## NOUN eExams Past Questions & Answers: -STT205 - Statistics for Management Sciences I

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### NOUN eExams Past Questions & Answers: -STT205 - Statistics for Management Sciences I

NOUN eExams Past Questions & Answers: -STT205 - Statistics for Management Sciences I

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FBQ1: Any measure indicating the Centre of a set of data, arranged in an increasing or decreasing order of magnitude, is called a measure of: __

FBQ2: Scores that differ greatly from the measures of central tendency are called:___

FBQ3: The total of all the observations divided by the number of observations is called: __

FBQ4: The sample mean X- is an example of a: ______

FBQ5: The population mean Î¼ is an example of a:

FBQ6: The arithmetic mean is highly affected by: ____

FBQ7: If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ____

FBQ8: The median is considered a robust measure because it is resistant to: ____

FBQ9: What effect will the elimination of extreme scores at the bottom of a data set have on the mean? __

FBQ10: The elimination of extreme scores at the top of the set has the effect of:

FBQ11: The sum of deviations taken from mean is: _____

FBQ12: The sum of the squares of the deviations about mean divided by the number of observations is: ____

FBQ13: If âˆ‘i=110Xi-50=100 then sample mean X- will be: ____

FBQ14: For a certain distribution, if âˆ‘(XÂ -20)Â =Â 25,Â Â Â âˆ‘(X-Â 25)Â =0, and âˆ‘(X-35)Â =Â -25, then X- is equal to:

FBQ15: 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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### Re: NOUN eExams Past Questions & Answers: -STT205 - Statistics for Management Sciences I

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FBQ16: If X-=100 and Y=2XÂ â€“Â 200, then mean of Y values will be: ___

FBQ17: Step deviation method or coding method is used for computation of the____

FBQ18: If the arithmetic mean of 20 values is 10, then sum of these 20 values is:___

FBQ19: Ten families have an average of 2 boys. How many boys do they have together?

FBQ20: If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:___

FBQ21: Given X1=20 and X2=-20. The arithmetic mean will be: ____

FBQ22: The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: __

FBQ23: The frequency distribution of the hourly wage rate of 60 employees of a paper mill is as follows: The mean wage rate is:N____

FBQ24: The sample mean X- of first n natural numbers is: ____ Â

FBQ25: The sum of deviations is zero when deviations are taken from:____

FBQ26: When the values in a series are not of equal importance, we calculate the: _____

FBQ27: When all the values in a series occur the equal number of times, then it is not possible to calculate the:____

FBQ28: The mean for a set of data obtained by assigning each data value a weight that reflects its relative importance within the set, is called:___

FBQ29: The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: __

FBQ30: The midpoint of the values after they have been ordered from the smallest to the largest or the largest to the smallest is called:__

FBQ31: The first step in calculating the median of a discrete variable is to determine the: ___

FBQ32: The suitable average for qualitative data is: ____

FBQ33: If the smallest observation in a data is decreased, the average which is not affected is: __

FBQ34: Sum of absolute deviations of the values is least when deviations are taken from: ____

FBQ35: The frequency distribution of the hourly wages rate of 100 employees of a paper mill is as follows: The median wage rate is:N __

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### Re: NOUN eExams Past Questions & Answers: -STT205 - Statistics for Management Sciences I

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MCQ1: The values of the variate that divide a set of data into four equal parts after arranging the observations in ascending order of magnitude are called:

MCQ2: The lower and upper quartiles of a symmetrical distribution are 40 and 60 respectively. The value of median is:

MCQ3: If in a discrete series 75% values are less than 30, then:

MCQ4: The probability of the amount X (in million Naira) of investment in the shares of ABC Company is given as follows:Find E (X).

MCQ5: The mean of first 2n natural numbers is:

MCQ6: If X-1,Â X-2,Â X-3,â€¦.X-k be the arithmetic means of k distributions with respective frequencies n1,Â n2,Â n3,Â â€¦Â ,nk, then the mean of the whole distribution X-c is given by:

MCQ7: The combined arithmetic mean of two sets of means is calculated by which formula?

MCQ8: Extreme scores will have the following effect on the median of an examination
Answer: They may have no effect

MCQ9: The probability of the amount X (in million Naira) of investment in the shares of ABC Company of Adewale is given as follows:E(X2). is actually 5.89. What is the variance of X?Â

MCQ10: The grouped frequency distribution shown below is to be used to answer the following questionWhich class is the modal class?

MCQ11: The grouped frequency distribution shown below is to be used to answer the following questionWhich class is the median class?

MCQ12: The grouped frequency distribution shown below is to be used to answer the following questionWhat is the cumulative frequency of the modal class?

MCQ13: For a standard normal distribution, what is the values of the mean and variance?
Answer: Mean = 0, variance = 1

MCQ14: Given the set of numbers: 15, 16, 12, 11, 19, 18, 13 then Ã¥x is,

MCQ15: The mean of 63, 19, 52, 10, 95, 18 is

MCQ16: The median of 63, 19, 52, 10, 95, 18 is

MCQ17: The mode and the range of the above data are

MCQ18: The geometric mean of 6, 8, 10 and 16 is

MCQ19: The harmonic mean of 6, 7, 8 and 9 is

MCQ20: Given that the mean of a distribution is 160, the mode is 150 and the standard deviation is 25. Find the coefficient of skewness

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### Re: NOUN eExams Past Questions & Answers: -STT205 - Statistics for Management Sciences I

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MCQ21: A set of sales from an outlet produced the following: 16, 14, 18, 10, 12 compute the variance

MCQ22: The coefficient of variation for data set whose mean is 10 and variance 100 is

MCQ23: For a symmetric distribution
Answer: The mean, median and the mode are equal

MCQ24: Which statistics is found by summing all the values and dividing by the number of observations?

MCQ25: How would you describe the skewness of a distribution whose mean is smaller than the median?

MCQ26: What level of measurement is required for the median?

MCQ27: The Nigeria Stock Exchange (NSE) index increased from 961 in 1980 to over 9,500 in 2003. The annual rate of increase is best described by the

MCQ28: What is the shape of a frequency distribution with an arithmetic mean of 12,000 pounds, a median of 12,000 pounds, and a mode of 12,000 pounds?

MCQ29: Given that the mean of a distribution is 60, the mode is 50 and the standard deviation is 25. Find the coefficient of skewness:

MCQ30: A set of experimental animals was fed in a special diet for one week and produced the following gains in weight: 6, 4, 8, 10, 12 compute the variance:

MCQ31: The coefficient of variation for data set whose mean is 16 and variance 10 is

MCQ32: Given the mean = 60 and variance is 625, find the coefficient of variation

MCQ33: Suppose A and B are independent events with PA=0.2,Â PB=0.6..What is PAB=?

MCQ34: In a shipping organization, it is observed that the total number of items imported is 400 units. If you are to categorise these items into types of commodity with the aid of a pie chart, what angle would 160 units of chemical take?