Consider the following data: x 4 P(X = x) 0.2 567 8 0.2 0.2 0.2 0.2 Step 1 of 5: Find the expected value E(X). Round your answer to one decimal place. Copy Data
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- Find the mean hourly cost when the cell phone described above is used for 240 minutes.What does the y -intercept on the graph of a logistic equation correspond to for a population modeled by that equation?Worker1 Worker2 Worker3 14.84 1 IT Help Desk Questions 2 26.57 10.08 3. 24.89 18.32 19.61 The IT Help Desk supervisor from the last homework is analyzing the data collected about the mean time it takes for each Help Desk worker to solve a walk-in problem. 4 18.8 12.95 12.82 21.87 20.21 18.52 25.28 20.57 17.35 7 18.75 14.8 15.5 The supervisor believes that most walk-in problems would take at least 5 minutes but should be solved in less than 30 minutes. On 8. 23.82 18.33 13.39 9. 27.34 25.77 19.46 average, student workers should take only 15 minutes to solve any walk-in problem or decide to refer the customer to a senior IT Help Desk employee. 10 21.06 13.57 16.08 11 24.48 16.52 18.51 12 26.9 21.12 14.37 The file ITtimes.csv contains data recorded times for three 13 27.78 17.77 19.87 different student workers. For each worker, 25 walk-ins were randomly selected from last month's working hours. Remember, most statistical methods require a random sample from the population of interest. 14…
- In 2013 the average houshold credit card balance was $9,884. In 2016 the average houshold credit card balance was $11,184. (a) Compute the average yearly change in credit card balance from 2013 to 2016 (b) Use this to predict what the average credit card balance was in:i. 2014ii. 2015iii. 2017iv. 2018 (c) In 2014 the avearge balance was $10,450 and in 2015 the avearge balance was $10,762. Where your predictions good for those years? (d) In 2017 the average balance was $10,821 and in 2018 the aveage balance was $9,333. Where your predictions good for those years?Consider the model y=-2.45x+7.18 derived from data between x=4 and x=10. What value of x represents interpolation of the data?Suppose that 95% of the bags of certain fertilizer mix weigh between 49 and 53 pounds. Averages of three succesive bags were plotted, and 47.5% of these were observed to lie between 51 and X pounds. Estimate the value of X. State assumptions you make and say whether these assumptions are likely to be true for this example.
- amu mun nuo 19. Commute Time to Work A survey of 15 large U.S. cities finds that the average commute time one way is 25.4 minutes. A chamber of commerce executive Technology Step by Step TI-84 Plus Hypothesis Test for the M 1. Enter the data values into L1. 2. Press STAT and move the c 3. Press 2 for T-Test. Step by Step 4. Move the cursor to Data and 5. Type in the appropriate valuIn the following MFNITAB output, some of the numbers have been accidentally erased. Recompute them, using the numbers still available. There are n = 20 points in the data set. Predictor Coef SE Coef Constant (a) 0.43309 0.688 (b) X. 0.18917 0.065729 (c) (d) S = 0.67580R-Sq = 31.0%Given the data points (2, 29.5), (5, 523), (7, 1807), and (11, 9853), find the value of f(x) if x = 3.79 using linear interpolation. Round off your final answer to five decimal places but do not round off in preliminary calculations. Round your answer to 5 decimal places. Correct answer: 323.95500
- Listed below are the numbers of deaths resulting from motor vehicle crashes. Let x represent the year, with 1975 coded as x = 1, 1980 coded as x = 6, 1985 coded as x = 11, and so on. Construct a scatterplot and identify the mathematical model that best fits the given data. Use the best model to find the projected number of deaths for the year 2028. x (year) 1975 1980 1985 1990 1995 2000 2005 2010 D y (deaths) 44,533 51,122 43,809 44,590 41,798 41,960 43,436 32,697 (...) Choose the correct graph below. O A. O B. O C. D. 52000- 52000- 52000- 52000- DDDD 00 X X X X 32000+ 32000 32000+ 32000+ 0 40 0 40 0 40 0 40 What is the equation of the best model? Select the correct choice below and fill in the answer boxes to complete your choice. Enter only nonzero values. (Type integers or decimals rounded to three decimal places as needed.) O A. y= X B. y = + In x O C. y = + O D. X y=² O E. y = x² + X + Use the best model to find the projected number of such deaths for the year 2028. The projected…A regression was run to determine if there is a relationship between hours of TV watched per day (x) and number of situps a person can do (y).The results of the regression were:ŷ=a+bx a=38.98 b=-1.245 r2=0.802816 r=-0.896 Use this to predict the number of situps a person who watches 9 hours of TV can do (to one decimal place)Table 9.2 Average Returns for Bonds 1950 to 1959 1960 to 1969 1970 to 1979 1980 to 1989 1990 to 1999 2000 to 2009 1950 to 1959 1960 to 1969 1970 to 1979 1980 to 1989 1990 to 1999 2000 to 2009 Average Average Average Table 9.4 Annual Standard Deviation for T-Bills Decade 1950s 1960s 1970s 1980s 1990s 2000s 8.2 Average Average 4.5 2.9 Average T-Bills 2.3% 4.2 6.4 Use the tables above to calculate the coefficient of variation of the risk-return relatic (Round your answers to 2 decimal places.) Cov 0.71 T-Bills 0.9% 1.4 2.2 2.5 1.3 2.1
