A farmer surveyed his cattle herd and found that 62 out of the sample 160 cows...
A farmer surveyed his cattle herd and found that 62 out of the sample 160 cows are black. Help the farmer find the 90% confidence interval for the true population of black cows in his herd.
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A farmer surveyed his cattle herd and found that 62 out of the
sample 160 cows...
According to a Field Poll, 400 out of 506 surveyed California adults feel that “education and...
According to a Field Poll, 400 out of 506 surveyed California adults feel that “education and our schools” is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education and the schools are one of the top issues facing California. 1. A point estimate for the true population proportion is: _______________ (Write as a decimal and round to 4 decimal places) 2. The margin...
5. A Consumer Reports survey found that 124 people out of 427 surveyed prefer to purchase...
5. A Consumer Reports survey found that 124 people out of 427 surveyed prefer to purchase books online. Use the steps below to construct a 95% confidence interval to estimate the proportion of all people that prefer to purchase books online. a) What is the sample proportion of people that prefer to purchase books online? b) Find the critical value Za that corresponds to a 95% confidence level. c) Calculate "E" d) Construct your confidence interval. e) Write a sentence...
According to a Field Poll, 400 out of 506 surveyed California adults feel that “education and...
According to a Field Poll, 400 out of 506 surveyed California adults feel that “education and our schools” is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education and the schools is one of the top issues facing California. A point estimate for the true population proportion is: _______________ (Write as a decimal and round to 4 decimal places) The margin of error...
please answer all parts Q1 A school found that 78 out of a random sample of...
please answer all parts
Q1 A school found that 78 out of a random sample of 100 students had read a book in a month. (a) Find a 96% confidence interval for the proportion in the corresponding population. (b) The school has decided that a more precise estimate is needed and wishes to reduce the width of the confidence interval by a quarter. How many more students should be investigated if the school wants to find the 96% confidence interval...
n Exercise 11 A medical researcher surveyed 10 hospitals and found that the standard deviation for...
n Exercise 11 A medical researcher surveyed 10 hospitals and found that the standard deviation for the cost for removing a person's gall bladder was $54. Assume the variable is normally distributed. Based on this, find the 90% confidence interval of the population variance and standard deviation. Round the answers to two decimal places.
A sample of 49 general practicians (GPs) in Queensland hospitals were surveyed and it was found...
A sample of 49 general practicians (GPs) in Queensland hospitals were surveyed and it was found that the average time they had spent with a patient was 20.2 minutes. It is known the standard deviation, for all GPs in Queensland that spend time with a patient, is 5.6 minutes. The lower limit of a 99% confidence interval for the population mean time (in minutes) spent with a patient is estimated to be _____________ (2 decimal places)
A random sample of 30 hotels and motels on a given Sunday in Monterey found the...
A random sample of 30 hotels and motels on a given Sunday in Monterey found the mean to be $100 with population standard deviation $30. Find a 90% confidence interval for the true mean
According to a poll, 76% of California adults (387 out of 506 surveyed) feel that education...
According to a poll, 76% of California adults (387 out of 506 surveyed) feel that education is one of the top issues facing California. We wish to construct a 90% confidence interval for the true proportion of California adults who feel that education is one of the top issues facing California. What is a point estimate for the true population proportion?
An exit poll found that 5,800 out of a sample of 10,000 voters who have a...
An exit poll found that 5,800 out of a sample of 10,000 voters who have a post- graduate education (i.e. attended graduate school) voted for Barack Obama in the 2012 presidential election. Find the 99% confidence interval for the true population proportion of voters with a post-graduate education who voted for Barack Obama.
Five hundred eleven (511) homes in a certain southern California community are randomly surveyed to determine...
Five hundred eleven (511) homes in a certain southern California community are randomly surveyed to determine if they meet minimal earthquake preparedness recommendations. One hundred seventy-three (173) of the homes surveyed met the minimum recommendations for earthquake preparedness and 338 did not. 1) Find the confidence interval at the 90% Confidence Level for the true population proportion of southern California community homes meeting at least the minimum recommendations for earthquake preparedness. ( , ) (Round to the 4th decimal place) 2) State...
5. A Consumer Reports survey found that 124 people out of 427 surveyed prefer to purchase books online. Use the steps below to construct a 95% confidence interval to estimate the proportion of all people that prefer to purchase books online. a) What is the sample proportion of people that prefer to purchase books online? b) Find the critical value Za that corresponds to a 95% confidence level. c) Calculate "E" d) Construct your confidence interval. e) Write a sentence...
please answer all parts
Q1 A school found that 78 out of a random sample of 100 students had read a book in a month. (a) Find a 96% confidence interval for the proportion in the corresponding population. (b) The school has decided that a more precise estimate is needed and wishes to reduce the width of the confidence interval by a quarter. How many more students should be investigated if the school wants to find the 96% confidence interval...
n Exercise 11 A medical researcher surveyed 10 hospitals and found that the standard deviation for the cost for removing a person's gall bladder was $54. Assume the variable is normally distributed. Based on this, find the 90% confidence interval of the population variance and standard deviation. Round the answers to two decimal places.
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