Let x1 , x2 , and x3 be 0 - 1 variables whose values indicate ...

[darbym82]

Let x1 , x2 , and x3 be 0 - 1 variables whose values indicate whether the projects are not done (0) or are done (1). Which answer below indicates that at least two of the projects must be done?
 a. x1 + x2 + x3  2
  b. x1 + x2 + x3  2
  c. x1 + x2 + x3 = 2
  d. x1 - x2 = 0

Question 2

A random sample of 21 checking accounts at a bank showed an average daily balance of 430 with a standard deviation of 50.
 a. Provide a 95 confidence interval estimate of the variance of the population of the checking accounts.
  b. Provide a 95 confidence interval estimate of the standard deviation of the population of the checking accounts.

[otokexnaru]

Answer to Question 1

A

Answer to Question 2

a. 1463.27 to 5213.76
b. 38.25 to 72.21

[darbym82]

Great answer, keep it coming

[Jsherida]

Wow, this really help