Question

In a survey of 68 US females, 56 said they had gone to the dentist within the past year. What is the UPPER endpoint of a 95% confidence interval for the population proportion?

Answer 1

To find the upper endpoint of a 95% confidence interval for the population proportion, you can use the formula: p + z ∗ sqrt((p(1−p))/n).

Step-by-step explanation:

To find the upper endpoint of a 95% confidence interval for the population proportion, we can use the formula:

p + z ∗ sqrt((p(1−p))/n)

where p is the sample proportion (56/68), z is the z-score corresponding to a 95% confidence level (which is approximately 1.96 for a large sample), and n is the sample size (68). Plugging in the values, we get:

56/68 + 1.96 ∗ sqrt((56/68)(1−56/68)/68) = 0.8235

So, the upper endpoint of the 95% confidence interval for the population proportion is 0.8235.