The Manager of an Online Shop Wants to Determine Whether

question 68

Multiple Choice

The manager of an online shop wants to determine whether the mean length of calling time of its customers is significantly more than 3 minutes. A random sample of 100 customers was taken. The average length of calling time in the sample was 3.1 minutes with a standard deviation of 0.5 minutes. At a 0.05 level of significance, it can be concluded that the mean of the population is:

• A) significantly greater than 3.
• B) not significantly greater than 3.
• C) significantly less than 3.
• D) not significantly different from 3.10.

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Definitions:

Flatworm

Bilaterally symmetrical invertebrate with organs but no body cavity; for example, a planarian or tapeworm.

Simple Diffusion

The movement of molecules from an area of higher concentration to an area of lower concentration without the need for energy or a carrier.

Digestive System

The series of organs and glands responsible for the breakdown and absorption of food to extract necessary nutrients.

Respiratory System

The network of organs and tissues that help you breathe, including the lungs, trachea, and nasal passages.