When we estimate B1 without controlling for X2, we derived in class that the B1 we are able to estimate is B₁ =B₁ + B₂61 What term measures the size of the bias in our estimate? OB2d1 OB2 d1 OB1 4

The table below shows data on a subsample of participants in the 7th examination of the Framingham Offspring Study. Characteristic n Sample Population Standard Мean Deviation Systolic Blood 10 121.2 11.1 Pressure Diastolic Blood 10 71.3 7.2 Pressure Total Serum 10 202.3 37.7 Cholesterol Weight 10 176.0 33.0 Height 10 67.175 4.205 Body Mass 10 27.26 3.10 Index Which of the following is the 95% confidence level for Systolic Blood Pressure 114.32, 128.08 120.98, 121.42 121.16, 121.24 112.16, 130.24

What is the value of the test statistic for a test with a null hypothesis that mu = 250, Xbar = 260 the standard deviation = 5  and n = 100?

Exhibit 10-1 Salary information regarding two independent random samples of male and female employees of a large company is shown below. Sample size Sampe mean salary (in $1000s) Population variance Male 64 44 128 Female 36 41 72 Refer to Exhibit 10-1. At 95% confidence, we have enough evidence to conclude that the O a. average salary of males is significantly lower than females O b. salaries of males and females are equal O c. average salary of males is significantly greater than females O d. null hypothesis fails to be rejected

You have been hired as a consultant by building contractor, who have been sued by the owners' representatives of a large condominium project for shoddy construction work. In order to assess the damages for the various units, the owners' association sent out a letter to owners and asked if people were willing to make their units available for destructive testing. Destructive testing was conducted in some of these units as a result of the responses. Based on the tests, the owners' association inferred the damage over the entire condo complex. Do you think that the inference is valid in this case?   a).  No, the inference is not valid. It is an example of sample selection bias because owners whose units were relatively more damaged were more likely to make theor units available for destructive testing.   b).  No, the inference is not valid because not all units were tested.   c).  Yes, the inference is valid. The study will correctly determine the incidence of damages in the concominium…