Default for STT205 The default category for questions shared in context 'STT205'. Fill in the Blank (FBQs) 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: ______ *Central tendency* 1.0000000 0.0000000 FBQ2 Scores that differ greatly from the measures of central tendency are called:_________ *Outliers* 1.0000000 *Extreme values* 1.0000000 *Extreme scores* 1.0000000 FBQ3 The total of all the observations divided by the number of observations is called: ______ *Arithmetic mean* 1.0000000 0.0000000 FBQ4 The sample mean is an example of a: ________________ *Statistic* 1.0000000 0.0000000 FBQ5 The population mean μ is an example of a: *Parameter* 1.0000000 0.0000000 FBQ6 The arithmetic mean is highly affected by: ________ *Extreme values* 1.0000000 *Outliers* 1.0000000 FBQ7 If a constant value is added to every observation of data, how would the value of the arithmetic mean behave? ________ *Increased by the constant* 1.0000000 0.0000000 FBQ8 The median is considered a robust measure because it is resistant to: ________ *Outliers* 1.0000000 *Extreme values* 1.0000000 FBQ9 What effect will the elimination of extreme scores at the bottom of a data set have on the mean? ______ *Increase the mean* 1.0000000 0.0000000 FBQ10 The elimination of extreme scores at the top of the set has the effect of: *Reduce the mean* 1.0000000 0.0000000 FBQ11 The sum of deviations taken from mean is: _______________ *0* 1.0000000 *Zero* 0.0000000 FBQ12 The sum of the squares of the deviations about mean divided by the number of observations is: ________ *Variance* 1.0000000 0.0000000 FBQ13 If then sample mean X- will be: ________ 60 1.0000000 0.0000000 FBQ14 *25* 1.0000000 0.0000000 FBQ15 The sum of the squares of the deviations of the values of a variable is least when the deviations are measured from: ____________ *Arithmetic mean* 1.0000000 0.0000000 FBQ16 If X-=100 and Y=2X – 200, then mean of Y values will be: _______ *0* 1.0000000 *Zero* 1.0000000 FBQ17 Step deviation method or coding method is used for computation of the______ *Arithmetic mean* 1.0000000 0.0000000 FBQ18 If the arithmetic mean of 20 values is 10, then sum of these 20 values is:_____ *200* 1.0000000 0.0000000 FBQ19 Ten families have an average of 2 boys. How many boys do they have together? *20* 1.0000000 0.0000000 FBQ20 If the arithmetic mean of the two numbers X1 and X2 is 5 if X1=3, then X2 is:_________ *7* 1.0000000 0.0000000 FBQ21 Given X1=20 and X2=-20. The arithmetic mean will be: ________ *0* 1.0000000 *Zero* 1.0000000 FBQ22 The mean of 10 observations is 10. All the observations are increased by 10%. The mean of increased observations will be: ______ *11* 1.0000000 0.0000000 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______ *59.00* 1.0000000 *59* 1.0000000 FBQ24 The sample mean X- of first n natural numbers is: ________ *(n+1)/2* 1.0000000 0.0000000 FBQ25 The sum of deviations is zero when deviations are taken from:________ *Mean* 1.0000000 0.0000000 0.0000000 FBQ26 When the values in a series are not of equal importance, we calculate the: _____________ *Weighted mean* 1.0000000 0.0000000 FBQ27 When all the values in a series occur the equal number of times, then it is not possible to calculate the:__________ *Weighted mean* 1.0000000 0.0000000 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:_______ *Weighted mean* 1.0000000 0.0000000 FBQ29 The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: ______ *6* 1.0000000 0.0000000 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:____ *Median* 1.0000000 1.0000000 FBQ31 The first step in calculating the median of a discrete variable is to determine the: _______ *Array* 1.0000000 0.0000000 FBQ32 The suitable average for qualitative data is: ________ *Median* 1.0000000 0.0000000 FBQ33 If the smallest observation in a data is decreased, the average which is not affected is: ____ *Median* 1.0000000 0.0000000 FBQ34 Sum of absolute deviations of the values is least when deviations are taken from: ________ *0* 1.0000000 *zero* 1.0000000 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 ____ *59.00* 1.0000000 *59* 1.0000000 Multiple Choice Questions (MCQs) 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: Semi-interquartle 0.0000000 quartiles 1.0000000 mean 0.0000000 limits 0.0000000 MCQ2 The lower and upper quartiles of a symmetrical distribution are 40 and 60 respectively. The value of median is: 50 1.0000000 45 0.0000000 60 0.0000000 35 0.0000000 MCQ3 If in a discrete series 75% values are less than 30, then: Third quartile =30 1.0000000 Second quartile = 30 0.0000000 Third quartile = 75 0.0000000 None of the options 0.0000000 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). 