We draw a random sample of size 25 from a normal population with a known variance of 2.4. If the sample mean is 12.5, what is the Lower Confidence Limit for the 95% confidence interval for the population mean? Include 1 decimal place in your answer
We draw a random sample of size 25 from a normal population with a known variance...
Question 14 1 pts We draw a random sample of size 25 from a normal population with variance 2.2. If the sample mean is 18.5, what is a 90% lower limit confidence interval for the population mean?
2. When drawing a random sample from a normal population with known variance o?, we have the equation for 100(1 – a)% confidence interval for the population mean as ī+ 2a/20/Vn (a) What value of Za/2 gives 95% confidence? (b) What value of Za/2 gives 98% confidence? (c) What value of 20/2 gives 80% confidence?
A simple random sample of size 64 is drawn from a normal population with a known standard deviation σ. The 95% confidence interval for the population mean μ is found to be (12, 16). The approximate population standard deviation σ is:
We have a random sample of size 17 from the normal distribution N(u,02) where u and o2 are unknown. The sample mean and variance are x = 4.7 and s2 = 5.76 (a) Compute an exact 95% confidence interval for the population mean u (b) Compute an approximate (i.e. using a normal approximation) 95% confidence interval for the population mean u (c) Compare your answers from part a and b. (d) Compute an exact 95% confidence interval for the population...
QUESTION 9 It is known that the variance of a population equals 1444. A random sample of 100 observations is going to be taken from the population. Compute the margin of error corresponding to a 96% level of confidence. NOTE: WRITE YOUR ANSWER WITH 4 DECIMAL DIGITS. DO NOT ROUND UP OR DOWN. QUESTION 12 The average score of a sample of 100 senior business majors at UTC who took the Graduate Management Admission Test was 530 with a variance...
We draw a random sample of size 100 from a population with standard deviation 5. If the sample mean is 36, what is a 95% confidence interval for the population mean? Select one: [35.1775, 36.8225] b. [35.02,36.98] c. [34.712, 37.288] d. [35.17, 36.83)
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s', is determined to be 13.2. Complete parts (a) through (c). (a) Construct a 90% confidence interval for o2 if the sample size, n, is 20. The lower bound is 8.32 . (Round to two decimal places as needed.) The upper bound is 24.79. (Round to two decimal places as needed.) (b) Construct a 90% confidence interval for...
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s?, is determined to be 13.2. Complete parts (a) through (c). (a) Construct a 90% confidence interval for o2 if the sample size, n, is 20. The lower bound is (Round to two decimal places as needed.)
A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s?, is determined to be 13.2. Complete parts (a) through (c). (a) Construct a 90% confidence interval for o2 if the sample size, n, is 20. The lower bound is - (Round to two decimal places as needed.)
A simple random sample of size n is drawn from a population that is normally distributed. The sample mean, x, is found to be 113, and the sample standard deviation, s, is found to be 10 (a) Construct a 95% confidence interval about if the sample size, n, is 25. (b) Construct a 95% confidence interval about if the sample size, n, is 13 (c) Construct a 90% confidence interval about if the sample size, n, is 25. (d) Could...