1 An airline wants to evaluate the depth perception of its p

1. An airline wants to evaluate the depth perception of its pilots over the age of fifty. A random sample of n = 14 airline pilots over the age of fifty are asked to judge the distance between two markers placed 20 feet apart at the opposite end of the laboratory. The population standard deviation is 1.4. The sample data listed here are the pilots’ error (recorded in feet) in judging the distance. 2.9 2.6 2.9 2.6 2.4 1.3 2.3 2.2 2.5 2.3 2.8 2.5 2.7 2.6 a) (1 point) What is the sample mean? (Use either SPSS or a calculator.)

Solution

Getting the mean, X,          
          
X = Sum(x) / n          

Here, summing,

Sum(x) =    34.6      

As n =    14      

Thus,          

X =    2.471428571   [ANSWER]