STAT 30100-013 Elementary Statistical Methods Fall 2018 Homework -1 Due: 09/06/2
ID: 3068167 • Letter: S
Question
STAT 30100-013 Elementary Statistical Methods Fall 2018
Homework -1 Due: 09/06/2018
A Health Study conducted on a sample of 500 women revealed that women who eat a cup of beta carotene-rich food a day have 30% fewer strokes and 25 % fewer heart attacks than those who consume a quarter of a cupful per day.
What is the population of this study?
What is the sample of this study?
What is the response variable?
d) What is the explanatory variable?
Classify the variable as qualitative or quantitative.
the colors of book covers on a bookshelf
the number of calls received at emergency call center
the bank account numbers of the students in a class
the weights of cases loaded onto an airport conveyor belt
GPA of students in a class.
Determine whether the quantitative variable is discrete or continuous
the weight of a player on the wrestling team
the low temperature in degrees Fahrenheit on January 1st in Chicago
the number of goals scored in a hockey game
the number of pills in an aspirin bottle
the speed of a car on a Indiana tollway during rush hour traffic
Determine the level of measurement of the variable
the medal received (gold, silver, bronze) by an Olympic gymnast
height of a tree
student’s favorite sport
the year of manufacture of a car
time spent playing basketball
. Which sampling method is used
A sample consists of every 30th worker from a group of 1000 workers.
A) stratified B) simple random C) cluster D) convenience E) systematic
A researcher randomly selects 60 of the nation’s community hospitals and interviews all of the patients with pneumonia
A) stratified B) simple random C) cluster D) convenience E) systematic
A market researcher randomly selects 100 homeowners under 60 years of age and 200 homeowners over 60 years of age
A) stratified B) simple random C) cluster D) convenience E) systematic
Every fifth adult entering an airport is checked for extra security screening
A) stratified B) simple random C) cluster D) convenience E) systematic
The names of 30 employees are written on 30 cards. The cards are placed in a bag, and three names are picked from the bag.
Explanation / Answer
1) a)Population is all the women who eat a cup of beta carotene-rich food a day
B) sample is the 500 women who eat beta carotene rich food a day
C)The response variable is the focus of a question in a study or experiment. An explanatory variable is one that explains changes in that variable.
The response variable is the number of strokes or heart attack happening to a women who eat beta carotene rich food a day
D) the explanatory variable here is whether a women is tqking a full cup or a quarter of the cup of Beta carotene rich food a day
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