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. Primary data is not collected through ___________

A. observations

B. surveys

C. experiments

D. gazettes

2 / 50

2. 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. 0.23

D. 5.72

3 / 50

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

A. 15

B. 12

C. 3

D. 14

4 / 50

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

5 / 50

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

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

D. Businesses use statistics to monitor the national economy

6 / 50

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

7 / 50

7. 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

8 / 50

8. 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

9 / 50

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

10 / 50

10. A characteristics that assumes different values for different entities is called __________________

A. variable

B. random

C. population

D. sample

11 / 50

11. 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. 8

C. 6

D. 11

12 / 50

12.

The population mean Î¼ is an example of a: _________

13 / 50

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

A. cup

B. bell

C. octagon

D. oblong

14 / 50

14.

The frequency distribution of the hourly wage rate of 60 employees of a paper mill is as follows: The mean wage rate is:N______

15 / 50

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

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

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

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

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

16 / 50

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

A. 9

B. 3

C. 18

D. 2.5

17 / 50

17. ____ 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

18 / 50

18.

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

19 / 50

19.

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

20 / 50

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

A. Macro-statistical information

B. Statistical information in business

C. survey designs

D. Micro-statistical information

21 / 50

21.

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

22 / 50

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

A. mean

B. modal

C. median

D. skewness

23 / 50

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

A. maximum

B. standard deviation

C. minimum

D. zero

24 / 50

24. 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. 1.0

C. 3.0

D. 4.5

25 / 50

25.

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

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. 10

B. 17

C. 20

D. 11

27 / 50

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

A. notation

B. combination

C. factorial

D. permutation

28 / 50

28.

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

29 / 50

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

A. Inferential

B. Inductive

C. Descriptive

D. Frequency

30 / 50

30.

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

31 / 50

31. 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. 3.90

B. 3.10

C. 63%

D. 2.90

32 / 50

32.

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

33 / 50

33.

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

34 / 50

34. The following are examples of discrete random variables except

A. Binomial distribution

B. Normal Distribution

C. Poisson Distribution

D. Bernoulli distribution

35 / 50

35.

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

36 / 50

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

A. 13.73

B. 56.65

C. 51.56

D. 56.51

37 / 50

37.

The sum of deviations taken from mean is: _______________

38 / 50

38.

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

39 / 50

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

A. 0.48

B. 0.67

C. 0.47

D. 0.57

40 / 50

40.

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

41 / 50

41. 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. 19.5

C. 10.5

D. 15.5

42 / 50

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

A. 5.75

B. 5.7

C. 15.7

D. 9.7

43 / 50

43.

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

44 / 50

44. An impossible event has the probability ______

A. 0

B. 1

C. 0.5

D. 0.25

45 / 50

45.

The arithmetic mean is highly affected by: ________

46 / 50

46. 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

47 / 50

47.

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

48 / 50

48.

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

49 / 50

49.

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

50 / 50

50.

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

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