73/5 0.0000000 36/21 0.0000000 35/18 1.0000000 4/5 0.0000000 MCQ5 The mean of first 2n natural numbers is: (2n+1)/2 1.0000000 (2n-1)/2 0.0000000 (n+1)/2 0.0000000 (2n+5)/2 0.0000000 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: ∑nX-∑2n 0.0000000 ∑nX-∑n 1.0000000 ∑2nX-4∑n 0.0000000 ∑2X-∑n 0.0000000 MCQ7 The combined arithmetic mean of two sets of means is calculated by which formula? n1X-1+n2 X-22n1+n2 0.0000000 n1X-1+n2 X-2n1+2n2 0.0000000 n1X-1-n2 X-2n1+2n2 0.0000000 n1X-1+n2 X-2n1+n2 1.0000000 MCQ8 Extreme scores will have the following effect on the median of an examination They may have no effect 1.0000000 The effect is always skewed 0.0000000 The effect is always negative 0.0000000 The effect is always positve 0.0000000 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(X). is actually 5.89. What is the variance of X? 1.61 0.0000000 3.64 0.0000000 2.11 1.0000000 4.76 0.0000000 MCQ10 The grouped frequency distribution shown below is to be used to answer the following question Which class is the modal class? 20 - 24 1.0000000 10 -14 0.0000000 30 - 34 0.0000000 15 - 19 0.0000000 MCQ11 The grouped frequency distribution shown below is to be used to answer the following question Which class is the median class? 20 - 24 1.0000000 10 -14 0.0000000 30 - 34 0.0000000 15 - 19 0.0000000 MCQ12 The grouped frequency distribution shown below is to be used to answer the following question What is the cumulative frequency of the modal class? 16 0.0000000 10 0.0000000 14 1.0000000 12 0.0000000 MCQ13 For a standard normal distribution, what is the values of the mean and variance? Mean = 0, variance = 1 1.0000000 Mean = 1, variance = 0 0.0000000 Variance = 0 0.0000000 Mean = 1 0.0000000 MCQ14 Given the set of numbers: 15, 16, 12, 11, 19, 18, 13 then is, 1200 0.0000000 980 0.0000000 1460 0.0000000 1600 1.0000000 MCQ15 The mean of 63, 19, 52, 10, 95, 18 is 56.18 0.0000000 42.83 1.0000000 60.5 0.0000000 50.21 0.0000000 MCQ16 The median of 63, 19, 52, 10, 95, 18 is 30.6 0.0000000 50.8 0.0000000 35.5 1.0000000 40.7 0.0000000 MCQ17 The mode and the range of the above data are 40, 40 1.0000000 30, 40 0.0000000 40, 50 0.0000000 50, 40 0.0000000 MCQ18 The geometric mean of 6, 8, 10 and 16 is 9.36 1.0000000 11.23 0.0000000 8.11 0.0000000 10.23 0.0000000 MCQ19 The harmonic mean of 6, 7, 8 and 9 is 8.32 0.0000000 6.89 0.0000000 7.33 1.0000000 9.61 0.0000000 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 3.5 0.0000000 1.5 0.0000000 0.6 0.0000000 0.4 1.0000000 MCQ21 A set of sales from an outlet produced the following: 16, 14, 18, 10, 12 compute the variance 9 0.0000000 10 0.0000000 8 1.0000000 12 0.0000000 MCQ22 The coefficient of variation for data set whose mean is 10 and variance 100 is 100% 1.0000000 80% 0.0000000 95% 0.0000000 75% 0.0000000 MCQ23 For a symmetric distribution The mean, median and the mode are equal 1.0000000 The mean, median are equal 0.0000000 The mean, mode are equal 0.0000000 The mean, median and the mode are different 0.0000000 MCQ24 Which statistics is found by summing all the values and dividing by the number of observations? The median 0.0000000 The arithmetic mean 1.0000000 The mode 0.0000000 None of the options 0.0000000 MCQ25 How would you describe the skewness of a distribution whose mean is smaller than the median? Negatively skewed 1.0000000 Positively skewed 0.0000000 normal 0.0000000 None of the options 0.0000000 MCQ26 What level of measurement is required for the median? nominal 0.0000000 ordinal 1.0000000 discrete 0.0000000 continuous 0.0000000 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 Geometric mean 1.0000000 Harmonic mean 0.0000000 Arithmetic mean 0.0000000 Standard variation 0.0000000 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? symmetric 1.0000000 asymmetric 0.0000000 Beta 0.0000000 alpha 0.0000000 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: 0.6 0.0000000 0.9 0.0000000 0.7 0.0000000 0.4 1.0000000 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: 8 1.0000000 10 0.0000000 9 0.0000000 7 0.0000000 MCQ31 The coefficient of variation for data set whose mean is 16 and variance 10 is 19.8 1.0000000 12.7 0.0000000 10.8 0.0000000 14.7 0.0000000 MCQ32 Given the mean = 60 and variance is 625, find the coefficient of variation 63.9% 0.0000000 55.7% 0.0000000 41.7% 1.0000000 72.1% 0.0000000 MCQ33 Suppose A and B are independent events with PA=0.2, PB=0.6..What is PAB=? 0.4 0.0000000 0.2 1.0000000 0.7 0.0000000 0.1 0.0000000 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? 144 degree 1.0000000 152 degree 0.0000000 98 degree 0.0000000 108 degree 0.0000000 MCQ35 The data collected by questionnaires are usually classified as what type of data? Secondary data 0.0000000 direct 0.0000000 indirect 0.0000000 Primary data 1.0000000