Confidence interval

 

The data table below provides cost overruns (actual costs minus estimated costs) in thousands of dollars on similar-size engineering projects completed this year. Calculate the following:

a.    A 95 percent confidence interval for the average overrun this process would deliver over a long time period, assuming it is stable.

a.     A 99 percent confidence interval for the same average.

Explain why this is a different width than the 95 percent interval.

 

  -16

-480

-222

-404

  -77

  -76

-397

 221

-427

 113

  93

-268

-791

 107

-230

-165

-272

  287

-118

 133

-285

    9

 276

-344

-651

  36

-394

 383

-298

 161

 

 

 

 

 

 

 

 

b.

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Confidence Interval

Suppose that a poll asks voters how they feel about the President’s handling of the crisis in the financial markets. The results show that 575 out of the 1280 people polled say they either “approve” or “strongly approve” of the President’s handling of this matter. Based on the sample referenced above, find a 95% confidence interval estimate for the proportion of the entire voter population who “approve” or “strongly approve” of the President’s handling of the crisis in the financial markets.

If the same sample proportion was found in a sample twice as large—that is, 1150 out of 2560—how would this affect the confidence interval?

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12 pt Times New Roman

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Confidence Interval

Suppose that a poll asks voters how they feel about the President’s handling of the crisis in the financial markets. The results show that 575 out of the 1280 people polled say they either “approve” or “strongly approve” of the President’s handling of this matter. Based on the sample referenced above, find a 95% confidence interval estimate for the proportion of the entire voter population who “approve” or “strongly approve” of the President’s handling of the crisis in the financial markets.

If the same sample proportion was found in a sample twice as large—that is, 1150 out of 2560—how would this affect the confidence interval?

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275 words per page

You essay will be 275 words per page. Tell your writer how many words you need, or the pages.


12 pt Times New Roman

Unless otherwise stated, we use 12pt Arial/Times New Roman as the font for your paper.


Double line spacing

Your essay will have double spaced text. View our sample essays.


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Confidence interval

 

The data table below provides cost overruns (actual costs minus estimated costs) in thousands of dollars on similar-size engineering projects completed this year. Calculate the following:

a.    A 95 percent confidence interval for the average overrun this process would deliver over a long time period, assuming it is stable.

a.     A 99 percent confidence interval for the same average.

Explain why this is a different width than the 95 percent interval.

 

  -16

-480

-222

-404

  -77

  -76

-397

 221

-427

 113

  93

-268

-791

 107

-230

-165

-272

  287

-118

 133

-285

    9

 276

-344

-651

  36

-394

 383

-298

 161

 

 

 

 

 

 

 

 

b.

Just in case you need an assignment done, hire us. Using our writing services will make your life easier because we deliver exceptional results. Use us to get an A!

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course-preview

275 words per page

You essay will be 275 words per page. Tell your writer how many words you need, or the pages.


12 pt Times New Roman

Unless otherwise stated, we use 12pt Arial/Times New Roman as the font for your paper.


Double line spacing

Your essay will have double spaced text. View our sample essays.


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Image 3

Confidence interval

 

The data table below provides cost overruns (actual costs minus estimated costs) in thousands of dollars on similar-size engineering projects completed this year. Calculate the following:

a.    A 95 percent confidence interval for the average overrun this process would deliver over a long time period, assuming it is stable.

a.     A 99 percent confidence interval for the same average.

Explain why this is a different width than the 95 percent interval.

 

  -16

-480

-222

-404

  -77

  -76

-397

 221

-427

 113

  93

-268

-791

 107

-230

-165

-272

  287

-118

 133

-285

    9

 276

-344

-651

  36

-394

 383

-298

 161

 

 

 

 

 

 

 

 

b.

Just in case you need an assignment done, hire us. Using our writing services will make your life easier because we deliver exceptional results. Use us to get an A!

We are the Best!

course-preview

275 words per page

You essay will be 275 words per page. Tell your writer how many words you need, or the pages.


12 pt Times New Roman

Unless otherwise stated, we use 12pt Arial/Times New Roman as the font for your paper.


Double line spacing

Your essay will have double spaced text. View our sample essays.


Any citation style

APA, MLA, Chicago/Turabian, Harvard, our writers are experts at formatting.


We Accept

Secure Payment
Image 3