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

2 / 50

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

A. unicmodal

B. singlemodal

C. uniquemodal

D. unimodal

3 / 50

3. 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. 20

C. 11

D. 17

4 / 50

4. _____ is the degree of peakness of a distribution

A. platykurtic

B. kurtosis

C. variation

D. symmetry

5 / 50

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

A. 14

B. 3

C. 12

D. 15

6 / 50

6. Which of the following statement does not represent a role of statistics in the society?

A. Businesses use statistics to monitor the national economy

B. Government uses statistics only for census

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

7 / 50

7. 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. 60

D. 55

8 / 50

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

A. 6.5

B. 17

C. 21

D. 6

9 / 50

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

10 / 50

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

A. 13.73

B. 51.56

C. 56.65

D. 56.51

11 / 50

11.

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

12 / 50

12.

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

13 / 50

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

A. 9

B. 7

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

D. 10

14 / 50

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

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

15 / 50

15.

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

16 / 50

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

A. zero

B. minimum

C. maximum

D. standard deviation

17 / 50

17.

The population mean Î¼ is an example of a: _________

18 / 50

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

A. standard deviation

B. minimum

C. zero

D. maximum

19 / 50

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

A. 0.72

B. 0.23

C. 2.27

D. 5.72

20 / 50

20.

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

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 the following is not a source of data?

A. Macro-statistical information

B. Statistical information in business

C. survey designs

D. Micro-statistical information

23 / 50

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

A. 2.975

B. 42.5

C. 29.75

D. 4.25

24 / 50

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

A. combination

B. permutation

C. factorial

D. notation

25 / 50

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

A. octagon

B. cup

C. bell

D. oblong

26 / 50

26. The following are examples of discrete random variables except

A. Normal Distribution

B. Bernoulli distribution

C. Binomial distribution

D. Poisson Distribution

27 / 50

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

A. skewness

B. mean

C. median

D. modal

28 / 50

28.

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

29 / 50

29. The empirical relationship between the mean and median is given by; mean �?? mode = x(mean �?? median) in the table below . Then x is _________________

A. 3.0

B. 1.0

C. 4.0

D. 4.5

30 / 50

30.

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

31 / 50

31. 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. 10.5

C. 15.5

D. 19.5

32 / 50

32.

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

33 / 50

33.

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

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. 3.90

B. 63%

C. 3.10

D. 2.90

35 / 50

35. 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

36 / 50

36. 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

37 / 50

37.

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

38 / 50

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

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

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

C. 1

D. 16

39 / 50

39. 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. tally

D. distribute

40 / 50

40. ____ is not an advantage of secondary data

A. They are inexpensive to collect

B. They are the most appropriate for any statistical work

C. They are available on a wide range of subjects

D. They can be used to establish trends for forecasting

41 / 50

41.

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

42 / 50

42.

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

43 / 50

43.

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

44 / 50

44. ______ is not a measure of dispersion

A. standard deviation

B. mean

C. coefficient of variation

D. variance

45 / 50

45.

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

46 / 50

46.

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

47 / 50

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

A. 4.33

B. 4.21

C. 5.01

D. 3.21

48 / 50

48. ____ is not an axiom of probability

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

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

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

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

49 / 50

49.

When the values in a series are not of equal importance, we calculate the: _____________

50 / 50

50. 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. 0.937

B. 0.8825

C. 0.8625

D. 0.9

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