Someone i don't understand any of this
(1) the standard deviation for a set of data is 9.5. the mean is 205. what is the margin of error?
(2)the standard deviation of a population is 1.9.
what is the margin of error?
(3) the results of a survey indicate that the true proportion of households who want a park in their neighborhood is likely in the interval (0.52, 0.8) .
what is the point estimate of the proportion of households who want a park in their neighborhood?
(4) in a sample of 200 bottles at a factory, 38 had major defects. the sampling method had a margin of error of 0.02.
what is the interval estimate for the proportion that would have defects in the form (lower limit, upper limit) ?