choosing measured of central tendency and dispersion

Question 1

nominal

Answer 1

central tendency- MODE

dispersion- n/a

Question 2

ordinal

Answer 2

central tendency- median

dispersion- range

Question 3

interval

Answer 3

central tendency-mean

dispersion- standard deviation

Question 4

HOW TO DO THE TEST

Answer 4

1) state test
2) state calculated value
3) state N (or other) and level of significance at one or two tailed
4) state if calculated must be more/ less than critical
4) null or alternative hypothesis accepted/ rejected?