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## ch2andch31. A nummerical summary of a population is aStatistic, parameter, Qualitative response, variable 2. quiz builder The commuting times of ten employees (in minutes) are listed.find the mode score:65-66-67-66-67-70-67-70-71-68 67 min, 65 min, 68min, 66 min 3. which of the following is not a step while calculating a standard deviation : obtaining arithmetic mean, computing cumulative frequency., obtaining deviation each item from the arithmetic mean. , squaring each deviation 4. The heights in centimeters of 5 students are:165,175,176,159,170, the mean and median respectively: 169,170, 175,169, 170,175, 171,169 5. calculate the mean of each data set (9,10,11,7,13) -(10,10,10,10,10)-(1,1,10,19,19) 10,10,10 learning , 11,10,10, 10,5,50, 50,50,50 6. ESL The relative frequency of a class is computed by: dividing the midpoint of class by the sample size., dividing the frequency of class by the sum of all frequencies., dividing the sample size by frequency of the class., dividing the frequency of the class by the sample size. 7. The sum of percent frequencies of all calsses will always equal: one, the number of classes , the number of items in the study., 100 8. Listed below are measure amounts of lead in the air .Find the median for this sample:5.40-1.10-0.42-0.73-0.48-1.10 0.73, 5.40, 0.42, 0.915 9. Find the midrange for this sample: 5.40- 1.10-0.42-0.73-0.48-1.10 0.42, 0.45, 2.910, 1.10 10. Find the mean of test scores (85,90,75) but the first test counts for 20%25 ,the second test counts for 30%25 and the third test counts for 50%25 : 74.3, 90, 85, 81.5 11. The hights in cm of ten students are: 157 - 152- 165- 151- 160-156-155-162-158-163 Find the range of the data: 10, 13, 15, 14 12. Find the variance of the data set: (1,2,3,4,10) 12.5, 9, 8, 7 13. The data shown below are the weights (in pounds) of different of vegetabeles that Ashley bought: 16-14- 11-16-7-16 -14-11-11.find the mode 16,11 biomodal, 16,14 multimodal, 11, 16 14. What is the population standard deviation for the numbers: 75, 83, 96, 100, 121 and 125? 16.9, 17.1, 17.6, 18.2 15. What is the standard deviation of the first 10 natural numbers (1 to 10)? 2.45, 2.87 save time , 3, 8.25 16. 17. What is the variance of the first 10 numbers of the Fibonacci sequence? 10.47, 16.88, 109.56, 285.01 |