Answer:
The 95% confidence interval for the population proportion of people who believe the governor broke campaign financing laws is (33%, 39%).
Explanation:
The (1 - α) % confidence interval for population proportion is:
For a 95% confidence interval the critical value of z is:
The sample proportion is,
and the sample size is, n = 900.
Compute the 95% confidence interval for the population proportion of people who believe the governor broke campaign financing laws as follows:
The 95% confidence interval for the population proportion of people who believe the governor broke campaign financing laws is (33%, 39%).
The null hypothesis can be defined as:
H₀: More than 38% of all U.S. citizens favor that viewpoint, i.e. p > 0.38.
As the 95% confidence interval consists of the null value so it can concluded that fewer than 38% of all U.S. citizens favor that viewpoint.