6. 0.3/1 points | Previous Arswers FleldStat NT4 1.Num.008 My Notes O Ask Your T

Question

6. 0.3/1 points | Previous Arswers FleldStat NT4 1.Num.008 My Notes O Ask Your Teacher Twenty students were asked how many followers they currently have on the social networking site Twitter. Their responses are below. 3, 7, 8, 12, 16, 18, 23, 25, 25, 33, 39, 55, 42, 66, 73, 80, 120, 220, 270, 820 (a) Compute the mean. (Enter your answer to two decimal places.) 97.75 | (see Section 1.6.3) (b) Compute the sum of squared errors (SS). (Round your answer to two decimal places.) (c) Compute the variance. (Round your answer to two decimal places.) 33844.96 × (see Section 1.6.3) (d) Compute the standard deviation. (Round your answer to two decimal places.) 183.98 (se Section 1,6.3) "Submit Answer | Save Progress . Practice Another Version |

Explanation / Answer

SolutionA:

twitter <- c(3,7,8,12,16,18,23,25,25,33,39,55,42,66,73,80,120,220,270,820)
mean(twitter)

mean=97.75

SolutionB:

SS can be maually created as below:

SS=643017.8

Solutionc:

var(twitter)

variance=33847.78

Solutiond:

sd(twitter)

sd= 183.9777

sd=183.98

Correct

ANSWERS IN BOLD

X XBAR X-XBAAR (X-XBAR)^2 3 97.75 -94.75 8977.563 7 97.75 -90.75 8235.563 8 97.75 -89.75 8055.063 12 97.75 -85.75 7353.063 16 97.75 -81.75 6683.063 18 97.75 -79.75 6360.063 23 97.75 -74.75 5587.563 25 97.75 -72.75 5292.563 25 97.75 -72.75 5292.563 33 97.75 -64.75 4192.563 39 97.75 -58.75 3451.563 55 97.75 -42.75 1827.563 42 97.75 -55.75 3108.063 66 97.75 -31.75 1008.063 73 97.75 -24.75 612.5625 80 97.75 -17.75 315.0625 120 97.75 22.25 495.0625 220 97.75 122.25 14945.06 270 97.75 172.25 29670.06 820 97.75 722.25 521645.1 SS 643107.8

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