using the excel data ...     College Student Weekly Earnings in Dollars (n = 5) Hours Worked (X) Weekly Pay (Y) (xi - x̅)2 (yi - y̅)2 (xi - x̅)(yi - y̅) 11 95       16 173       22 210       18 157       30 270                 x̅=?????? y̅=??????? SSxx SSyy SSxy

22 percent of students are male. 33 percent of students take a Statistics course. 48 percent of male students take statistics. Give your answers as a decimal to 4 decimal places.(a) What percent of students are male that take a statistics course?  (b) What percent of students are females that take a statistics course?

F 5 6 7 8 + 9 10 11 12 13 14 15 16 data + 17 a Based on the boxplot above, identify the 5 number summary

The dotplot below shows 2005 U.S. household income. Each dot represents half a million households. Each stack/column of dots is a $10,000 range. For example, the far left (first) stack/column of dots represents households that make between $0 and $9,999. U.S. Household Income 2005 50000 100000 U.S. Household Income 150000 200000 Which of the statements best describes the meaning of the highest dot? (The single dot, not the entire stack.) The household which made the largest income O Half a million households which made the largest income Half a million households which made between $10,000 and $19,999

1. Use the following methods to test Hoμ₁ = μ2 versus H₁ μ₁ μ2 for the data in worksheet 9.1 of the Excel data file: a. Tukey's Quick Test b. A boxplot slippage test c. The two-sample t test d. The Mann-Whitney test (use Stat> Nonparametrics> Mann-Whitney)

Atlantic hurricanes form off the western coast of Africa. As warm moist air rises, it begins to rotate around a low- pressure system. This rotation is sustained by warm ocean temperatures and a central low pressure. Once a sustained wind speed of 74 miles per hour is reached, the storm is considered a hurricane. As man-made climate change continues to increase the temperature of the Earth's oceans, it is expected that the strength of hurricanes will Typically, a lower central pressure within a hurricane's eye is associated with a higher wind speed. Here, statistical software (R/RStudio) will be used to explore this relationship by applying linear regression methods. Using a database of landfalling hurricanes in the United States, a linear regression will be used to correlate the central pressure of each hurricane to its maximum sustained wind speed. increase. Regression Plot y=942.196-0.884*x R^2=0.768 ----- ----------- -. •... •. 980 1000 940 960 900 920 Independent Variable (x)…

X Y 0 0 1 7 2 14 3 21

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In case of omitted variable bias, which of the following OLS assumption will be violated Group of answer choices (X,Y) are i.i.d. drawn from their joint distribution E(u|X)=0 There are no outliers for X and u. There is heteroskedasticity.

The plot below is the boxplot of the birth weights (in ounces) of 250 babies born in a local hospital last year. How many children had birth weights between 80 ounces and 110 ounces? 140 130- 120- 110- 100 90- 80- 70- I I I I I I Birth weight (in ounces) 1 I I I I I I I