Homework Answers
Width of CI = 
If we reduce confidence level then z-value will get reduce. Hence width will reduce.
Option D) It will get narrower. is the answer for this.
I hope this will help. Thank you.
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< webworkorwin-stat200-spring2020ecture19 Lecture19: Problem 8 Previous Problem List Next (1 point) You have only one chance...
Lecture19: Problem 6 Previous Problem List Next (1 point) You have only one chance at this...
Lecture19: Problem 6 Previous Problem List Next (1 point) You have only one chance at this problem. To estimate the average SAT score of incoming freshmen, the Admissions office collected the scores of fifty randomly chosen students. From previous years, they know that the population standard deviation will be 27.5. Should they use a z-interval or a t-interval, or do they not have enough information to use either? A. They should use a z-interval B. They do not have enough...
Lecture19: Problem 7 Previous Problem List Next (1 point) You have only one chance at this...
Lecture19: Problem 7 Previous Problem List Next (1 point) You have only one chance at this problem. The Admissions office collected the SAT scores of fifty randomly chosen students, from which they found a standard deviation of 27.5. If they wish to construct a 95% confidence interval for the average score for all students, should they use a z-interval or a t-interval, or do they not have enough information to use either? A. They should use a z-interval B. They...
Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90%...
Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90% confidence interval for the mean of a population with o = 24.2, given that a sample of size 50 had a mean of 52.5. Confidence interval: Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
Lecture19: Problem 4 Previous Problem List Next (1 point) 1Q tests are designed so that the...
Lecture19: Problem 4 Previous Problem List Next (1 point) 1Q tests are designed so that the mean is 100 points and the standard deviation is 15 points for the entire adult population. What is the minimum sample size needed to estimate the average IQ of all Stat 200 students to within 3 points with 96% confidence? Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
Lecture19: Problem 2 Previous Problem List Next (1 point) John measured the total playing time of...
Lecture19: Problem 2 Previous Problem List Next (1 point) John measured the total playing time of 25 randomly chosen CDs from his very large collection and found a mean of 65.2 minutes and a standard deviation of 11.4 minutes. Give the 97% confidence interval for the population mean, assuming that the population is approximately normally distributed. Round the endpoints to two decimal places. Confidence interval:( Note: You can earn partial credit on this problem. Note: You can get a new...
Lecture19: Problem 5 Previous Problem List Next (1 point) A long history of testing water samples in a certain lake...
Lecture19: Problem 5 Previous Problem List Next (1 point) A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 4.9 mg/L. What is the minimum number of samples required to estimate today's level to with in 0.6 mg/L with 91% confidence? ZC = 1.7 n = 193 Note: You can get a new version of this problem after the due date. Preview My...
both answers listed are incorrect Lecture19: Problem 2 Previous Problem List Next Attempt Results Entered Answer Pre...
both answers listed are incorrect
Lecture19: Problem 2 Previous Problem List Next Attempt Results Entered Answer Preview 60.25 60.25 70.15 70.15 At least one of the answers above is NOT correct. (1 point) John measured the total playing time of 25 randomly chosen CDs from his very large collection and found a mean of 65.2 minutes and a standard deviation of 11.4 minutes. Give the 97% confidence interval for the population mean, assuming that the population is approximately normally distributed....
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...
Lecture18: Problem 5 Previous Problem List Next (1 point) The systolic blood pressure (SBP) of a...
Lecture18: Problem 5 Previous Problem List Next (1 point) The systolic blood pressure (SBP) of a certain population is normally distributed with standard deviation 5 mmHg. A sample of 25 members of this population was found to have an average SBP of 118 mmHg. Find a 90% confidence interval for the population mean. Round the endpoints to the nearest integer. Confidence interval is Note: You can earn partial credit on this problem. Note: You can get a new version of...
Lecture19: Problem 11 Previous Problem List Next (1 point) The following data represents the number of days a rando...
Lecture19: Problem 11 Previous Problem List Next (1 point) The following data represents the number of days a random sample of patients spent in the hospital after being admitted with a dangerous virus. 20 22 22 19 22 25 21 21 24 23 Assuming that the number of days in the hospital is normally distributed, find a 90 % confidence interval for the population mean based on this sample. Give the end points of your interval to three decimal places.
Lecture19: Problem 6 Previous Problem List Next (1 point) You have only one chance at this problem. To estimate the average SAT score of incoming freshmen, the Admissions office collected the scores of fifty randomly chosen students. From previous years, they know that the population standard deviation will be 27.5. Should they use a z-interval or a t-interval, or do they not have enough information to use either? A. They should use a z-interval B. They do not have enough...
Lecture19: Problem 7 Previous Problem List Next (1 point) You have only one chance at this problem. The Admissions office collected the SAT scores of fifty randomly chosen students, from which they found a standard deviation of 27.5. If they wish to construct a 95% confidence interval for the average score for all students, should they use a z-interval or a t-interval, or do they not have enough information to use either? A. They should use a z-interval B. They...
Lecture19: Problem 10 Previous Problem List Nest (1 point) Compute, to three decimal places, a 90% confidence interval for the mean of a population with o = 24.2, given that a sample of size 50 had a mean of 52.5. Confidence interval: Note: You can earn partial credit on this problem. Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
Lecture19: Problem 4 Previous Problem List Next (1 point) 1Q tests are designed so that the mean is 100 points and the standard deviation is 15 points for the entire adult population. What is the minimum sample size needed to estimate the average IQ of all Stat 200 students to within 3 points with 96% confidence? Note: You can get a new version of this problem after the due date. Preview My Answers Submit Answers
Lecture19: Problem 2 Previous Problem List Next (1 point) John measured the total playing time of 25 randomly chosen CDs from his very large collection and found a mean of 65.2 minutes and a standard deviation of 11.4 minutes. Give the 97% confidence interval for the population mean, assuming that the population is approximately normally distributed. Round the endpoints to two decimal places. Confidence interval:( Note: You can earn partial credit on this problem. Note: You can get a new...
Lecture19: Problem 5 Previous Problem List Next (1 point) A long history of testing water samples in a certain lake has shown that the level of a certain pollutant is approximately normally distributed with standard deviation 4.9 mg/L. What is the minimum number of samples required to estimate today's level to with in 0.6 mg/L with 91% confidence? ZC = 1.7 n = 193 Note: You can get a new version of this problem after the due date. Preview My...
both answers listed are incorrect
Lecture19: Problem 2 Previous Problem List Next Attempt Results Entered Answer Preview 60.25 60.25 70.15 70.15 At least one of the answers above is NOT correct. (1 point) John measured the total playing time of 25 randomly chosen CDs from his very large collection and found a mean of 65.2 minutes and a standard deviation of 11.4 minutes. Give the 97% confidence interval for the population mean, assuming that the population is approximately normally distributed....
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...
Lecture18: Problem 5 Previous Problem List Next (1 point) The systolic blood pressure (SBP) of a certain population is normally distributed with standard deviation 5 mmHg. A sample of 25 members of this population was found to have an average SBP of 118 mmHg. Find a 90% confidence interval for the population mean. Round the endpoints to the nearest integer. Confidence interval is Note: You can earn partial credit on this problem. Note: You can get a new version of...
Lecture19: Problem 11 Previous Problem List Next (1 point) The following data represents the number of days a random sample of patients spent in the hospital after being admitted with a dangerous virus. 20 22 22 19 22 25 21 21 24 23 Assuming that the number of days in the hospital is normally distributed, find a 90 % confidence interval for the population mean based on this sample. Give the end points of your interval to three decimal places.
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