Author Question: A company has developed a new battery, but the average lifetime is unknown. In order to estimate ... (Read 77 times)

theo · **on:** Jun 24, 2018

A company has developed a new battery, but the average lifetime is unknown. In order to estimate this average, a sample of 110 batteries is tested and the average lifetime of this sample is found to be 200 hours. The 200 hours is the value of a:

A) parameter.
B) statistic.
C) sampling frame.
D) population.

Question 2

A professor collected data on the number of absences in an introductory statistics class of 100 students over the course of a semester. The data are summarized below.

Number of Absences 0 1 2 3 4 5 6
Number of Students 5 13 24 23 17 11 7
What is the weighted mean number of absences per semester?
A) 3.14
B) 2.0
C) 2.95
D) 3.07