ologist reports a confidence interval of (2.2,4.0) when estimating the mean height (in centimeters) of a sample öf seedlings e estimated margin of error is
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- An investigator conducts a study to investigate whether there is a difference in mean peak expiratory flow (PEF) in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Construct a 95% confidence interval for the mean PEF in children without chronic bronchitis. b. How many children would be required to ensure that the margin of error in (a) does not exceed 10 units? What is the margin of error? Group # Children Mean PEF Std Dev PEF Chronic Bronchitis 25 281 68 No Chronic Bronchitis 25 319 74 a. 95% CI ( , )An applicant must have a systolic blood pressure in the 50% of the metal range. If the systolic blood pressure is normally distributed with a mean of 120 and a standard deviation of four find the upper and lower limits of blood pressure a person must have to qualify for the studyDetermine the margin of error in estimating the population mean, μ. Based on a sample of size 45, a 99% confidence interval for the mean score of all students, μ, on an aptitude test is from 75 to 83. Find the margin of error.
- What method is used for interpreting the standard deviation that applies to data that have a bell shape distributionThe height of a species of tree is normally distributed with population standard deviation 5ft. How big of a sample of trees would be needed to keep the margin of error below 2ft for a 90% confidence interval for the mean?The total of individual weights of garbage discarded by 17 households in one week is normally distributed with a mean of 32.9 lbs with a sample standard deviation of 9.7 lbs. Find the 99% confidence interval of the mean.
- A researcher wants to estimate the mean blood cholesterol level of young men ages 15-25 with a 94.35% confidence interval. The blood cholesterol level of young men follows a Normal distribution with standard deviation σσ = 50 mg/dl. How large a sample would the researcher need to take to estimate the mean blood cholesterol to within 15 mg/dl?The pH of rain, measured at a weather station in Michigan, was observed for 39 consecutive rain storms. The sample mean is 4.6982 and the sample variance is 0.39623. Obtain a 99% confidence interval for the mean pH of the population of storms at that location.In a clinical test with 500 subjects, 2500 showed improvement from the treatment. find the margin of error for the 99% confidence interval used to estimate the population proportion find the margin of error E that corresponds to the given statistics and confidence level
- Find a 98% confidence interval for the true mean length of eyelashes, if a sample 33 eyelashes has a mean length of 13.3 millimeters, with a standard deviation of 3.6. (by hand)A random sample of 30 adult bottlenose dolphin was found to have a mean weight of 550 pounds with a standard deviation of 50 pounds. What will be the Margin of Error (Maximum Error of Estimate) for a 98% confidence level? Round the answer to 2 decimal placesAn automobile manufacturer needs to estimate the average highway fuel economy (miles per gallon) for a new truck that will be sold starting next year. A random sample of 63 trucks were tested for highway fuel economy and the sample had a mean of 27.1 miles per gallon with a standard deviation of 1.3 miles per gallon.Using a 95% confidence level, determine the margin of error,E, and a confidence interval for the average highway fuel economy of this new truck. Report the confidence interval using interval notation. Round solutions to two decimal places, if necessary.The margin of error is given by E=.A 95% confidence interval is given by