state the limitations of using a cubic function with inflection point to model the side of a hill. What assumptions have been made that may affect the reasonableness of your solutions?

Determine the total area under the standard normal curve in parts (a) through (c) below. (a) Find the area under the normal curve to the left of z = - 1 plus the area under the normal curve to the right of z = 1. The combined area is 03173 (Round to four decimal places as needed.) (b) Find the area under the normal curve to the left of z = – 1.55 plus the area under the normal curve to the right of z=2.55. The combined area is (Round to four decimal places as needed.)

In a regression problem with one output variable and one input variable, we set up two cutpoints z1 and z2 for the input variable and we fit a step function regression model based on these two cutpoints of the input variable. If you write the regression problem in matrix form y = X%*%β + ε, how many rows would the vector β have?

Hand written answer plzzzz

You are given information on the use of public transportation in the data set within the image. Number of weekly riders                                     y -variable Price per week (of using public transportation) x-variable Population of city                                                 x-variable Monthly income of riders                                     x variable         Average parking rates per month x-variable   (a) Run a regression of the Number of weekly riders on Price per week, Population of city, Monthly income of riders, Average parking rates per month. Please copy and paste your regression results and do not submit your EXCEL worksheet.   (b) If the average parking rates increase by $1, what will be the change in the number of weekly riders? Will this change be a statistically significant change? Please explain.   (c) If the price per week (of using public transportation) increases by $1, what will be the change in the number of weekly riders? Will this change be…

Use the method of cylindrical shells to find the volume V generated by rotating the region bounded by the curves about the given axis. y = cos(xx/2), y = 0, 0sxs 1 about the y-axis

A lake has two species of fish: bass and catfish. The number of bass and catfish living in the lake, B and C respectively, depend on the temperature of the lake, T (in degrees Farenheit). The functions modeling this dependency are given below: B(T) = 8T2 + 976T – 28890 С(Т) 3D — 2T?+244T — 6893 What are the two temperatures at which the number of bass in the lake is the same as the number of catfish? Enter exact expressions or round your answers to the nearest thousandth. T : T

M9

Explain why in every econometric model there must be an error term, explain its function.

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