To select a random sample, first classify the population into groups of similar individuals, then choose a separate SRS in each group and combine these SRS to form the full sample.

To select a stratified random sample, first classify the population into groups of similar individuals, then choose a separate SRS in each group and combine these SRS to form the full sample

Step-by-step explanation:

Stratified random sampling involved dividing the population into small groups of similar individuals (called strata) and then from among those groups, a stratified random sample is selected and then, all these samples are combined to form the full sample. Hence, the missing word in this sentence is stratified.

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.