The campus at Joliet Junior College has a lake. A Secchi dish is employed to measure the clarity of lake's water by lowering the dish in the water and measuring the distance below water till the dish is no longer visible. The following are some of measurements (in inches) which were taken on the lake at many points in time over the course of the year.
|
82
|
64
|
62
|
66
|
68
|
43
|
|
38
|
26
|
68
|
56
|
54
|
66
|
1. Employ the data to evaluate the point estimate. Give the symbol and value.
2. Develop a 90% confidence interval for mean Secchi dish measurement.
3. What is your critical value?