joan is researching the IQ of a particular monkey species. She measured the IQ in 15 monkeys with a special monkey IQ test and it turned out to be 120 points on average. The standard deviation was 12...

joan is researching the IQ of a particular monkey species. She measured the IQ in 15 monkeys with a special monkey IQ test and it turned out to be 120 points on average. The standard deviation was 12 points. It can be assumed that the IQ follows a normal distribution. Questions 1 and 2 deal with the experiment.

1. What is the upper limit of the 95% confidence interval for the average monkey species index?


2. 125.46.


3. 113.35.


4. 126.10.


5. 126.65.

1. What is the lower limit of the 95% confidence interval for the variance of the monkey species IQ?

1. 354.18.


2. 12.3.


3. 16.78.


4. 77.18.