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

suppose you are planning a study anda you would like to have a
margin of error +/-0.003 with a 95% confidence level. what sample
size should you choose?

Suppose that in planning a study you calculate the margin of
error and decide that it is too large. Specifically, you would like
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smaller margin of error would be to:
decrease the population standard deviation by one-half.
double the sample size.
include four times as many observations in your sample.
make the confidence level one-half as large.
detailed explanation please!!!Thanks!!!

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