A real estate agent records the ages of 50 randomly

Question

1. A simple random sample of 50 adults Is obtained and each person's red blood cell count is measured (in microliters). The sample mean is 4.63. The population standard deviation for red blood cell counts is .54. Construct a 99% confidence interval estimate of the mean red blood cell count of adults.

2. What percentage of a normal distribution is within 2 standard deviations of the mean? (Select the closest answer.)

a. 50%
b. 95%
c. 75%
d. 100%

3. The area under the standard normal distribution between -2.5 and 1.5 is
a. 0.1338
b. 0.1668
c. 0.4332
d. None of the above

4. A real estate agent records the ages of 50 randomly selected home buyers in her sales area. The mean age is 38 years, with a sample standard deviation of 8 years.

a. Find a 99% confidence interval for the population mean age.

5. A simple random sample of 120 SAT scores has a mean of 1520. Assume that SAT scores have a standard deviation of 300. Construct a 95% confidence interval estimate of the mean SAT score.

Answer 1

Properly read all statistics problem and on the basis of requirements, answer the following questions by following the APA instructions. Q1. A simple arbitrary sample of 50 adults is obtained and each and every person's red blood cell count is measured (in micro liters). The sample mean equals 4.63. The population standard deviation for the red blood cell counts is .54. Prepare a 99% confidence interval estimation of the mean red blood cell count of the adults. Q2. A real estate agent records the ages of 50 arbitrarily chosen home buyers in her sales area. The mean age is 38 years, having a sample standard deviation of 8 years. a) Determine 99% confidence interval for the population mean age. Q3. A simple arbitrary sample of 120 SAT scores consists of a mean of 1520. Suppose that SAT scores encompass a standard deviation of 300. Prepare a 95% confidence interval estimate of the mean SAT score.