Question

QUESTION # 1. The measured voltage amounts from a sample of 27 households have a mean of 123.59 volts and a sample standard deviation of 1.38 volt.

1. a) Find a 99% confidence interval to estimate the population mean of the measured voltage amounts for all households in America.

2. b) Write a conclusion.

3. c) Use the TI 84 method to verify the answer.

QUESTION #2. In a Harris poll, adults were asked if they are in favor of abolishing the penny. Among the responses, 161 answered “yes,” 143 answered “no”.

1. a) Construct an 86% confidence interval to estimate the population proportion of the people who answered “yes.”

2. b) Write a conclusion

3. c) Use the TI 84 method to verify the answer.

Answer 1