a recent survey of 128 high school students indicated the following information about release times from school.
35% wanted to start school and hour earlier
20% liked things how they currently were
39% wanted to start school a half an hour later and get out later in the day
6% had no opinion
the margin of error for this survey was calculated to be plus or minus 4%.
the sample size n=128
find. the interval estimates for those that want to get out earlier and those that want to get out later. explain how it would be possible for the group that wants to get out of school earlier to win after all the votes are counted

Question

04-05-2020
Mathematics

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a recent survey of 128 high school students indicated the following information about release times from school.
35% wanted to start school and hour earlier
20% liked things how they currently were
39% wanted to start school a half an hour later and get out later in the day
6% had no opinion
the margin of error for this survey was calculated to be plus or minus 4%.
the sample size n=128
find. the interval estimates for those that want to get out earlier and those that want to get out later. explain how it would be possible for the group that wants to get out of school earlier to win after all the votes are counted

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AyBaba7 AyBaba7 · Answer 1 · 2020-05-10T06:00:37+02:00

Answer:

A) Interval estimate for those that want to get out earlier = (35%) ± (4%) = (31%, 39%)

Interval estimate for those that want to get out later = (39%) ± (4%) = (35%, 43%)

B) The group that wants to get out of school earlier can win after all the votes are counted if their true population proportion takes on a value that is higher than the closest true population proportion (for the group that wants to get out of school later)

That is, in the (31%, 39%) and (35%, 43%) obtained in (a), a range of (35.1%, 39%) and (35%, 38.9%) show how possible that the group that wants to get out of school earlier can win after all the votes are counted.

Step-by-step explanation:

The Interval estimate for the proportion is basically an interval of range of values where the true population proportion can be found with a certain level of confidence.

Mathematically,

Interval estimate = (Sample proportion) ± (Margin of error)

Margin of Error is the width of the confidence interval about the proportion.

a) Find the interval estimates

i) for those that want to get out earlier and

ii) those that want to get out later.

i) Sample proportion of those that want to get out earlier = 35%

Margin of Error = 4%

Interval estimate for those that want to get out earlier = (35%) ± (4%) = (31%, 39%)

ii) Sample proportion of those that want to get out later = 39%

Margin of Error = 4%

Interval estimate for those that want to get out later = (39%) ± (4%) = (35%, 43%)

b) Explain how it would be possible for the group that wants to get out of school earlier to win after all the votes are counted.

Since the interval estimates represent the range of values that the true population proportion can take on for each group that prefer a particular option, the group that wants to get out of school earlier van have their proportion take on values between 31% and 39%. If their true population takes on a value that is highest (which is very possible from the interval estimate), and the group with the highest proportion in the sample, (the group that wants to get out of school later, whose true population proportion can take between 35% and 43%) has a true population proportion that is less than that of the group that wants to get out of school earlier, then, the group that wants to get out of school earlier can win after all the votes are counted.

Hope this Helps!!!