Calculus and Above

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Determine the sample size n needed to construct a 90​%
Determine the sample size n needed to construct a 90​% confidence interval to estimate the population proportion when p=0.68 and the margin of error equals 8​%.At its peak after the 2007–2008 ​recessi… read more
Kofi
PhD in Statistics
Ph.D.
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A psychologist is interested in the mean IQ score of a given
A psychologist is interested in the mean IQ score of a given group of children. It is known that the IQ scores of the group have a standard deviation of 14. The psychologist randomly selects 70 childr… read more
Tom
Master's Degree
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A random sample of 200 adults was given a IQ test. It was
A random sample of 200 adults was given a IQ test. It was found that 118 of them scored higher than 100. Based on this compute a 90% confidence interval for the proportion of all adults whose IQ score… read more
Tom
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The Gallup organization conducted a phone survey from June
The Gallup organization conducted a phone survey from June 9-12, 2011. Researchers at Gallup chose a random sample of 961 American adults. The 1020 American adults were asked to respond to the followi… read more
DebdattaBhattacharya
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Constructing a Confidence Interval for a Population
Constructing a Confidence Interval for a Population Proportion In a random sample of 500 U.S. adults, 78% said that they believe that the U.S. Congress fails to pass laws that benefit the lives of all… read more
Kofi
PhD in Statistics
Ph.D.
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1.What two things can be changed in order to create a more
1.What two things can be changed in order to create a more narrow confidence interval?2. What proportion of adults use their cellphones within one hour of waking up in the morning? To estimate this un… read more
Kofi
PhD in Statistics
Ph.D.
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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
Master's Degree
Master's Degree
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Pinworm: In a random sample of 830 adults in the U.S.A., it
Pinworm: In a random sample of 830 adults in the U.S.A., it was found that 80 of those had a pinworm infestation. You want to find the 95% confidence interval for the proportion of all U.S. adults wit… read more
Sandhya_sharma
Master's Degree
Master's Degree
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A doctor wants to estimate the HDL cholesterol of all​ 20-
A doctor wants to estimate the HDL cholesterol of all​ 20- to​ 29-year-old females. How many subjects are needed to estimate the HDL cholesterol within 3 points with 99 % confidence assuming sigma equ… read more
Sandhya_sharma
Master's Degree
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12) To build a 95% interval estimate proportion of
12) To build a 95% interval estimate for the proportion of Indiana adult population who are obese, a random sample of 420 Hoosier adults yielded a sample proportion of . The standard error of sample p… read more
Ryan
Bachelor's Degree
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FOR MR. WHITE b. Interpret the interval in terms of this application.
FOR MR. WHITE b. Interpret the interval in terms of this application. Choose the correct answer below: A. The water department can be 90% confident that the mean lead level of drinking water for all r… read more
Stevewh
Teacher
Bachelor's Degree
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Let p be the population proportion for the following condition.
Let p be the population proportion for the following condition. Find the point estimates for p and q. In a survey of 1543 adults from country A, 641 said that they were not confident that the food the… read more
Math-John
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Please help with these 17 questions!! 1. Find the margin of error for the given values of c,s,and n. c=0.90,s=2.9,n=100 2. Construct the confidence interval for the population mean u. c=0.98,x=8.4,s=0… read more
Chirag
Master's Degree
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Find the margin of error for the given values of c, s, and
Find the margin of error for the given values of c, s, and n. C=0.95, s=2.3, n=49 E=_________ (Round to three decimal places as needed) Construct the confidence interval for the population mean µ. C= … read more
Stevewh
Teacher
Bachelor's Degree
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16. In a survey of 630 males ages 18-64, 391 say they have
16. In a survey of 630 males ages 18-64, 391 say they have gone to the dentist in the past year. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and com… read more
Sandhya_sharma
Master's Degree
Master's Degree
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Find the margin of error for the given values of c, s, and
Find the margin of error for the given values of c, s, and n. C=0.90, s=3.9, n=49 E=_________ (Round to three decimal places as needed) Construct the confidence interval for the population mean µ. C= … read more
Chirag
Master's Degree
10,329 satisfied customers
Suppose that a 95% confidence interval for a population mean
Suppose that a 95% confidence interval for a population mean μ is given to be from 130 to 150. The 95% value in this statement indicates that: (choose the one best answer) a. P ( 130 < μ < 150 )… read more
Osbert12
Master's Degree
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1.Assume that the weight loss for the first month of a diet
1.Assume that the weight loss for the first month of a diet program varies between 6 pounds and 12 pounds, and is spread evenly over the range of possibilities, so that there is a uniform distribution… read more
SusanAthena
Master's Degree
Master's Degree
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