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Section 10.1. Q12. SAT Scores. A simple random sample of SAT
Section 10.1. Q12. SAT Scores. A simple random sample of SAT scores is obtained, and the population has a distribution that is approximately normal. The sample statistics are n =41, sample mean (x bar… read more
Trigeoscal
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Master's Degree
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Find the minimum sample size N needed to estimate u for the
Find the minimum sample size N needed to estimate u for the given values c,s and E. c=.95, s=7.6, and E=2 N= You are given the sample mean and the sample standard deviation. Use this information to co… read more
Chirag
Master's Degree
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A researcher wishes to calculate the level of blood alcohol
A researcher wishes to calculate the level of blood alcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC levels. He randomly selects records for 1400 … read more
Stevewh
Teacher
Bachelor's Degree
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Without listing the formula, describe and interpret the components
Without listing the formula, describe and interpret the components of a “Confidence Interval for the Mean”.… read more
Chirag
Master's Degree
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Given the 95% confidence interval (75.23 3.16) for a population
Given the 95% confidence interval (75.23 ± 3.16) for a population mean, rewrite in the following alternative format with left and right endpoints: (__________,___________) Would a given mean value of … read more
Ryan
Bachelor's Degree
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Without listing the formula, describe and interpret the components
Without listing the formula, describe and interpret the components of a “Confidence Interval for the Mean”.… read more
Chirag
Master's Degree
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a random sample of 90 observations produced a mean of 25.9
a random sample of 90 observations produced a mean of 25.9 and a standard deviation of 2.7 a) find an approximate 95% confidence interval for the population mean. b) find an approximate 90% confidence… read more
Scott
Master's Degree
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Write a paragraph explaining exactly what the term 95 percent
Write a paragraph explaining exactly what the term "95 percent confidence" means in hte context of calculating a 95 percent confidence interval for a population mean… read more
Chirag
Master's Degree
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For expert SCOTT What do confidence intervals represent
For expert SCOTT: What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval? What percentage of times will the me… read more
Scott
Master's Degree
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1). What effect does increasing sample size, n, have on the
1). What effect does increasing sample size, n, have on the estimate of the mean? Why is the population shape a concern when estimating a mean? If you knew the population was skewed, what could you do… read more
R.R. Jha
Bachelor's Degree
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1) A mchine cuts plastic into sheets that are 30 feet 9360
1) A mchine cuts plastic into sheets that are 30 feet 9360 inches) long. Assume that the population of lengths is normally distributed. The company wants to estimate the mean lenth the machine is cutt… read more
Osbert12
Master's Degree
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9) The difference between the sample mean and the population
9) The difference between the sample mean and the population mean is called the A. Population standard deviation. B. Sampling error. C. Standard error of the mean. D. Population mean. 10) A confidence… read more
David
Post-Doctoral Degree
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Confidence intervals is the range where you expect something
Confidence intervals is the range where you expect something to be.If you use a confidence intervals of 4 and 47%of your sample picks an answer you can be sure if you had asked the entire population b… read more
SusanAthena
Master's Degree
Master's Degree
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The birth weights of a SRS of 50 babies born during the previous
The birth weights of a SRS of 50 babies born during the previous year at a nearby hospital are analyzed. The mean birth weight is determined to be 8.04 lb. Assume that all birth weights from babies bo… read more
R.R. Jha
Bachelor's Degree
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5. The test scores for 12 randomly selected high school seniors
5. The test scores for 12 randomly selected high school seniors are shown below 1426 1221 984 692 725 831 722 748 547 624 1449 945 Assume the population is normally distributed. Find the sample mean x… read more
abozer
Bachelor's Degree
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1.You are given the sample mean and the standard deviation.
***Statistics**Need the answers by 8pmEST 5/27/09******** 1.You are given the sample mean and the standard deviation. use this information to construct the 90% and 95% confidence intervals for the pop… read more
Greg
Master's Degree
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1)You are constructing a 95% confidence interval using the
1)You are constructing a 95% confidence interval using the following information: n = 60, = 65.5, s = 2.5, and E = 0.7. What is the value of the middle of the interval? 2)A researcher is interested in… read more
abozer
Bachelor's Degree
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Second time posting. no answer yet. Just trying again
When estimating a population mean with a confidence interval estimate, then E is: A) equal to the level of confidence. B) one-half the width of the confidence interval. C) a multiple of the population… read more
abozer
Bachelor's Degree
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