Confidence Intervals: A group of 50 randomly selected JWU students have a mean age of 20.5...
Problem 1 The mean age for King's Colege students for a recent Fall term was 30.4. Suppose that 16 Winter students were randomly selected. The mean age for the sample was 32.7 . The sample standard deviation was calculated to be 12 . we are interested in the true mean age for Winter King's College students Collaose A a. (.10) = b. (.10) $12 (20) The standard error for = 95% confidence interval for the sample mean. LL (lower lmit)...
The mean age for all Foothill College students for a recent Fall term was 33.2. The population standard deviation has been pretty consistent at 15. Suppose that twenty-five Winter students were randomly selected. The mean age for the sample was 30.4. We are interested in the true mean age for Winter Foothill College students. Let X= the age of a Winter Foothill College student Construct a 95 % Confidence Interval for the true mean age of Winter Foothill College students...
A sample of 31 students in normally distributed with a mean age of 22.6 years and a standard deviation of 1.6 years. What is the right Chi-square score that would be used to construct a 95% confidence interval for the population standard deviation? Round your answer to two decimal places.
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.7 years of the population mean. Assume the population of ages is normally distributed. (a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.8 years. (b) The sample mean is 20 years of age. Using the minimum sample size with a 90% level of confidence,...
Question 15 8 pts A group of 19 randomly selected students from a state university has a mean age of 22.4 years with a standard deviation of 3.8 years. Use this sample data to construct a 90% confidence interval for the mean age of all students at this university (18.888.25.912) (21.888,22.912) (20.888.23.912) (16.888.27.912)
An admissions director wants to estimate the mean age of all students enrolled at a college. The estimate must be within 1.5 years of the population mean. Assume the population of ages is normally distributed. (a) Determine the minimum sample size required to construct a 90% confidence interval for the population mean. Assume the population standard deviation is 1.6 years. (b) The sample mean is 20 years of age. Using the minimum sample size with a 90% level of confidence,...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 16 students, the mean age is found to be 21.8 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.1 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
A college admissions director wishes to estimate the mean age of all students currently enrolled. In a random sample of 24 students, the mean age is found to be 23.1 years. From past studies, the ages of enrolled students are normally distributed with a standard deviation of 10.6 years. Construct a 90% confidence interval for the mean age of all students currently enrolled. 1. The critical value: 2. The standard deviation of the sample mean: 3. The margin of error:...
The mean age for King's College students for a recent Fall term was 28.8 . Suppose that 21 mean age for the sample was 26.4 . The sample standard deviation was calculated to be 11 Winter King's College students. Winter students were randomly selected. The . We are interested in the true mean age for a. (.10) b. (.10) s= c. (.20) The standard error for x = d.(20) The 1 value for a 95% confidence interval is e. (.20)...
The mean age for King's College students for a recent Fall term was 32.5. Suppose that 16 Winter students were randomly selected. The mean age for the sample was 34.1 . The sample standard deviation equals 10. We are interested in the true mean age for Winter King's College students. a. (3%) b. (396) s = C. (3%) The standard error for x- d. (396) The t value for a 95% confidence interval is e. (396) Construct a 95% confidence...