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Wize University Statistics Textbook > Collecting Data & Sampling

Introduction to Statistics

5 Activities

In a sample of 90 students selected at random, 33 claim that they procrastinate in studying for a statistics exam. An estimate of the proportion of all students that rocrastinate in studying for a statistics exam is
More Introduction to Statistics Questions:
Classifying Variables
In a study of students at Eastern University, they recorded the number of classes a student missed, their sex, their program of study, their overall grade percent average, and on a scale of 1 to 10 how satisfied they were with food on campus.
How many categorical variables are in this study?
How many quantitative variables are in this study?
Classifying Variables
In a study of students at Eastern University, they recorded the number of classes a student missed, their sex, their program of study, their overall grade percent average, and on a scale of 1 to 10 how satisfied they were with food on campus.
How many categorical variables are in this study?
How many quantitative variables are in this study?
Statistical parameters
A lab wants to test out a new drug called EYE-C for improving eyesight. They randomly sampled 100 subjects with poor eyesight and split them into two even groups. Each subject in Group 1 took the drug and each subject in Group 2 took a placebo. The subjects do not know which one they took; neither do the lab technicians. Results: 40 subjects in Group 1 reported improved eyesight, while 30 subjects in Group 2 reported improved eyesight.
The population is:
The statistics are:
Sampling
You wish to calculate the proportion of a sample of students that use social media regularly. This is an example of
Principles of Statistics
A survey from 2020 gathered data on 500 different Uber cars in Toronto, listing each car's mileage (in km), make and model (62 of them), age (in years), and colour (8 of them). Which of the following is considered a "what" in this question.
i. Uber cars
ii. Uber cars in Toronto
Introduction to Statistics
120 STAT 151 students participated in a study designed to evaluate the new menu at a restaurant in the student center. The students were asked to visit this restaurant on 3 different occasions and order 3 different items from the new menu. They were then asked to give the new menu a rating out of 10, and the average rating was 8.8. What is this 8.8 number called?
Principles of Statistics
Which of the following statements is FALSE?
Classifying Variables
In a study of students at Eastern University, they recorded the number of classes a student missed, their sex, their program of study, their overall grade percent average, and on a scale of 1 to 10 how satisfied they were with food on campus.
How many categorical variables are in this study?
How many quantitative variables are in this study?
Statistical parameters
A study on wellbeing and stress of university students is conducted. The researcher drew a random sample of 5 departments on campus. Then he randomly sampled 100 students within each department that was selected and handed them the link to his online survey. Ultimately, only 30% of the sample responded. Amongst those who responded, 120 of them say they feel stressed.
(b) What is the parameter of interest?
Statistics: Practice
There are 600 Sephora locations in the United States. Christine randomly selected 40 stores, and then she randomly selected 100 customers from each of those stores. Less than 1% of her sample identified as heterosexual males. Based on her sample, the average spending at Sephora is $45. In addition, 340 customers in her sample revealed that they have VIB Rouge status, which the highest tier status that is reached when a customer spends $1,000 in a calendar year.
Population and sampling
An urban planner want to know how bad the commute is for people live in Twin Pines and drive to Downtown to work full-time jobs. Devices are used to count many times they brake their cars along Highway #1 from Twin Pines to Downtown during rush hour. About 70% of Twin Pines residents that work full-time Downtown and drive by car are homeowners; 30% are renters. A random sample is drawn from each group.
What is the population of interest?