The following table is a summary of a random sample from all individuals who were first

elected to the U.S. House of Representatives in the Years 1910-1960.

Age at First Election (in years) Number of Congressmen

25 up to but not including 35 5

35 up to but not including 45 40

45 up to but not including 55 35

55 up to but not including 75 20

(a) What is the data collecting method?

(b) What is the population from which the sample was selected?

(c) What is the variable of interest?

(d) What is the type of this variable?

(e) What is the sample size?

(f) What is the percentage of congressmen who were younger than 45 years when they

were first elected?

(g) What is the percentage of congressmen who are 35 years or older when they were first

elected?

(h) What is the age of the oldest (youngest) congressman ever elected? Explain.

(i) What is the percentage of congressmen whose ages at first election are greater than

or equal to 35 but less than 55 years?