How much is a college degree worth? The 2010 annual salaries in dollars for a random sample of females who are 25 years old and older given their years of education are shown below. Years of Education:   18 16 14 12 10 15 13 18 12 16 16 Annual Salary (in Dollars):   52,866    40,393    27,062    21,427    14,470    41,010   31,376   79,962   21,387   39,925 57,815  Is there a linear relationship between educational attainment and annual salary?  a. Draw the scatterplot for the variables.  b. Describe the relationship, if any, shown by the scatterplot.  c. Calculate r, the correlation coefficient.  How does the correlation coefficient compare to the relationship you saw in the scatterplot?

Here is a set of sample data. 53 85 72 19 63 80 21 78 79 5 33 23 37 11 31 61 24 2 58 1 28                   Base on the data above, identify the 5 number summary

Foxbees magazine published data on the best small firms in 2012. These publicly traded firms have a stock price of at least $5 per share and have reported annual revenue between $5 million and $1 billion. The data below shows the ages of the corporate CEOS for a random sample of these firms. 49 67 59 48 45 49 39 44 37 38 48 38 43 48 62 74 70 58 58 40 74 35 36 54 38 45 54 55 64 75 69 36 55 72 69 60 40 64 39 59 74 52 40 49 38 38 74 50 55 50 R vector Copy to clipboard a) What is the mean of the sample? (Round to 4 decimal places) b) What is the standard deviation of the sample mean or the standard error? (Round to 4 decimal places) c) What is the sample size? (Round to whole number)

The ages of a sample of 12 students enrolled in an online macroeconomics course are as follows: 21 22 27 36 18 19 22 23 22 28 36 33 a. What is the mean age for this sample? b. Find the median age. c. What is the value of the modal age?

A statistical program is recommended. The data below contains mileage, age, and selling price for a sample of 33 sedans. Price Mileage Age Price Mileage Age Price Mileage Age 16,998 35,000 3 11,599 95,000 8 18,998 20,000 2 17,599 16,000 3 10,499 123,000 8 12,599 63,000 7 15,998 42,000 3 14,599 54,000 5 12,599 70,000 6 15,998 61,000 4 10,599 68,000 11 10,998 88,000 10 11,599 102,000 7 16,998 40,000 4 11,998 86,000 6 13,998 109,000 4 20,998 7,000 1 12,998 60,000 6 14,998 60,000 5 11,599 81,000 9 17,599 45,000 2 11,599 88,000 9 12,599 70,000 9,998 96,000 11 12,599 58,000 8 13,599 86,000 5 9,998 60,000 11 14,998 27,000 6 11,599 92,000 7 16,998 36,000 2 15,998 32,000 4 9,599 120,000 10 17,599 45,000 2 Use the estimated regression equation that predicts the selling price of a used sedan given the mileage and age of the car to answer the following questions. (Let x₁ represent the mileage of the car, x2 represent the age of the car, and y represent the selling price of the car.) ŷ 20385.25…

The number of winter vacation days during one year taken by 159 randomly selected employees were recorded. The data is summarized in the table below. Number   of Winter Vacation Days      Frequency    Cumulative Frequency    0 – 9 43   10 – 19 41   20 – 29 21   30 – 39 37   40 – 49 17

The following are (fictional) McDonald's service times (in seconds) for a random sample of drive-thru customers.  98  117  45  103  75  65  129  93  109  84  56  118 Calculate the median

The increasing annual cost (including tuition, room, board, books, and fees) to attend college has been widely discussed (Time.com). The following random samples show the annual cost of attending private and public colleges. Data are in thousands of dollars. Private Colleges 51.8 42.2 45.0 33.3 43.0 30.6 44.8 36.8 49.5 42.0   Public Colleges 20.3 22.0 28.2 15.6 24.1 28.5 22.8 25.8 18.5 25.6 14.4 21.8 (a) Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for private colleges. (Round the standard deviation to two decimal places.) sample mean$   thousandsample standard deviation$   thousand Compute the sample mean (in thousand dollars) and sample standard deviation (in thousand dollars) for public colleges. (Round the standard deviation to two decimal places.) sample mean$  thousandsample standard deviation$  thousand (b) What is the point estimate (in thousand dollars) of the difference between the two population…