A Random Sample of 18 Observations Is Taken from a Normal

question 3

Multiple Choice

A random sample of 18 observations is taken from a normal population. The sample mean and sample standard deviation are 76.4 and 4.2, respectively. What is an 80% interval estimate of the population variance?

• A) [12.107, 29.735]
• B) [10.870, 34.581]
• C) [12.819, 31.484]
• D) [14.636, 23.443]

---

Definitions:

Pest-Resistant

A characteristic of plants that have the ability to withstand or repel attacks from pests, reducing the need for chemical pesticides.

Gene Flow

The movement of alleles between local populations due to the migration of individuals; can have significant evolutionary consequences.

Herbicide-Tolerant Weeds

Weeds that have developed resistance to herbicides, making them difficult to control in agricultural settings.

Herbicide-Tolerant Plants

Genetically modified or selectively bred plants that possess the ability to survive and reproduce after exposure to herbicides aimed at killing weeds.