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.