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. 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

2 / 50

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

3 / 50

The arithmetic mean is highly affected by: ________

4 / 50

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

5 / 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:____

6 / 50

6. 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

7 / 50

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

A. survey designs

B. Statistical information in business

C. Micro-statistical information

D. Macro-statistical information

8 / 50

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

9 / 50

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

A. 0.57

B. 0.47

C. 0.67

D. 0.48

10 / 50

10. 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

11 / 50

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

A. 5.72

B. 0.72

C. 2.27

D. 0.23

12 / 50

12. _____ is the degree of peakness of a distribution

A. symmetry

B. kurtosis

C. variation

D. platykurtic

13 / 50

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

A. variable

B. random

C. sample

D. population

14 / 50

14. ____ is not an advantage of secondary data

A. They can be used to establish trends for forecasting

B. They are inexpensive to collect

C. They are the most appropriate for any statistical work

D. They are available on a wide range of subjects

15 / 50

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

A. 4.21

B. 3.21

C. 5.01

D. 4.33

16 / 50

16.

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

17 / 50

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

A. uniquemodal

B. unicmodal

C. unimodal

D. singlemodal

18 / 50

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

A. 56.51

B. 13.73

C. 56.65

D. 51.56

19 / 50

19.

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

20 / 50

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

A. 2nd

B. 1st

C. 3rd

D. 4th

21 / 50

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

A. modal

B. median

C. skewness

D. mean

22 / 50

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

A. 12

B. 14

C. 15

D. 3

23 / 50

23.

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

24 / 50

24. ____ is not an axiom of probability

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

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

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

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

25 / 50

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

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

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

C. 1

D. 16

26 / 50

26.

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

27 / 50

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

A. 21

B. 17

C. 6.5

D. 6

28 / 50

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

A. Inductive

B. Frequency

C. Descriptive

D. Inferential

29 / 50

29.

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

30 / 50

30.

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

31 / 50

31.

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

32 / 50

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

A. 5.7

B. 9.7

C. 5.75

D. 15.7

33 / 50

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

A. dependent

B. mutually exclusive

C. mutually inclusive

D. independent

34 / 50

34. 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. 3.90

C. 3.10

D. 63%

35 / 50

35.

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

36 / 50

36.

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

37 / 50

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

A. distribute

B. count the number of items

C. determine the number of classes

D. tally

38 / 50

38. The following are examples of discrete random variables except

A. Poisson Distribution

B. Bernoulli distribution

C. Normal Distribution

D. Binomial distribution

39 / 50

39. 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. 25.5

C. 19.5

D. 10.5

40 / 50

40. Primary data is not collected through ___________

A. gazettes

B. observations

C. surveys

D. experiments

41 / 50

41.

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

42 / 50

42. 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. 11

C. 7

D. 8

43 / 50

43.

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

44 / 50

44.

The population mean Î¼ is an example of a: _________

45 / 50

45.

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

46 / 50

46. ______ is not a measure of dispersion

A. coefficient of variation

B. variance

C. mean

D. standard deviation

47 / 50

47. 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. 60

B. 55

C. 37

D. 36

48 / 50

48.

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

49 / 50

49.

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

50 / 50

50. 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

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