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: ______ Answer: Central tendency FBQ2: Scores that differ greatly from the measures of central tendency are called:_________ Answer: Outliers FBQ3: The total of all the observations divided by the number of observations is called: ______ Answer: Arithmetic mean FBQ4: The sample mean X- is an example of a: ________________ Answer: Statistic FBQ5: The population mean μ is an example of a: Answer: Parameter FBQ6: The arithmetic mean is highly affected by: ________ Answer: Extreme values FBQ7: If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ________ Answer: Increased by the constant FBQ8: The median is considered a robust measure because it is resistant to: ________ Answer: Outliers FBQ9: What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______ Answer: Increase the mean FBQ10: The elimination of extreme scores at the top of the set has the effect of: Answer: Reduce the mean FBQ11: The sum of deviations taken from mean is: _______________ Answer: 0 FBQ12: The sum of the squares of the deviations about mean divided by the number of observations is: ________ Answer: Variance FBQ13: If ∑i=110Xi-50=100 then sample mean X- will be: ________ Answer: 60 FBQ14: For a certain distribution, if ∑(X -20) = 25,   ∑(X- 25) =0, and ∑(X-35) = -25, then X- is equal to: Answer: 25 FBQ15: The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________ Answer: Arithmetic mean FBQ16: If X-=100 and Y=2X – 200, then mean of Y values will be: _______ Answer: 0 FBQ17: Step deviation method or coding method is used for computation of the______ Answer: Arithmetic mean FBQ18: If the arithmetic mean of 20 values is 10, then sum of these 20 values is:_____ Answer: 200 FBQ19: Ten families have an average of 2 boys. How many boys do they have together? Answer: 20 FBQ20: If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:_________ Answer: 7 FBQ21: Given X1=20 and X2=-20. The arithmetic mean will be: ________ Answer: 0 FBQ22: The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______ Answer: 11 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______ Answer: 59.00 FBQ24: The sample mean X- of first n natural numbers is: ________   Answer: (n+1)/2 FBQ25: The sum of deviations is zero when deviations are taken from:________ Answer: Mean FBQ26: When the values in a series are not of equal importance, we calculate the: _____________ Answer: Weighted mean FBQ27: When all the values in a series occur the equal number of times, then it is not possible to calculate the:__________ Answer: Weighted mean 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:_______ Answer: Weighted mean FBQ29: The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: ______ Answer: 6 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:____ Answer: Median FBQ31: The first step in calculating the median of a discrete variable is to determine the: _______ Answer: Array FBQ32: The suitable average for qualitative data is: ________ Answer: Median FBQ33: If the smallest observation in a data is decreased, the average which is not affected is: ____ Answer: Median FBQ34: Sum of absolute deviations of the values is least when deviations are taken from: ________ Answer: Median 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 ____ Answer: 59.00 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: Answer: quartiles MCQ2: The lower and upper quartiles of a symmetrical distribution are 40 and 60 respectively. The value of median is: Answer: 50 MCQ3: If in a discrete series 75% values are less than 30, then: Answer: Third quartile =30 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). Answer: 35/18 MCQ5: The mean of first 2n natural numbers is: Answer: (2n+1)/2 MCQ6: If X-1, X-2, X-3,….X-k be the arithmetic means of k distributions with respective frequencies n1, n2, n3, … ,nk, then the mean of the whole distribution X-c is given by: Answer: ∑nX-∑n MCQ7: The combined arithmetic mean of two sets of means is calculated by which formula? Answer: n1X-1+n2 X-2n1+n2 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?  Answer: 2.11 MCQ10: The grouped frequency distribution shown below is to be used to answer the following questionWhich class is the modal class? Answer: 20 - 24 MCQ11: The grouped frequency distribution shown below is to be used to answer the following questionWhich class is the median class? Answer: 20 - 24 MCQ12: The grouped frequency distribution shown below is to be used to answer the following questionWhat is the cumulative frequency of the modal class? Answer: 14 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 åx is, Answer: 1600 MCQ15: The mean of 63, 19, 52, 10, 95, 18 is Answer: 42.83 MCQ16: The median of 63, 19, 52, 10, 95, 18 is Answer: 35.5 MCQ17: The mode and the range of the above data are Answer: 40, 40 MCQ18: The geometric mean of 6, 8, 10 and 16 is Answer: 9.36 MCQ19: The harmonic mean of 6, 7, 8 and 9 is Answer: 7.33 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 Answer: 0.4 MCQ21: A set of sales from an outlet produced the following: 16, 14, 18, 10, 12 compute the variance Answer: 8 MCQ22: The coefficient of variation for data set whose mean is 10 and variance 100 is Answer: 100% 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? Answer: The arithmetic mean MCQ25: How would you describe the skewness of a distribution whose mean is smaller than the median? Answer: Negatively skewed MCQ26: What level of measurement is required for the median? Answer: ordinal 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 Answer: Geometric mean 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? Answer: symmetric 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: Answer: 0.4 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: Answer: 8 MCQ31: The coefficient of variation for data set whose mean is 16 and variance 10 is Answer: 19.8 MCQ32: Given the mean = 60 and variance is 625, find the coefficient of variation Answer: 41.7% MCQ33: Suppose A and B are independent events with PA=0.2, PB=0.6..What is PAB=? Answer: 0.2 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? Answer: 144 degree MCQ35: The data collected by questionnaires are usually classified as what type of data? Answer: Primary data