# STT205

## Category:STT205

0

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

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1. 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

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2. 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

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

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4.
If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ________



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5.
The frequency distribution of the hourly wage rate of 60 employees of a paper mill is as follows: The mean wage rate is:N______



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

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7.
Given X1=20 and X2=-20. The arithmetic mean will be: ________


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

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

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10.
What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______



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11.
The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________



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12. ______ is not a measure of dispersion

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13.
Step deviation method or coding method is used for computation of the______



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

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

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16.
Sum of absolute deviations of the values is least when deviations are taken from: ________



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

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18.
Scores that differ greatly from the measures of central tendency are called:_________



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19.
Any measure indicating the Centre of a set of data, arranged in an increasing or decreasing order of magnitude, is called a measure of: ______



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

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

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22.
The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:____



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23.
The total of all the observations divided by the number of observations is called: ______



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

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25.
 If the smallest observation in a data is decreased, the average which is not affected is: ____



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26.
The population mean Î¼ is an example of a: _________



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27. 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

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28.
The sum of the squares of the deviations about mean divided by the number of observations is: ________



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

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30. There are 5 different items to be stocked in a store with 3 bins for the storage. What are the possible number of arrangements?

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31. Primary data is not collected through ___________

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

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

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34. ____ is not an advantage of secondary data

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

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

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

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38. The following are examples of discrete random variables except

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

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

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41. _____ is the degree of peakness of a distribution

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

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43.
The median is considered a robust measure because it is resistant to: ________



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44.
The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______


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

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46.
The arithmetic mean is highly affected by: ________



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47.
 If the arithmetic mean of 20 values is 10, then sum of these 20 values is:_____


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48.
Ten families have an average of 2 boys. How many boys do they have together?


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49.
The suitable average for qualitative data is: ________



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50.
 The first step in calculating the median of a discrete variable is to determine the: _______



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