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.
Question 2
A car company is interested in testing to see whether the mean miles that a car engine will last without changing oil is the same or different depending on which brand of oil is used.
The engineers also wish to control for the type of transmission (manual or automatic) that is used. To conduct this test, the car company obtains enough engines so that all four oil brands can be tested in a design that involves no replication. Based on this information, how many engines will be needed to conduct the test?A) 4
B) 8
C) One for each oil type
D) One for each factor in the study
Earth’s history is divided into nested sets of time--eons, eras, periods, and epochs--and is called
Telomere length is related to the amount of time adults spend in leisure time activity. Source: Ada
Finding the length given total distance and distance longer than other point
The time spent in each interval of one complete cell cycle of a human cell in culture
An athlete stretches a spring an extra 40.0 cm beyond its initial length. How much energy has ...
A time map of the genes studied in the experiment