Homework Answers
Answer
Using TI 84 calculator
Select STAT, then TESTS and select TInterval
this gives
Upper limit = 279 (rounded to nearest integer)
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Question 5 (1 point) A random sample of 40 videos posted to YouTube was selected. A...
Confidence Intervals for Mean SD Unkown ia Pittman: Attempt 1 Question 5 (1 point) A random...
Confidence Intervals for Mean SD Unkown ia Pittman: Attempt 1 Question 5 (1 point) A random sample of 40 videos posted to YouTube was selected. A month later, the number of times that each had been viewed was tabulated. The mean number of viewings was 82 with a sample standard deviation of 297 . Find the upper bound of the 99% confidence interval for the mean number of times videos posted to YouTube have been viewed in the first month....
Question 4 A company has developed a new type of light bulb, and wants to estimate...
Question 4 A company has developed a new type of light bulb, and wants to estimate its mean lifetime. A simple random sample of 12 bulbs had a sample mean lifetime of 651 hours with a sample standard deviation of 43 hours. It is reasonable to believe that the population is approximately normal. Find the lower bound of the 95% confidence interval for the population mean lifetime of all bulbs manufactured by this new process. Round to the nearest integer....
Question 7 (4.2 points) A simple random sample of electronic components will be selected to test...
Question 7 (4.2 points) A simple random sample of electronic components will be selected to test for the mean lifetime in hours. Assume that component lifetimes are normally distributed with population standard deviation of 20 hours. How many components must be sampled so that a 99% confidence interval will have margin of error of 6 hours? Write only an integer as your answer. Question 8 (5 points) Six measurements were made of the mineral content (in percent) of spinach, with...
Question 9 (4 points) A college admissions officer takes a simple random sample of 104 entering...
Question 9 (4 points) A college admissions officer takes a simple random sample of 104 entering freshmen and computes their mean mathematics SAT score to be 471. Assume the population standard deviation is 121. What is the lower bound of the 99% confidence interval? Round your answer to the nearest integer. Write only a number as your answer.
The upper bound is ___ A simple random sample of size n = 40 is drawn...
The upper bound is ___
A simple random sample of size n = 40 is drawn from a population. The sample mean is found to be x = 120.2 and the sample standard deviation is found to be s = 12.7. Construct a 99% confidence interval for the population mean. The lower bound is . (Round to two decimal places as needed.)
Question 13 (5 points) Scientists want to estimate the mean weight of mice after they have...
Question 13 (5 points) Scientists want to estimate the mean weight of mice after they have been fed a special diet. From previous studies, it is known that the weight is normally distributed with standard deviation 5 grams. How many mice must be weighed so that a 95% confidence interval will have margin of error of 0.5 grams? Write only an integer as your answer. Your Answer: Answer Question 17 (5 points) In the computer game World of Warcraft, some...
A simple random sample of size n=40 is drawn from a population. The sample mean is...
A simple random sample of size n=40 is drawn from a population. The sample mean is found to be x overbar equals 120.7 and the sample standard deviation is found to be s=12.1. Construct a 99% confidence interval for the population mean. The lower bound is ________ (Round to two decimal places as needed.) The upper bound is ________ (Round to two decimal places as needed.)
A simple random sample of size n=40 is drawn from a population. The sample mean is...
A simple random sample of size n=40 is drawn from a population. The sample mean is found to be x overbar equals 120.7 and the sample standard deviation is found to be s=12.1. Construct a 99% confidence interval for the population mean. The lower bound is ________ (Round to two decimal places as needed.) The upper bound is ________ (Round to two decimal places as needed.)
#25 A simple random sample of size n equals 40 is drawn from a population. The...
#25 A simple random sample of size n equals 40 is drawn from a population. The sample mean is found to be x overbar equals 121.3 and the sample standard deviation is found to be s equals 12.2. Construct a 99% confidence interval for the population mean. The lower bound is nothing. (Round to two decimal places as needed.) The upper bound is nothing. (Round to two decimal places as needed.)
Use the sample data and confidence level given below to complete parts (a) through (d) A...
Use the sample data and confidence level given below to complete parts (a) through (d) A drug is used to help prevent blood clots in certain patients. In cinical trials, among 4779 patients treated win the drug, 126 developed the adverse reaction of nausea Construct a 90% confidence interval for the proportion of adverse reactions a) Find the best point estimate of the population proportion (Round to three decimal places as needed.) b) Identity the value of the margin of...
Confidence Intervals for Mean SD Unkown ia Pittman: Attempt 1 Question 5 (1 point) A random sample of 40 videos posted to YouTube was selected. A month later, the number of times that each had been viewed was tabulated. The mean number of viewings was 82 with a sample standard deviation of 297 . Find the upper bound of the 99% confidence interval for the mean number of times videos posted to YouTube have been viewed in the first month....
Question 7 (4.2 points) A simple random sample of electronic components will be selected to test for the mean lifetime in hours. Assume that component lifetimes are normally distributed with population standard deviation of 20 hours. How many components must be sampled so that a 99% confidence interval will have margin of error of 6 hours? Write only an integer as your answer. Question 8 (5 points) Six measurements were made of the mineral content (in percent) of spinach, with...
Question 9 (4 points) A college admissions officer takes a simple random sample of 104 entering freshmen and computes their mean mathematics SAT score to be 471. Assume the population standard deviation is 121. What is the lower bound of the 99% confidence interval? Round your answer to the nearest integer. Write only a number as your answer.
The upper bound is ___
A simple random sample of size n = 40 is drawn from a population. The sample mean is found to be x = 120.2 and the sample standard deviation is found to be s = 12.7. Construct a 99% confidence interval for the population mean. The lower bound is . (Round to two decimal places as needed.)
Question 13 (5 points) Scientists want to estimate the mean weight of mice after they have been fed a special diet. From previous studies, it is known that the weight is normally distributed with standard deviation 5 grams. How many mice must be weighed so that a 95% confidence interval will have margin of error of 0.5 grams? Write only an integer as your answer. Your Answer: Answer Question 17 (5 points) In the computer game World of Warcraft, some...
Use the sample data and confidence level given below to complete parts (a) through (d) A drug is used to help prevent blood clots in certain patients. In cinical trials, among 4779 patients treated win the drug, 126 developed the adverse reaction of nausea Construct a 90% confidence interval for the proportion of adverse reactions a) Find the best point estimate of the population proportion (Round to three decimal places as needed.) b) Identity the value of the margin of...
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