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. ______ is not a measure of dispersion

A. variance

B. mean

C. coefficient of variation

D. standard deviation

3 / 50

3. 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. 25.5

D. 10.5

4 / 50

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

A. 3

B. 2.5

C. 18

D. 9

5 / 50

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

6 / 50

The population mean Î¼ is an example of a: _________

7 / 50

7. 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. 1.0

D. 4.0

8 / 50

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

9 / 50

9. ____ is not an axiom of probability

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

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

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

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

10 / 50

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

A. dependent

B. mutually inclusive

C. independent

D. mutually exclusive

11 / 50

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

A. median

B. skewness

C. mean

D. modal

12 / 50

12.

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

13 / 50

13.

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

14 / 50

14. 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

15 / 50

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

A. 2nd

B. 1st

C. 3rd

D. 4th

16 / 50

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

A. 5.7

B. 15.7

C. 5.75

D. 9.7

17 / 50

17.

The suitable average for qualitative data is: ________

18 / 50

18. The following are examples of discrete random variables except

A. Binomial distribution

B. Bernoulli distribution

C. Normal Distribution

D. Poisson Distribution

19 / 50

19. 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

20 / 50

20.

The arithmetic mean is highly affected by: ________

21 / 50

21.

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

22 / 50

22.

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

23 / 50

23.

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

24 / 50

24.

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

25 / 50

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

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

B. 1

C. 16

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

26 / 50

26. Primary data is not collected through ___________

A. surveys

B. experiments

C. gazettes

D. observations

27 / 50

27. ____ 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

28 / 50

28.

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

29 / 50

29.

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

30 / 50

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

A. combination

B. factorial

C. permutation

D. notation

31 / 50

31.

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

32 / 50

32.

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

33 / 50

33.

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

34 / 50

34.

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

35 / 50

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

A. unicmodal

B. singlemodal

C. uniquemodal

D. unimodal

36 / 50

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

A. 2.975

B. 29.75

C. 42.5

D. 4.25

37 / 50

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

A. 3

B. 12

C. 15

D. 14

38 / 50

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

A. 3.21

B. 5.01

C. 4.21

D. 4.33

39 / 50

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

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

B. 10

C. 9

D. 7

40 / 50

40.

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

41 / 50

41. 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. 2.27

D. 0.23

42 / 50

42.

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

43 / 50

43. 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. 37

C. 55

D. 60

44 / 50

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

A. 6.5

B. 17

C. 21

D. 6

45 / 50

45.

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

46 / 50

46.

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

47 / 50

47. An impossible event has the probability ______

A. 1

B. 0

C. 0.5

D. 0.25

48 / 50

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

C. Government uses statistics only for census

D. Businesses use statistics to monitor the national economy

49 / 50

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

A. Micro-statistical information

B. Macro-statistical information

C. Statistical information in business

D. survey designs

50 / 50

50. 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. count the number of items

C. distribute

D. tally

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