18. A random sample of 100 preschool children in Camperdown revealed that only 60 had been vaccinated. Provide an approximate 95% confidence interval for the proportion of preschool children vaccinated in that suburb.

95% confidence interval for the proportion of preschool children vaccinated in that suburb lie between (.5042 , .6958) 0r 50.42% to 69.58%

Step-by-step explanation:

Given -

A random sample of 100 preschool children in Camperdown revealed that only 60 had been vaccinated

Sample size ( n) = 100

Sample proportion   =  = 0.6

confidence interval = 95%

1 -.95 = .05

 = = 1.96

95% confidence interval for the proportion of preschool children vaccinated in that suburb =

                                         =

                                         =

                                           =

                                          =  (0.6 - .0958) , (0.6 + .0958)

                                          = (.5042 , .6958)

x = ± 6i

step-by-step explanation:

x^2 = -36

take the square root of each side

sqrt(x^2) = sqrt(-36)

we know sqrt(ab) = sqrt(a) sqrt(b)

x = ±sqrt(36) sqrt(-1)

we know that sqrt (-1) = i

x = ± 6i

range is infinite on both x and y axis positive and negative

step-by-step explanation: