Osteoarthritis
In a random sample of 1800 persons aged 65 and over, the proportion with osteoarthritis was found to be 0.225 (or 22.5%).
a. What is the standard error for the estimate of the proportion of all person aged 65 and over with osteoarthritis?
b. Find the margin of error, using a 95% confidence level, for estimating this proportion.
c. Report the 95% confidence interval for the proportion of all persons of aged 65 and over with osteoarthritis.
d. According to patient.info, 50% of all persons aged 65 and over have osteoarthritis. Does the confidence interval you found in part c support or refute this claim? Explain.