In a random sample of 500 BCTC students, 120 students are between ages 25 and 34 years old. What is the high end of a 90% confidence interval for the proportion of all BCTC students who are between 25 and 34 years old? Enter your answer as a decimal rounded to 4 decimal places.

In a random sample of 500 BCTC students, 120 students are between ages 25 and 34 years old. What is the low end of a 90% confidence interval for the proportion of all BCTC students who are between 25 and 34 years old? Enter your answer as a decimal rounded to 4 decimal places.

In a random sample of 500 BCTC students, 120 students are between ages 25 and 34 years old. What is the sample proportion of BCTC students who are between 25 and 34 years old? Enter your answer as a decimal with 2 decimal places.

In a random sample of 100 fish from the Kentucky River, the mean mercury content was determined to be 0.287 parts per million (ppm). We know that the standard deviation for mercury content in all fish is 0.069 ppm.

What is the high end of a 95% confidence interval for the mean mercury content of all fish in the Kentucky River? Round your answer to 4 decimal places.

In a random sample of 100 fish from the Kentucky River, the mean mercury content was determined to be 0.287 parts per million (ppm). We know that the standard deviation for mercury content in all fish is 0.069 ppm.

What is the low end of a 95% confidence interval for the mean mercury content of all fish in the Kentucky River? Round your answer to 4 decimal places.

In a random sample of 100 fish from the Kentucky River, the mean mercury content was determined to be 0.287 parts per million (ppm). We know that the standard deviation for mercury content in all fish is 0.069 ppm.

What is the margin of error of a 95% confidence interval for the mean mercury content of all fish in the Kentucky River? Round your answer to 4 decimal places.

Identify the z score used in the calculation of a 99% confidence interval.

1.28

1.645

1.96

2.58