Calculus and Above

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Construct a​ 99% confidence interval to estimate the
Construct a​ 99% confidence interval to estimate the population mean using the data below. x=23 s=4.5 n=20 N=180 The​ 99% confidence interval for the population mean is ,. ​(Round to two decimal place… read more
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Scott
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A random sample of 375 bolts from machine A contained 41
A random sample of 375 bolts from machine A contained 41 defective bolts, while an independently chosen, random sample of 325 bolts from machine B contained 32 defective bolts. Let p1 be the proportio… read more
Sandhya_sharma
Sandhya_sharma
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Master's Degree
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For this problem, carry at least four digits after the
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding.In a random sample of 60 professional actors, it was found that 39 were e… read more
Scott
Scott
MIT Graduate
Master's Degree
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Any poll of 225 randomly selected US adults, 121 said they
Any poll of 225 randomly selected US adults, 121 said they favored a new proposition. Based on this poll, compute a 95% confidence interval for the proportion of all US individuals in favor of the pro… read more
Kofi
Kofi
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A researcher wishes to estimate the proportion of x-ray
A researcher wishes to estimate the proportion of x-ray machines that malfunction. A random sample of 250 machines is taken, and 57 of the machines in the sample malfunction. Based upon this, compute … read more
Kofi
Kofi
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In a sample of 325 college seniors, 263 responded positively
In a sample of 325 college seniors, 263 responded positively when asked if they had spring fever. Based upon this, compute a 95% confidence interval for the proportion of all college seniors who have … read more
Kofi
Kofi
PhD in Statistics
Ph.D.
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20 years ago, a very famous Psychologist specializing in
20 years ago, a very famous Psychologist specializing in marriage counseling authorize a book detailing the way in which she believes spouses should communicate. She is now interested in the proportio… read more
Kofi
Kofi
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A psychologist wants to estimate the standard deviation of
A psychologist wants to estimate the standard deviation of IQ scores. It is widely believed that the IQ scores follow a normal distribution. Her random sample of 24 IQ scores has a mean of 96.5 and a … read more
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Ann
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Use the sample data and confidence level given below to
Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll, n equals … read more
Kofi
Kofi
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Use the sample data and confidence level given below to
Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll, n equals … read more
Kofi
Kofi
PhD in Statistics
Ph.D.
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Use the sample data and confidence level given below to
Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll, n equals … read more
Kofi
Kofi
PhD in Statistics
Ph.D.
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Use the sample data and confidence level given below to
Use the sample data and confidence level given below to complete parts​ (a) through​ (d). A research institute poll asked respondents if they felt vulnerable to identity theft. In the​ poll, n equals … read more
Kofi
Kofi
PhD in Statistics
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The lifetime of a certain brand of electric light bulb is
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of 45 hours. Suppose that a random sample of 70 bulbs of this brand has a mean lifetime of 495 hours. Find … read more
Kimberley Wright
Kimberley Wright
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Corn: In a prior sample of corn, farmer finds that 12% of
Corn: In a prior sample of corn, farmer Carl finds that 12% of the sample has worms but the margin of error for his population estimate was too large. He wants an estimate that is in error by no more … read more
Sandhya_sharma
Sandhya_sharma
Master's Degree
Master's Degree
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Looking to get some help with my stats homework. Heres a
Hey im looking to get some help with my stats homework … read more
Sandhya_sharma
Sandhya_sharma
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Master's Degree
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Multiple Choice Strategy: Some students have suggested that
Multiple Choice Strategy: Some students have suggested that if you have to guess on a multiple-choice question, you should always choose C. Carl, the student, wants to investigate this theory. He is a… read more
Sandhya_sharma
Sandhya_sharma
Master's Degree
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Estion A sociologist is studying the prevalence of crime in
estionA sociologist is studying the prevalence of crime in one major city. In a sample of 200randomly selected residents, 62say that they have been victimized by a criminal. Based on this sample, cons… read more
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Sandhya_sharma
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Master's Degree
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Suppose that a random sample of 10 adult U.S. males has a
Suppose that a random sample of 10 adult U.S. males has a mean height of 70 inches with a standard deviation of 1.5 inches. If we assume that the heights of adult males in the U.S. are normally distri… read more
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R.R. Jha
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