Here are summary statistics for randomly selected weights of newborn girls: n=242, x= 33.8 hg, s= 7.8 hg. Construct a confidence interval estimate of the mean. Use a 95% confidence level. AreK these results very different from the confidence interval 32.2 hg <µ<35.2 hg with only 20 sample values, x= 33.7 hg, and s=3.3 hg?SView an example Get more help.B2What is the confidence interval for the population mean µ?hg<μOLFIRPcommandClear all. V;IeoptionCheck answer11?|19.1deleteV

Given The data is as follows: n=242x¯=33.8s=7.8CL=0.95

Answered: ← Here are summary statistics for…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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here are summary statistics for randomly weights of newborn girls. n=203, x=32.4hg s=6.4 hg. Construct a confidence interval estimate of the mean. Use a 90% confidence level. Are these results very different from the confidence interval 30.9 hg< <32.9 hg with only 15 sample values, x=31.9 hg and s=2.2hg?
Sally is analyzing wheat production. She sampled 700 wheat farmers from across the state. She found a sample mean of 39 bushels per acre, with a standard deviation of 4.5 bushels. Using a 95% confidence interval, what inference can she make? O The yield per acre of wheat farms in the state ranges from 36.32 to 37.35 bushels. O The yield per acre of wheat farms in the state ranges from 38.67 to 39.33 bushels. O The yield per acre of wheat farms in the state ranges from 42.64 to 46.31 bushels. The yield per acre of wheat farms in the state ranges from 43.86 to 49.52 bushels.
Express the form of most of the confidence intervals that you will encounter in your study of statistics in terms of “point estimate” and “margin of error.”
a sample of 25 automobiles shows that the mean price was $20,500 with standard deviation of $2,500. you may assume the distribution of prices is normal. find a 99% confidence interval if we used a 95% confidence interval, what effect if any would that has on the length of the confidence interval.
In 2012 the General Social Survey asked 845 adults how many years of education they had. The sample mean was 8.44 years with a standard deviation of 8.24 years. (b) Data collected in an earlier study suggest that the mean in 2000 was 6.93 years. A sociologist believes than the mean in 2012 is the same. Does the confidence interval contradict this claim? Explain. The confidence interval (Choose one:does or does not) contradict this belief.
Here are summary statistics for randomly selected weights of newborn girls: n = 167, x= 30.6 hg, s= 6.2 hg. Construct a confidence interval estimate of the mean. Use a 99% confidence level. Are these results very different from the confidence interval 29.2 hg <<32.2 hg with only 13 sample values, x= 30.7 hg, and s= 1.8 hg? What is the confidence interval for the population mean µ? hg
The dean randomly selected 33 students who took the calculus final exam and looked at their scores on it. In this sample the mean was 80.3 and the standard deviation was 3.7. No information about the population's distribution is available. Construct a 98% confidence interval for the mean score of all students who took this exam. Round your answers to 2 places after the decimal point, if necessary. If it is not appropriate to construct a confidence interval in this situation, then enter "0" in both answer boxes below. 98% confidence interval:
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2.3 The width of a confidence interval is a measure of its precision. The narrower the confidence interval, the more precise is the interval estimate, and vice versa. Describe any three aspects that influence the precision of the width of a confidence interval of a single population mean.
Prof. Gersch knows that the score on a standardized test is perfectly normal with unknown mean and a standard deviation of 50. He then takes a random sample of 25 tests and finds that the average of these is 200. Prof. Gersch wishes to make a 95% confidence interval for the average of all the grades.What is the upper end of the confidence interval? a. 220 b. 300 c. 298 d. 225.8 e. 329 f. 219.6
If n= 100 and x= 80, construct a 99% confidence interval. Give your answers to three decimals

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