HCD 300 EXAM QUESTIONS AND
ANSWERS ALL CORRECT
When sampling based on the proportion of subgroups of interest we use:
- Simple random sample
- Stratified random sample
- Systematic random sample
- Multistage cluster sample - Answer- Stratified random sample
Given the following values of r, which is the strongest?
- 0.72
- (-0.25)
- 0.6
- (-0.88) - Answer- -0.88 (strongest regardless of direction - positive/negative)
T/F: Samples should be biased in order to represent the population - Answer- F
***A large health care organization wants to explore wellness by randomly selecting 5
locations then surveying all
- Simple random sample
- Stratified random sample
- Systematic random sample
- Multistage cluster sample - Answer- multistage cluster sample
This sample ensures every element has an equal chance of being selected form the
population:
- simple random sample
- stratified random sample
- systematic random sample
- multistage cluster sample - Answer- simple random sample
These visualizations are helpful for solving probability problems:
- scatterplot
- contingency table (2x2 table)
, - probability tree
- box plot - Answer- contingency table (2x2 table), probability tree
Given r = 0.82, which of the following describes the relationship?
- as x increases, y decreases
- as x decreases, y increases
- as x increases, y increases
- as x decreases, y decreases - Answer- as x increases, y decreases and
as x decreases, y increases (if it's a negative value, as one goes up the other one goes
down or as one goes down the other one goes up - the x and y are inverse)
***As r approaches 0, how would we describe the relationship?
- strong
- medium
- very strong
- weak - Answer- weak
Reasons to use a convenience sample:
- save time
- save money
- I am lazy
- it is the gold standard of sampling - Answer- Save time, save money
T/F: The probability of flipping heads two times in a row is = 0.5 + 0.5 - Answer- F (can't
be addition because flipping heads two times in a row is 100% chance if it's a 1 -
probability is calculated by multiplying those two values)
The probability of drawing two cards from a deck and both being jacks (no replacing
cards)
- 4/52
- (4/52)*(4/52)
- (4/52)*(3/51) - Answer- (4/52)*(3/51) (because removing one card from deck makes
the amount in the deck 51, not 52)
The probability of rolling either a 1 or a 2 on one roll of a die?
- (1/6)+(1/6)
- (2/6)
- (1/6)*(1/6) - Answer- (1/6)+(1/6) or
(2/6)
ANSWERS ALL CORRECT
When sampling based on the proportion of subgroups of interest we use:
- Simple random sample
- Stratified random sample
- Systematic random sample
- Multistage cluster sample - Answer- Stratified random sample
Given the following values of r, which is the strongest?
- 0.72
- (-0.25)
- 0.6
- (-0.88) - Answer- -0.88 (strongest regardless of direction - positive/negative)
T/F: Samples should be biased in order to represent the population - Answer- F
***A large health care organization wants to explore wellness by randomly selecting 5
locations then surveying all
- Simple random sample
- Stratified random sample
- Systematic random sample
- Multistage cluster sample - Answer- multistage cluster sample
This sample ensures every element has an equal chance of being selected form the
population:
- simple random sample
- stratified random sample
- systematic random sample
- multistage cluster sample - Answer- simple random sample
These visualizations are helpful for solving probability problems:
- scatterplot
- contingency table (2x2 table)
, - probability tree
- box plot - Answer- contingency table (2x2 table), probability tree
Given r = 0.82, which of the following describes the relationship?
- as x increases, y decreases
- as x decreases, y increases
- as x increases, y increases
- as x decreases, y decreases - Answer- as x increases, y decreases and
as x decreases, y increases (if it's a negative value, as one goes up the other one goes
down or as one goes down the other one goes up - the x and y are inverse)
***As r approaches 0, how would we describe the relationship?
- strong
- medium
- very strong
- weak - Answer- weak
Reasons to use a convenience sample:
- save time
- save money
- I am lazy
- it is the gold standard of sampling - Answer- Save time, save money
T/F: The probability of flipping heads two times in a row is = 0.5 + 0.5 - Answer- F (can't
be addition because flipping heads two times in a row is 100% chance if it's a 1 -
probability is calculated by multiplying those two values)
The probability of drawing two cards from a deck and both being jacks (no replacing
cards)
- 4/52
- (4/52)*(4/52)
- (4/52)*(3/51) - Answer- (4/52)*(3/51) (because removing one card from deck makes
the amount in the deck 51, not 52)
The probability of rolling either a 1 or a 2 on one roll of a die?
- (1/6)+(1/6)
- (2/6)
- (1/6)*(1/6) - Answer- (1/6)+(1/6) or
(2/6)
