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Questions Grade: 0.9/3 Print Version You are interested in estimating the the mean age of the...
You are interested in estimating the the mean age of the citizens living in your community....
You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 5 years of the actual mean with a confidence level of 94%, how many citizens should be included in your sample? Assume that the standard deviation of the ages...
6. An airline is interested in estimating the mean number of unoccupied seats per flight over...
6. An airline is interested in estimating the mean number of unoccupied seats per flight over the past year. They randomly select 250 flights and count the number of unoccupied seats per flight. The sample mean is 12.2 seats with a sample standard deviation of 3.5 seats. Based on previous studies they know that the population standard deviation is 3.6 seats. (a) Find each of the following quantities. • i= .0= s = n= (b) Use the following steps to...
THIS Quiz: 16 pts possible A decision maker is interested in estimating the mean of a...
THIS Quiz: 16 pts possible A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 99% and the margin of error to be 0.30. She does not know what the population standard deviation is, so she has selected the pilot sample below. Based on this pilot sample, how many more items must be sampled so that the decision maker can make the desired confidence interval estimate?...
Suppose that a researcher is interested in estimating the population mean (Miu_X) of a population with...
Suppose that a researcher is interested in estimating the population mean (Miu_X) of a population with the sample average estimator, X_bar. The population has a population standard deviation of Sigma_X. The question that the research has is: “How large should my sample size be?” You help her out and tell her the following: “Your sample size (n) should be such that there is a 95% chance that the X_bar will be within +/-10% away from the Miu_X.” Based on this...
Suppose that you are interested in estimating the mean amount of soda that is placed in...
Suppose that you are interested in estimating the mean amount of soda that is placed in 2-liter bottles at the local bottling plant of a large nationally known soda company. The bottling plant has informed the inspection division that the standard deviation for 2-liter bottles is .07 liter. A random sample of fifty 2-liter bottles obtained from this bottling plant indicated a sample mean of 2.02 liters. a. What is the point estimate of the population mean? b. Calculate the...
SAT scores are distributed with a mean of 1,500 and a standard deviation of 295. You...
SAT scores are distributed with a mean of 1,500 and a standard deviation of 295. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your confidence interval to 20 points with 90 percent confidence, how many students should you sample? (Round up to a whole number of students.)
You are interested in estimating the proportion of students at OSU who plan to study abroad. ...
You are interested in estimating the proportion of students at OSU who plan to study abroad. You construct a 95% confidence interval based on a survey of a random sample of 125 students, and the interval ends up being from 0.109 to 0.243. If you had instead constructed a 99% confidence interval based on the same sample of data, rather than a 95% confidence interval, how would the center of the interval change? A More information is needed in order...
please show how its done on TI-64 1. SAT scores are distributed with a mean of...
please show how its done on TI-64 1. SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? 3. If n=31, ¯xx¯(x-bar)=36, and s=6, construct a confidence interval at a 98% confidence level. Assume the...
SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300....
SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An administrator at a college is interested in estimating the average SAT score of first-year students. If the administrator would like to limit the margin of error of the 98% confidence interval to 5 points, how many students should the administrator sample? Make sure to give a whole number answer.
An auditing firm is interested in estimating the mean cost out pocket of uniform/work clothing for...
An auditing firm is interested in estimating the mean cost out pocket of uniform/work clothing for employes in the US. They survey SRS of 100 individuals who buy their own work clothing and find that x = 168 and s, = 21 (in USD). (a) State the parameter our confidence interval will estimate. (b) Identify the conditions that must be met to use this procedure, and explain how you know that each one has been satisfied. (c) Find the appropriate...
6. An airline is interested in estimating the mean number of unoccupied seats per flight over the past year. They randomly select 250 flights and count the number of unoccupied seats per flight. The sample mean is 12.2 seats with a sample standard deviation of 3.5 seats. Based on previous studies they know that the population standard deviation is 3.6 seats. (a) Find each of the following quantities. • i= .0= s = n= (b) Use the following steps to...
THIS Quiz: 16 pts possible A decision maker is interested in estimating the mean of a population based on a random sample. She wants the confidence level to be 99% and the margin of error to be 0.30. She does not know what the population standard deviation is, so she has selected the pilot sample below. Based on this pilot sample, how many more items must be sampled so that the decision maker can make the desired confidence interval estimate?...
An auditing firm is interested in estimating the mean cost out pocket of uniform/work clothing for employes in the US. They survey SRS of 100 individuals who buy their own work clothing and find that x = 168 and s, = 21 (in USD). (a) State the parameter our confidence interval will estimate. (b) Identify the conditions that must be met to use this procedure, and explain how you know that each one has been satisfied. (c) Find the appropriate...
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