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- A statistics instructor asks each student in his classes to report how much the student spent on textbooks for the semester. The figures reported by students are shown below. 725 735 555 420 385 480 505 270 405 285 585 450 515 560 500 395 545 595 365 455 505 345 555 485 560 475 520 455 355 590 550 495 505 505 495 465 370 355 480 385 515 605 480 410 485 560 475 350 465 435 455 380 320 535 565 520 510 495 485 650 490 295 555 540 565 490 570 380 610 600 390 375 390 335 525 445 540 490 485 555 440 560 405 590 520 470 560 510 340 385 585 635 415 455 590 385 505 510 545 405 470 560 495 515 495 595 565 615 470 680 465 470 310 470 505 465 375 360 650 460 560 500 375 500 370 415 490 440 470 525 535 640 385 475 425 595 505 365 485 495 390 380 585 690 Treat the data above as POPULATION data. 1 The mean expenditure on textbooks by all students is: a $485.38 b $495.29 c $505.40 d $515.71Calculate the mean of the projected annual revenues of the 7 countries. Show full working for the mean calculation.Suppose x~n(8,9). What value of x is 0.67 standard deviations to the left of the mean?
- Data point X value is 120 Data point Y value is 300 Data point Z value is 285 What is the mean?By definition, the mean a is the center of gravity of the data. b is always the central (or middle) data point. c balances the number of observations on either side of mean value. d balances the deviations of the data from the mean. e Both (b) and (c) are correct f Both (a) and (d) are correct.The variance of the OLS estimator Select one: a. increases as the number of observations increases b. increases as the variance of the unobservable increases c. decreases as the number of observations increases d. decreases as the variance of the unobservable increases e. c) and d) are true f. b) and c) are true g. a) and b) are true
- Ten economists were asked to predict the percentage growth in the Consumer Price Index over the next year. Their forecasts were as follows: 3.6 3.1 3.9 3.7 3.5 3.7 3.4 3.0 3.7 3.4 a. Compute the sample mean. b. Compute the sample median. c. Find the mode.Find the average (mean) Find the median:SCCoast, an Internet provider in the Southeast, developed the following frequency distribution on the age of Internet users. Find the mean and the standard deviation. (Round squared deviations to nearest whole number and final answer to 2 decimal places.) Age (years) Frequency 10 up to 20 3 20 up to 30 7 30 up to 40 18 40 up to 50 20 50 up to 60 12
- According to Chebyshev's theorem, at least what percentage of the observations in a data set will lie within three standard deviations of the mean?G. Thumb, the leading salesperson for the Moe D. Lawn Landscaping Company, turned in the following summary of sales for the week of October 23–28: Date No. of Clients Oct. 23 13 Oct. 24 8 Oct. 25 10 Oct. 26 15 Oct. 27 10 Oct. 28 22 Find the mean, median, and mode. (If an answer does not exist, enter DNE.) mean clients median clients mode clientsHow can we say that Sample Average is the Efficient Linear Estimator of E(Y)?