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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
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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
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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
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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
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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
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Without listing the formula, describe and interpret the components
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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
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Write a paragraph explaining exactly what the term 95 percent
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For expert SCOTT What do confidence intervals represent
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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
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1) A mchine cuts plastic into sheets that are 30 feet 9360
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9) The difference between the sample mean and the population
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Confidence intervals is the range where you expect something
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The birth weights of a SRS of 50 babies born during the previous
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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
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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
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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
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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
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