60

D. 36

34 / 50

34.

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

35 / 50

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

A. skewness

B. mean

C. median

D. modal

36 / 50

36.

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

37 / 50

37. _____ is the degree of peakness of a distribution

A. platykurtic

B. symmetry

C. variation

D. kurtosis

38 / 50

38.

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

39 / 50

39.

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

40 / 50

40. 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

41 / 50

41.

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

42 / 50

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

A. 9

B. 18

C. 3

D. 2.5

43 / 50

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

A. 2.975

B. 29.75

C. 4.25

D. 42.5

44 / 50

44. 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

45 / 50

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

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

B. 1

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

D. 16

46 / 50

46.

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

47 / 50

47.

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

48 / 50

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

A. Frequency

B. Descriptive

C. Inferential

D. Inductive

49 / 50

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

A. octagon

B. cup

C. bell

D. oblong

50 / 50

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

A. count the number of items

B. determine the number of classes

C. distribute

D. tally

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