## Construct an approximate 68% confidence interval for the average height of all students in the school.

Question 1 A random sample of 400 people is taken from all people in a city. The ages of the sampled people have an average of 35 years and an SD of 20 years. Is the interval “33 years to 37 years” an approximate 95% confidence interval for the average age of the people in the city. Question 2 A random sample of 100 students is taken from among all students at a large school. The average height of the students in the sample is 66 inches and the SD is 2.5 inches. Construct an approximate 68% confidence interval for the average height of all students in the school.

### consider doing a market research study to forecast demand for the office units prior to beginning construction.

Dante Development Corporation is considering bidding on a contract for a new office building complex. Figure 4.17 shows the decision tree prepared by one of Dante’s analysts. At node 1,….

### Test the claim that there is a difference in times between two trials.

Mental measurements of young children are often made by giving them blocks and telling them to build a tower as tall as possible. One experiment of block building was repeated….

### Identify the distribution of X—name and parameter(s).

1. When local calls are made in NYC, 60% go through on the first try, and the rest get a busy signal. (We assume there is no third possibility). Let….