Course
MATH 225N Statistical Reasoning For The Health Sciences
Week 6 Assignment Confidence Interval for Mean – Population Standard Deviation Known
- Question: The population standard deviation for the number of corn kernels on an ear of corn is 94 If we want to … 90%confident that the sample mean is within 17kernels of the true population mean, what is the minimum sample size that should … taken?
- Question: Suppose the scores of a standardized test are … If the population standard deviation is2 points, what minimum sample size is … 90% confident that the sample mean is within 1 point of the true population mean?
- Question: The length, in words, of the essays written for a contest are … with a population standard deviation of 442words and an unknown population mean. If a random sample of 24 essays is … and results in a sample mean of 1330 words, find a 99% confidence interval for the population mean.
- Question: The lengths, in inches, of adult corn snakes are … with a population standard deviation of 8inches and an unknown population mean. A random sample of 25 snakes is … and results in a sample mean of 58 Identify the parameters … calculate a confidence interval at the 99% confidence level. Then find the confidence interval.
- Question: The lengths, in inches, of adult corn snakes are … with a population standard deviation of8 inches and an unknown population mean. A random sample of 25 snakes is … and results in a sample mean of 58 What is the correct interpretation of the confidence interval?
- Question: The weights, in pounds, of dogs in a city are … with a population standard deviation of 2pounds and an unknown population mean. A random sample of 16 dogs is … and results in a sample mean of 28 Identify the parameters … calculate a confidence interval at the 90% confidence level. Then find the confidence interval….. You may use a calculator or the common z values above. Round the final answer to two decimal places.
- Question: The weights, in pounds, of dogs in a city are … with a population standard deviation of2 pounds and an unknown population mean. A random sample of 16 dogs is … and results in a sample mean of 28 pounds….. What is the correct interpretation of the confidence interval?
- Question: Suppose heights of dogs, in inches, in a city are … and have a known population standard deviation of 7inches and an unknown population mean. A random sample of 15dogs is … and gives a sample mean of 34 Find the confidence interval for the population mean with a 99% confidence level….. z0.10 z0.05 z0.025 z0.01 z0.005… 1.282 1.645 1.960 2.326 2.576…. You may use a calculator or the common z values above. Round the final answer to two decimal places.
- Question: The germination periods, in days, for grass seed are … with a population standard deviation of5 days and an unknown population mean. If a random sample of 17 types of grass seed is … and results in a sample mean of 52days, find a 80% confidence interval for the population mean.
- Question: Suppose scores of a standardized test are … and have a known population standard deviation of 6points and an unknown population mean. A random sample of 22 scores is … and gives a sample mean of 92 Identify the parameters … calculate a confidence interval at the 98% confidence level. Then find the confidence interval….. You may use a calculator or the common z values above.
- Question: Suppose scores of a standardized test are … and have a known population standard deviation of6 points and an unknown population mean. A random sample of 22 scores is … and gives a sample mean of 92 points….. What is the correct interpretation of the 98% confidence interval?
- Question: Suppose the heights of seasonal pine saplings are … If the population standard deviation is 14millimeters, what minimum sample size is … 95%confident that the sample mean is within 4 millimeters of the true population mean?… 101.282z0.051.645z0.0251.960z0.012.326z0.0052.576 ….. Use the table above for the z-score, and … sure to round up to the nearest integer.
- Question: The population standard deviation for the scores of a standardized test is4 If we want to … 90% confident that the sample mean is within 1 point of the true population mean, what is the minimum sample size that should…..
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