Load data
1. Using the variable “sleptim1” and “marital”, determine the
following:
1.1 number of observations that are “NA” in the variable
“sleptim1”;
1.2 number of observations having at most 5 hours of sleep;
1.3 number of observations having more than 5 hours of sleep but
less than 11 hours of sleep;
1.4 number of observations having at least 11 hours of sleep
and
1.5 number of observations having at most 5 hours of sleep that are
married.