Construct the indicated confidence interval for the population mean p using the t-distribution. Assume the population is normally distribute c= 0.98, x= 14.1, s=0.68, n= 12
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- A researcher collected sample data for 17 women ages 18 to 24. The sample had a mean serum cholesterol level (measured in mg/100 mL) of 188.4, with a standard deviation of 9.2. Assuming that serum cholesterol levels for women ages 18 to 24 are normally distributed, find a 90% confidence interval for the mean serum cholesterol level of all women in this age group. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.Assume researchers are trying to find out the mean concentration levels of a specific drug in a population of individuals’ blood during a clinical trail. The researchers find that the sample population of 30 has a mean concentration of 6.7 mcg/mL with a standard deviation of 1.3 mcg/ mL. Calculate a 95% confidence interval for the mean concentration level of the medication for the population’s blood and interpret it.You are a data analyst for a health insurance company and want to estimate the population mean of the surgery durations for all heart valve patients. To do so, you select a random sample of 32 heart valve surgery patients, and you record the surgery duration for each. Assume it is known that the population standard deviation of the durations of all heart valve surgeries is 1.92 hours. Based on your sample, follow the steps below to construct a 99% confidence interval for the population mean of the surgery durations for all heart valve patients. (If necessary, consult a list of formulas.) (a) Click on "Take Sample" to see the results from your random sample of 32 heart valve patients. (b) Take Sample Sample size: 0 Point estimate: 0 Population standard deviation: 0 Critical value: 0 Compute 0.00 0.00 Number of patients 32 Enter the values of the sample size, the point estimate for the population mean, the population standard deviation, and the critical value you need for your 99%…
- One year, the mean age of an inmate on death row was 40.1 years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects 32 death-row inmates and finds that their mean age is 39.3, with a standard deviation of 9.9. Construct a 95% confidence interval about the mean age. What does the interval imply? Click the icon to view the table of critical t-values. C Choose the correct hypotheses. Ho: ▼ H₁₂: (Type integers or decimals. Do not round.) Construct a 95% confidence interval about the mean age. years and years. (Round to two decimal places as needed.) With 95% confidence, the mean age of a death row inmate is between What does the interval imply? O A. Since the mean age from the earlier year is not contained in the interval, there is not sufficient evidence to conclude that the mean age had changed. O B. Since the mean age from the earlier year is contained in the interval, there is sufficient evidence to conclude that the mean age…How large of a sample is required for a to construct a 99% confidence interval around a mean with an error of less than 1.5. Assume the standard deviation is 42.Age Differences In a large hospital, a nursing director selected a random sample of 43 registered nurses and found that the mean of their ages was 31.5. The population standard deviation for the ages is 4.5. She selected a random sample of 32 nursing assistants and found the mean of their ages was 29.7. The population standard deviation of the ages for the assistants is 5.3. Find the 95% confidence interval of the differences in the ages. Use μ1 for the mean age of the nursing assistants. Round the answers to at least one decimal place. Use a TI-83 Plus/TI-84 Plus calculator. ? < μ1- μ2 < ?
- A researcher is interested in studying the use of hypnosis to relieve pain. She took a random sample of 16 subjects and measured their sensory ratings. The mean of the sensory ratings was found to be 7.5 and standard deviation to be 2.3. It is known that the sensory ratings are normally distributed. Construct a 99% confidence interval for the mean sensory ratings of the population. a) (5.81, 9.19) b) (6.27, 8.73) c) (6.36, 8.64) d) (6.02, 8.98)The Pizza Shop wanted to determine what proportion of its customers ordered only cheese pizza. Out of 80 customers surveyed, 15 ordered cheese pizza. They want a 99% confidence interval of the true proportion of customers who order only cheese pizza. Which type of confidence interval should we use here? a confidence interval for the mean using a table value from the standard normal distribution. a confidence interval for the mean using a table value from the t distribution. a confidence interval for a proportion using a table value from the standard normal distribution. a confidence interval for proportion using a table value from the t distribution.The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the two rear wheels of eight cars and runs the cars until the tires wear out. The data (in kilometers) follow. Find a 99% confidence interval on the difference in the mean life. Car Brand 1 Brand 2 1 36,925 34,318 2 45,300 42,280 3 36,256 35.548 4 32,100 31,950 5 37,210 38,015 6 48,360 47,800 7 38.200 37,810 8 33,500 33,215 Round your answer to 2 decimal places. Do not use commas.a sociologist found that in a sample of 45 retired men, the average number of jobs they had during theirlifetimes was 7.2. The population standard deviation is 2.3.Find the 90% confidence interval of the mean number of jobs. Round intermediate and final answers to one decimalplace.<h<Assume the height of men is normally distributed. A random sample of 25 men had an average height of 72.5 with a sample standard deviation of 4.0. Form a 95% confidence interval on the population mean. 5.One year, the mean age of an inmate on death row was 38.1 years. A sociologist wondered whether the mean age of a death-row inmate has changed since then. She randomly selects 32 death-row inmates and finds that their mean age is 36.9, with a standard deviation of 9.8. Construct a 95% confidence interval about the mean age. What does the interval imply? A Click the icon to view the table of critical t-values. Choose the correct hypotheses. Но (Type integers or decimals. Do not round.)SEE MORE QUESTIONS