Let ŷ represent the profit (in thousands of dollars) for a certain company xx years after 1965. A statistician calculates a linear model ŷ = 0.38xx + 15 Use the model to estimate the profit in 1973.  Your answer should be in dollars, not thousands of dollars. Profit =$

Use linear regression on your calculator to find the equation of the linear function that best fits this data. 1 3 4 5 6 y 84 110 139 170 180 222 = mx + b. Round all numbers to 2 decimal Hint: Write your final answer as an equation in the form y places.

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Suppose that the number of tee shirts sold (N) depends linearly on the price charged (x). Write an equation showing this dependence.

In 16% of all homes with a stay-at-home parent, the father is the stay-at-home parent (Pew Research, June 5, 2014). An independent research firm has been charged with conducting a sample survey to obtain more current information. a. What sample size is needed if the research firm's goal is to estimate the current proportion of homes with a stay-at-home parent in which the father is the stay-at-home parent with a margin of error of .03 (round up to the next whole number)? Use a 95% confidence level. b. Repeat part (a) using a 99% confidence level (round up to the next whole number).

Blood Alcohol Percent The table below gives thenumber of drinks and the resulting blood alcohol percent for a 220-lb man.a. The rate of change in blood alcohol percent perdrink for a 220-lb man is a constant. What is it?b. Write the equation of the function that models theblood alcohol percent as a function of the numberof drinks

The table shows the number of adult softball teams since 1990, where x represents the year since 2000 and y represents the number of teams (in thousands). Make a scatter plot of the data and determine which type of model best fits the data.  Year, x 0 1 2 3 4 Number of teams (in thousands) 163 155 149 143 119       linear     quadratic     exponential     cubic