Question

When planning a study from which you will calculate a confidence interval, your goal should be to have a confidence interval that has a: high confidence level and a low margin of error. low confidence level and a high margin of error. high confidence level and a high margin of error. low confidence level and a low margin of error.

Answer 1

Sol:wwhen youa re creating confidence interval you should have hogh confidence level and low margin of error

For ex sigma=12,sample size =36 xbar=50 95% confidence interval is

xbar-MOE ,xbar+MOE

MOE in excel ==CONFIDENCE.T(0.05,12,36)=

4.060216

50-4.060216,50+4.060216

45.93978414,54.06021586

similarly 99% confidenc einterval is

margin of error=5.447611

99% lowe rlimit=44.55239

99% upper limit=55.44761

margin of here is not reduced here for the samplesize,if we increase sample size,margin of error gets reduced

: high confidence level and a low margin of error