ECON 261 NSC Fall 2018 Joseph Harwell &1 9/13/18 1:56 AM Quiz: Chapter 3 Review

Question

ECON 261 NSC Fall 2018 Joseph Harwell &1 9/13/18 1:56 AM Quiz: Chapter 3 Review Quiz This Question: 1 pt Submit Qu 10 of 22 (6 complete) This Quiz: 22 pts possib Find the standard deviation, s, of sample data summarized in the frequency distribution table below by using the formula below, where x represents the class midpoint f represents the class frequency, and n represents the total number of sample from the original list of data values, 11.1 values. Also, compare the computed standard deviation to the standard deviation obtained n(n- 1) 30.390.49505960.69 70.798089 90.99 39 Interval 40-49 60-69 35 Frequency Standard deviation (Round to one decimal place as needed ) r a difference of 20% between two values of a standard deviation to be significant How does this computed value compare with the given standard 11.12 O A. The computed value is significantly greater than the given value. O B. The computed value is significantly less than the given value O C. The computed value is not significantly ifferent from the given value Click to select your

Explanation / Answer

standard deviation = 15.4

(15.4 - 11.1)/11.1 = 38.34%

computed value is significantly greater than the given value

Interval Days (f) Midpoint(x) x*f x^2 f*x^2 30-39 2 34.5 69 1190.25 2380.5 40-49 3 44.5 133.5 1980.25 5940.75 50-59 9 54.5 490.5 2970.25 26732.25 60-69 4 64.5 258 4160.25 16641 70-79 9 74.5 670.5 5550.25 49952.25 80-89 35 84.5 2957.5 7140.25 249908.8 90-99 39 94.5 3685.5 8930.25 348279.8 Total 101 8264.5 699835.3

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