One hundred tomato plants were randomly selected from a large garden, and a 90% confidence interval was computed to determine the true proportion of plants that produce useable tomatoes. The interval is 0.86 to 0.92. What can be done to decrease the margin of error? Check all that apply.
Increase the sample size.
Increase the confidence level.
Select another sample.
Decrease the sample size.
Decrease the confidence level.
Select many samples of the same size and calculate the intervals.
ITS A & E