Question: Compute the least-squares regression line for the given data set. x 5.7 4.1 6.2 4.4 6.5 5.8 4.9 y 1.9 4.8 0.8 3.9 1.2 1.7

  1. Compute the least-squares regression line for the given data set.

x 5.7 4.1 6.2 4.4 6.5 5.8 4.9

y 1.9 4.8 0.8 3.9 1.2 1.7 3.0

2. Contaminated water: In a sample of 42 water specimens taken from a construction site, 26 contained detectable levels of lead.

a. Construct a 90% confidence interval for the proportion of water specimens that contain detectable levels of lead.

b. Construct a 95% confidence interval for the proportion of water specimens that contain detectable levels of lead.

c. What is the effect of increasing the level of confidence on the width of the interval?

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