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Previous Problem List Next (1 point) A random sample of elementary school children in New York...
A random sample of elementary school children in New York state is to be selected to...
A random sample of elementary school children in New York state is to be selected to estimate the proportion ?p who have received a medical examination during the past year. An interval estimate of the proportion p with a margin of error of 0.035 and 99% confidence is required. (a) Assuming no prior information about p^ is available, approximately how large of a sample size is needed? n= b) If a planning study indicates that p^ is around 0.70.7, approximately how large...
Problem 6: [7 points) A New York Times/CBS survey of 224 children of ages 9 to...
Problem 6: [7 points) A New York Times/CBS survey of 224 children of ages 9 to 17 was conducted shortly after the January 28, 1986, space shuttle disaster. Two-thirds of the children said that they would like to travel in space. (a) Give a point estimate of p, the true proportion of children who would like to space travel. [1] (b) Construct a 90% confidence interval for the proportion of children of ages 9 to 17 in 1986 who would...
Question 15 of 30 (1 point) View problem in a pop-up 7.3 Section Exercise 27 Call...
Question 15 of 30 (1 point) View problem in a pop-up 7.3 Section Exercise 27 Call me: A sociologist wants to construct a 98% confidence interval for the proportion of children aged 8-10 living in New York who own a cell phone Part 1 out of 3 A survey by the National Consumers League taken in 2012 estimated the nationwide proportion to be 0.28. Using this estimate, what sample size is needed so that the confidence interval will have a...
Ch8 Sec1: Problem 4 Previous Problem List Next 1 point) Cora wants to determine a 99...
Ch8 Sec1: Problem 4 Previous Problem List Next 1 point) Cora wants to determine a 99 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must she have to get a margin of error less than 0.037 [To find n, use the value p-1/2 for the sample proportion and the values for z" from a z-table or t-table.] Round to the smallest integer that...
Week 10b - Ch23 Comparing Two Proportions: Problem 6 Previous Problem List Next (1 point) (a)...
Week 10b - Ch23 Comparing Two Proportions: Problem 6 Previous Problem List Next (1 point) (a) Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proportions of boys and girls under 10 years old who are afraid of spiders. Assume the 'worst case scenario for the value of both sample proportions. We want a 98% confidence level and for the error to be smaller than 0.07. Answer:...
For this problem, carry at least four digits after the decimal in your calculations. Answers may...
For this problem, carry at least four digits after the decimal in your calculations. Answers may vary slightly due to rounding. What percentage of your campus student body is female? Let p be the proportion of women students on your campus. (a) If no preliminary study is made to estimate p, how large a sample is needed to be 99% sure that a point estimate p̂ will be within a distance of 0.07 from p? (Round your answer up to...
Assume an approximate normal distrihution. IS. A random sample of 12 eniployees of the Wlergate Carpet...
Assume an approximate normal distrihution. IS. A random sample of 12 eniployees of the Wlergate Carpet Company wed an average contribution of $8.00 to the American Cancer Socicty, with a landard deviation of $1.25, Construct u 90% wnfidence interva: for the average contribution by all employces of the Watergate Carpet Company to the American Cancer Society. Assume the contribuions to hc?pproxi- matcly normally distributed. Suction 8.5 16. (a) A random sample of 200 voters from Salem, Virginia, is selected and...
1) Out of 100 people sampled, 60 preferred Candidate A. Based on this, estimate what proportion...
1) Out of 100 people sampled, 60 preferred Candidate A. Based on this, estimate what proportion of the voting population (pp) prefers Candidate A. Use a 99% confidence level, and give your answers as decimals, to three places. _____ < P < ______ 2) You work for a marketing firm that has a large client in the automobile industry. You have been asked to estimate the proportion of households in Chicago that have two or more vehicles. You have been...
Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their...
Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth may be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 30 sets of two-year-old twin boys was taken, and after one week the attention time received was...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school typed an average of 85 words per minute with a standard deviation of 8 words per minute. Assume that the number of words typed per minute of a randomly selected graduates follows a normal distribution 1. (4 pts) a 95% confidence interval to estimate the average number of words typed by all graduates of this school. Remember to state the assumptions and interpret the...
Problem 6: [7 points) A New York Times/CBS survey of 224 children of ages 9 to 17 was conducted shortly after the January 28, 1986, space shuttle disaster. Two-thirds of the children said that they would like to travel in space. (a) Give a point estimate of p, the true proportion of children who would like to space travel. [1] (b) Construct a 90% confidence interval for the proportion of children of ages 9 to 17 in 1986 who would...
Question 15 of 30 (1 point) View problem in a pop-up 7.3 Section Exercise 27 Call me: A sociologist wants to construct a 98% confidence interval for the proportion of children aged 8-10 living in New York who own a cell phone Part 1 out of 3 A survey by the National Consumers League taken in 2012 estimated the nationwide proportion to be 0.28. Using this estimate, what sample size is needed so that the confidence interval will have a...
Ch8 Sec1: Problem 4 Previous Problem List Next 1 point) Cora wants to determine a 99 percent confidence interval for the true proportion of high school students in the area who attend their home basketball games. How large of a sample must she have to get a margin of error less than 0.037 [To find n, use the value p-1/2 for the sample proportion and the values for z" from a z-table or t-table.] Round to the smallest integer that...
Week 10b - Ch23 Comparing Two Proportions: Problem 6 Previous Problem List Next (1 point) (a) Find the size of each of two samples (assume that they are of equal size) needed to estimate the difference between the proportions of boys and girls under 10 years old who are afraid of spiders. Assume the 'worst case scenario for the value of both sample proportions. We want a 98% confidence level and for the error to be smaller than 0.07. Answer:...
Assume an approximate normal distrihution. IS. A random sample of 12 eniployees of the Wlergate Carpet Company wed an average contribution of $8.00 to the American Cancer Socicty, with a landard deviation of $1.25, Construct u 90% wnfidence interva: for the average contribution by all employces of the Watergate Carpet Company to the American Cancer Society. Assume the contribuions to hc?pproxi- matcly normally distributed. Suction 8.5 16. (a) A random sample of 200 voters from Salem, Virginia, is selected and...
Lecture19: Problem 3 Previous Problem List Next (1 point) Studies have suggusted that twins, in their early years, tend to have lower IQs and pick up language more slowly than non-twins. The slower intellectual growth may be caused by benign parental neglect. Suppose it is desired to estimate the mean attention time given to twins per week by their parents. A sample of 30 sets of two-year-old twin boys was taken, and after one week the attention time received was...
For Problem 1 and 2: A random sample of 16 graduates of a certain secretarial school typed an average of 85 words per minute with a standard deviation of 8 words per minute. Assume that the number of words typed per minute of a randomly selected graduates follows a normal distribution 1. (4 pts) a 95% confidence interval to estimate the average number of words typed by all graduates of this school. Remember to state the assumptions and interpret the...
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