What type of probability am i?
EACH WEEK, LEAH BUYS 20 LOTTERY TICKETS. THIS INCREASES HER CHANCE OF WINNING.
THEORETICAL PROBABILITY
YOU WANT TO GATHER INFORMATION ABOUT SHOPPING HABITS. YOU WALK INTO POLO PARK SHOPPING CENTER AND ASK THE FIRST 10 PEOPLE YOU SEE THEIR OPINIONS. WHAT IS THIS TYPE OF SAMPLING CALLED?
CONVENIENCE SAMPLING
YOU WANT TO GATHER DATA ABOUT OBESITY. YOU SURVEY PEOPLE ABOUT THEIR WEIGHT.
PRIVACY
I TOSS A COIN 10 TIMES. WHAT IS THE PROBABILITY IT WILL LAND ON HEADS ON THE 11TH TOSS?
50%
MAYOR YOHN WANTS TO GATHER INFORMATION ABOUT WHETHER HE SHOULD BUILD MORE SPORTS FACILITIES IN WINNIPEG. WHO IS THE TARGET POPULATION?
RESIDENTS OF WINNIPEG
CONNOR REFUSES TO FLY ON AIRPLANES BECAUSE HE DOESN'T THINK THEY'RE SAFE... EVEN THOUGH AIR TRAVEL IS PROVEN TO BE SAFE.
SUBJECTIVE JUDGEMENT
A LOCAL MANUFACTURER WANTS TO TEST ITS PRODUCTS. THEY DECIDE TO TEST EVERY 10TH PRODUCT ON THEIR ASSEMBLY LINE. WHAT TYPE OF SAMPLING IS THIS CALLED?
SYSTEMATIC OR INTERVAL SAMPLING
YOU SURVEYED A GROUP OF PEOPLE IN JULY ABOUT THEIR FAVOURITE BRAND OF SNOWBOARD.
TIMING
THERE ARE 4 ACES IN EVERY DECK OF 52 CARDS. WHAT IS THE PROBABILITY HE WILL RANDOMLY CHOOSE AN ACE?
7.7% or 1/13
APPLE WANTS TO TEST THEIR NEW IPHONE 14s. SHOULD THEY TEST EVERY IPHONE 14? WHY OR WHY NOT.
NO THEY SHOULDN'T. THEY SHOULD TEST RANDOM IPHONE 7'S, THROUGHOUT THE DAY.
HEATHER HAS WON A FREE COFFEE 8 OUT OF 10 TIMES OVER THE PAST WEEK. THERE IS A 80% CHANCE SHE'LL WIN AGAIN.
EXPERIMENTAL PROBABILITY
BEST BUY WANTS TO GATHER CUSTOMER FEEDBACK FROM EACH OF ITS STORES ACROSS CANADA. THEY DECIDE TO ASK 50 CUSTOMERS AT MANY OF THEIR INDIVIDUAL STORES ACROSS CANADA. WHAT KIND OF SAMPLING IS THIS?
STRATIFIED RANDOM SAMPLING
MR SMITH ASKS HIS STUDENTS ABOUT THEIR FAVOURITE BRAND OF CHOCOLATE BAR. HE THEN USES THAT INFORMATION TO SELL HIS STUDENTS THEIR FAVOURITE CHOCOLATE BARS.
ETHICS
I SELECT ONE RANDOM CARD FROM A DECK OF 52 CARDS. WHAT IS THE LIKELIHOOD THAT IT'S A HEART?
25% or 1/4
EVERY YEAR, STATISTICS CANADA CONDUCTS A CENSUS TO GATHER INFORMATION. WHO ARE THEY TARGETING?
CANADIAN CITIZENS
JEFFREY ROLLS A DIE. THERE IS A 50% CHANCE IT WILL LAND ON HEADS.
THEORETICAL PROBABILITY
AN ANNOUNCEMENT IS MADE ASKING ALL THOSE INTERESTED TO COME TO THE OFFICE AND PARTICIPATE IN A QUICK SURVEY. WHAT IS THIS TYPE OF SAMPLING CALLED?
SELF-SELECTED SAMPLING
JOEY WANTS TO GATHER DATA ABOUT HOW HIS CLASSMATES FEEL ABOUT CHRISTMAS. HE ASKS EVERYONE TO EXPLAIN WHY THEY LOVE CHRISTMAS.
CULTURAL SENSITIVITY
KAYLA PICKS 5 MARBLES FROM A BAG. 4 OF THEM WERE RED. WHAT IS THE PROBABILITY THE LAST MARBLE WILL BE RED?
80%
VICTORIA WANTS TO KNOW HOW MANY GRADE 7 TEACHERS TAKE THE BUS TO WORK. WHO IS HER TARGET POPULATION FOR THIS SURVEY?
ALL GRADE 7 TEACHERS
MR HIMES ALWAYS CHOOSES A SEAT AT THE FRONT OF THE PLANE BECAUSE HE KNOWS THEY'RE USUALLY QUIETER.
SUBJECTIVE JUDGEMENT
A LOCAL TELEVISION PROVIDER WANTS TO SURVEY THEIR CUSTOMERS FOR FEEDBACK. THEY DECIDE TO SURVEY EVERY CUSTOMER WHO LIVES IN THE SOUTHEND OF THE CITY. WHAT KIND OF SAMPLING IS THIS CALLED?
CLUSTER SAMPLING
THE PRINCIPAL ASKS STUDENTS THE FOLLOWING QUESTION: "DO YOU LIKE SCHOOL?"
USE OF LANGUAGE
LAST GAME, EMILY SCORED 4 OF THE 7 TOTAL GOALS. WHAT IS THE PROBABILITY SHE WILL SCORE A GOAL DURING THE NEXT GAME?
57% or 4/7
MR MAY WANTS TO ASK STUDENTS ABOUT THEIR FAVOURITE FOODS IN ORDER TO IMPROVE THE MENU AT THE SCHOOL CAFETERIA.
STUDENTS AT YOUR HIGH SCHOOL