# 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.

#### We are the Best!

##### 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.

Secure Payment

# 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?

#### We are the Best!

##### 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.

Secure Payment

# 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?

#### We are the Best!

##### 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.

Secure Payment

# 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.

#### We are the Best!

##### 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.

Secure Payment

# 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.

#### We are the Best!

##### 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.

Secure Payment