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A random sample of the price of gasoline from 30 gas stations in a region gives...
Find a 95% confidence interval for the proportion of gasoline stations with at least one leaking...
Find a 95% confidence interval for the proportion of gasoline
stations with at least one leaking underground tank. Round the
answers to three decimal places.
The 95% confidence interval is ( , ).
How many stations must be sampled so that a 95% confidence
interval specifies the proportion to within ±0.05? (Round up the
final answer to the nearest integer.)
Required information Leakage from underground fuel tanks has been a source of water pollution. In a random sample of 91 gasoline stations,...
Problem 2. The data below gives the mean price (in cents) of a litre of regular...
Problem 2. The data below gives the mean price (in cents) of a litre of regular gasoline at self-service filling stations at a sample of six urban centres in Canada in May 2012. Urban area Halifax Saint John, NB Toronto Thunder Bay Winnipeg Victoria Price/litre 131.5 129.7 128.9 138.2 122.1 131.8 Provide answers to the following to two decimal places. Part (a) Find the sample mean (in cents). Part (b) Find the sample standard deviation (in cents). Part (c) Using...
An automobile club reported that the average price of regular gasoline in a certain state was...
An automobile club reported that the average price of regular gasoline in a certain state was $2.61 per gallon. The following data show the price per gallon of regular gasoline for 15 randomly selected stations in the state. Complete parts a through c below. 2.64 2.72 2.53 2.65 2.57 2.69 2.62 2.51 2.65 2.63 2.56 2.51 2.66 2.62 2.65 a. Construct a 99% confidence interval to estimate the average price per gallon of gasoline in the state. The 99% confidence...
4. There are 200 gas stations in the city. An economist takes a random sample of...
4. There are 200 gas stations in the city. An economist takes a random sample of 50 of them. Their average gasoline price is $ 1.339 per gallon, with a sample standard deviation of 23.1 cents per gallon. Determine an 80-percent confidence interval for the average price citywide, while assuming that the population data is normally distributed
The mean and standard deviation of a random sample of n measurements are equal to 33.4...
The mean and standard deviation of a random sample of n measurements are equal to 33.4 and 3.7 respectively. a. Find a 90% confidence interval for μ if n=121. b. Find a 90% confidence interval for μ if n=484. c. Find the widths of the confidence intervals found in parts a and b. What is the effect on the width of a confidence interval of quadrupling the sample size while holding the confidence coefficient fixed? a. The 90% confidence interval...
A random sample of 87 observations produced a mean -25.8 and a standard deviations 28 a....
A random sample of 87 observations produced a mean -25.8 and a standard deviations 28 a. Find a 95% confidence interval for b. Find a 90% confidence interval for c. Find a 99% confidence interval for a. The 95% confidence interval is ( DD (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed.) b. The 90% confidence intervalis CD (Use integers or decimals for any numbers in the expression. Round to two...
A simple random sample of 40 items resulted in a sample mean of 30. The population...
A simple random sample of 40 items resulted in a sample mean of 30. The population standard deviation is o = 15. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. b. Assume that the same sample mean was obtained from a sample of 90 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places.
A random sample of 88 observations produced a mean x = 25.8 and a standard deviation...
A random sample of 88 observations produced a mean x = 25.8 and a standard deviation s = 2.4. a. Find a 95% confidence interval for . b. Find a 90% confidence interval for . c. Find a 99% confidence interval for pl. a. The 95% confidence interval is ( D. (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed.) b. The 90% confidence interval is C . (Use integers or decimals...
A random sample of 92 observations produced a mean x=25.4 and a standard deviation =2.8. a....
A random sample of 92 observations produced a mean x=25.4 and a standard deviation =2.8. a. Find a 95% confidence interval for μ. b. Find a 90% confidence interval for μ. c. Find a 99% confidence interval for μ. a. The 95% confidence interval is (____.______) (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed b. The 90% confidence interval is (____.______) (Use integers or decimals for any numbers in the...
The mean and standard deviation of a random sample of n measurements are equal to 34.7...
The mean and standard deviation of a random sample of n measurements are equal to 34.7 and 3.2, respectively. a. Find a 90% confidence interval for μ if n=4949. b.Find a 90% confidence interval for μ if n=196. c. Find the widths of the confidence intervals found in parts a and b. What is the effect on the width of a confidence interval of quadrupling the sample size while holding the confidence coefficient fixed? a. The 90% confidence interval for...
Find a 95% confidence interval for the proportion of gasoline
stations with at least one leaking underground tank. Round the
answers to three decimal places.
The 95% confidence interval is ( , ).
How many stations must be sampled so that a 95% confidence
interval specifies the proportion to within ±0.05? (Round up the
final answer to the nearest integer.)
Required information Leakage from underground fuel tanks has been a source of water pollution. In a random sample of 91 gasoline stations,...
Problem 2. The data below gives the mean price (in cents) of a litre of regular gasoline at self-service filling stations at a sample of six urban centres in Canada in May 2012. Urban area Halifax Saint John, NB Toronto Thunder Bay Winnipeg Victoria Price/litre 131.5 129.7 128.9 138.2 122.1 131.8 Provide answers to the following to two decimal places. Part (a) Find the sample mean (in cents). Part (b) Find the sample standard deviation (in cents). Part (c) Using...
4. There are 200 gas stations in the city. An economist takes a random sample of 50 of them. Their average gasoline price is $ 1.339 per gallon, with a sample standard deviation of 23.1 cents per gallon. Determine an 80-percent confidence interval for the average price citywide, while assuming that the population data is normally distributed
A random sample of 87 observations produced a mean -25.8 and a standard deviations 28 a. Find a 95% confidence interval for b. Find a 90% confidence interval for c. Find a 99% confidence interval for a. The 95% confidence interval is ( DD (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed.) b. The 90% confidence intervalis CD (Use integers or decimals for any numbers in the expression. Round to two...
A simple random sample of 40 items resulted in a sample mean of 30. The population standard deviation is o = 15. a. Compute the 95% confidence interval for the population mean. Round your answers to one decimal place. b. Assume that the same sample mean was obtained from a sample of 90 items. Provide a 95% confidence interval for the population mean. Round your answers to two decimal places.
A random sample of 88 observations produced a mean x = 25.8 and a standard deviation s = 2.4. a. Find a 95% confidence interval for . b. Find a 90% confidence interval for . c. Find a 99% confidence interval for pl. a. The 95% confidence interval is ( D. (Use integers or decimals for any numbers in the expression. Round to two decimal places as needed.) b. The 90% confidence interval is C . (Use integers or decimals...
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