Question

The estimation of the average shrinkage percentage of plastic clay should have an error bound of...

The estimation of the average shrinkage percentage of plastic clay should have an error bound of 0.2 with 95% confidence. From prior sampling, an estimated standard deviation is 1.2.

1. Use R to determine this sample size. Do they match well? Paste your R code.

Homework Answers

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
To estimate the mean of a normal population whose standard deviation is 6, with a bound...
To estimate the mean of a normal population whose standard deviation is 6, with a bound on the error of estimation equal to 1.2 and confidence level 99% requires a sample size of at least: a.166b b.167 c.13 d.None of these choices
4. Find the margin of error E. In a random sample of 151 college students, 84...
4. Find the margin of error E. In a random sample of 151 college students, 84 had part-time jobs. Find the margin of error E for the 95% confidence interval used to estimate the population proportion. Round your answer to four decimal places. Answer 0.0792 5. Find the minimum sample size required to estimate the population proportion p: Margin of error: 0.10; confidence level: 95%; from a prior study, is known to be 66%. 6. Find the minimum sample size...
The average return on stock market investments is an annual percentage rate of 10%.  Construct a 95%...
The average return on stock market investments is an annual percentage rate of 10%.  Construct a 95% confidence interval for the Columbus fund whose average annual return on investment has been 12% per year with a standard deviation of 15% and sample size of 18 years. 5.84% - 18.15% 4.54% - 19.45% 1.75% - 22.24% 10% - 15%
A parent believes that the average height for 14 year old girls differs from that of...
A parent believes that the average height for 14 year old girls differs from that of 14 year old boys. The summary data are listed below where height is in feet: the sample mean of 5.1 and the population standard deviation of 0.2 based on a random sample of size 40 from 14 year old girls. What are the point estimate and the margin of error with 95% confidence level?
A political candidate has asked you to conduct a poll to determine what percentage of people...
A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 1% margin of error at a 98% confidence level, what size of sample is needed? The political candidate will need to sample____ people. Assume that a sample is used to estimate a population mean μμ. Find the 95% confidence interval for a sample of size 38 with a mean of 44.3 and a standard deviation of...
1.Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is...
1.Assume that the helium porosity (in percentage) of coal samples taken from any particular seam is normally distributed with true standard deviation σ = 0.8. A sample of 13 specimens from the seam produces average porosity 4.6. The 90% confidence interval for the true average of helium porosity is: (4.316    ,    4.884) (4.235    ,    4.965) (4.205    ,    4.995) Tries 0/2 What is the minimum sample size required to estimate the true average porosity within...
The average time for a plastic bottle to completely degrade in a landfill is reported to...
The average time for a plastic bottle to completely degrade in a landfill is reported to be 500 years[1]. Data on estimated time of degradation (in years) were collected from samples subject to respirometry tests[2], and were recorded in ‘prob set 7 data.csv’. What is the mean value observed for time of degradation? What is the standard error observed for time of degradation? Find the 95% confidence intervals for the unknown population mean time of degradation and interpret its meaning....
A random sample of 10 drivers reported the below average mileage in the city for their...
A random sample of 10 drivers reported the below average mileage in the city for their cars. 18, 21, 24, 25, 25, 25, 25, 26, 29, & 31 The mean of the sample is 24.9 miles per gallon, with an associated standard deviation of about 3.6. Find the 95% confidence interval for the average mileage of the cars for all of the drivers in the class. Assume all normality conditions apply. Determine the approximate sample size needed to estimate the...
A consumer research group is interested in testing an automobile manufacturer’s claim that a new economy...
A consumer research group is interested in testing an automobile manufacturer’s claim that a new economy model will travel at least 25 miles per gallon of gasoline. Provide a null and alternative hypothesis for the test. Suppose a test on 25 cars of this model indicates an average of 24 mpg, with a sample standard deviation of 3 mpg. Compute the value for the test statistic and the p-value. Please copy your R code and the result and paste them...
A political candidate has asked you to conduct a poll to determine what percentage of people...
A political candidate has asked you to conduct a poll to determine what percentage of people support him. If the candidate only wants a 4% margin of error at a 97.5% confidence level, what size of sample is needed? When finding the z-value, round it to four decimal places. You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable preliminary estimation for the population proportion. You would like to be...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT