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

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

3 / 50

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

A. 56.51

B. 56.65

C. 13.73

D. 51.56

4 / 50

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

A. 10

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

C. 9

D. 7

5 / 50

5. 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. 15.5

B. 19.5

C. 10.5

D. 25.5

6 / 50

6. 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

7 / 50

7. 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. 20

B. 10

C. 11

D. 17

8 / 50

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

A. uniquemodal

B. unicmodal

C. unimodal

D. singlemodal

9 / 50

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

A. 17

B. 21

C. 6

D. 6.5

10 / 50

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

A. 0.23

B. 2.27

C. 0.72

D. 5.72

11 / 50

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

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

12 / 50

12.

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

13 / 50

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

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

B. 1

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

D. 16

14 / 50

14. An impossible event has the probability ______

A. 0.5

B. 1

C. 0.25

D. 0

15 / 50

15.

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

16 / 50

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

A. Micro-statistical information

B. Macro-statistical information

C. survey designs

D. Statistical information in business

17 / 50

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

A. 4th

B. 2nd

C. 3rd

D. 1st

18 / 50

18. 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

19 / 50

19. The following are examples of discrete random variables except

A. Binomial distribution

B. Bernoulli distribution

C. Poisson Distribution

D. Normal Distribution

20 / 50

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

A. 29.75

B. 42.5

C. 2.975

D. 4.25

21 / 50

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

A. 9.7

B. 5.75

C. 5.7

D. 15.7

22 / 50

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

A. tally

B. count the number of items

C. determine the number of classes

D. distribute

23 / 50

23.

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

24 / 50

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

A. maximum

B. standard deviation

C. zero

D. minimum

25 / 50

25.

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

26 / 50

26.

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

27 / 50

27.

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

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. Find the number of students that offer all subjects

A. 7

B. 11

C. 6

D. 8

29 / 50

29.

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

30 / 50

30. 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. 0.8825

B. 0.8625

C. 0.937

D. 0.9

31 / 50

31. 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. 37

B. 60

C. 55

D. 36

32 / 50

32. ____ is not an advantage of secondary data

A. They are the most appropriate for any statistical work

B. They are available on a wide range of subjects

C. They can be used to establish trends for forecasting

D. They are inexpensive to collect

33 / 50

33.

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

34 / 50

34.

The population mean Î¼ is an example of a: _________

35 / 50

35.

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

36 / 50

36. 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%

37 / 50

37.

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

38 / 50

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

A. dependent

B. collectively exhaustive

C. mutually exclusive

D. independent

39 / 50

39. _____ is the degree of peakness of a distribution

A. kurtosis

B. platykurtic

C. variation

D. symmetry

40 / 50

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

A. 0.57

B. 0.67

C. 0.48

D. 0.47

41 / 50

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

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

42 / 50

42. ____ is not an axiom of probability

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

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

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

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

43 / 50

43.

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

44 / 50

44.

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

45 / 50

45. 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

46 / 50

46.

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

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. 4.0

B. 4.5

C. 1.0

D. 3.0

48 / 50

48. ______ is not a measure of dispersion

A. mean

B. standard deviation

C. coefficient of variation

D. variance

49 / 50

49.

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

50 / 50

50.

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

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