MATH 221B - L24 Quiz Group Meeting Biostatistics. Questions and Answers.
Question 1
1 / 1 pts
I met with my group and completed this Group Quiz with
... [Show More] them.
Correct!
True
Question 2
1 / 1 pts
Which of the following variables is/are quantitative? (Mark all that apply.)
The telephone number of a randomly selected business in town.
The 3 most common brands of car found in the US.
Correct!
The number of people in a randomly selected classroom on campus.
Question 3
1 / 1 pts
Students in an Introductory Statistics class at BYU-Idaho were studying prices
of cold cereal at grocery stores in Rexburg. To get a sample of cold cereal
prices, they went to Albertson's and rolled a die to decide which box from the
left of the top shelf they would start on. They then recorded every 6th cereal
after the first, moving from left to right down the shelves, recording the
name, size, and price of each cereal in their sample. Is this study an
experiment or an observational study, and why?
An observational study, because the students had no control over which
cereals were selected.
Correct!
An observational study, because the students had no control over the price
of the individual cereals.
An experiment, because the students had control over which sampling
method they used.
An experiment, because the students had control over which cereals would
be selected for the study.
Question 4
1 / 1 pts
For a Math 221 project, one group of students studied the ages of students
on the BYU-Idaho campus. They collected data from a random sample
of n=100 students. The sample mean was 21.2 and the sample standard
deviation was 2.61. An excerpt of their data is given below.
The group notices an error in their data. The age of one of the males (ID=3)
was entered incorrectly. He is actually 21 years old. When the error is
corrected, what will happen to the sample median?
The median will increase.
The median will decrease.
Correct!
It is not possible to determine this without the full data set.
The median will stay the same.
Question 5
1 / 1 pts
The time to complete a standardized exam in the BYU-Idaho Testing Center is
approximately normal with a mean of 70 minutes and a standard deviation of
10 minutes. Using the 68-95-99.7 rule, approximately what percentage of
students will complete the exam in under fifty minutes? Give your answer
accurate to one decimal place. (Example: 24.7)
Correct!
Correct Answers
2.5 (with margin: 0.0)
Question 6
1 / 1 pts
The scores on the LSAT are approximately normal with mean of 150.7 and
standard deviation of 10.2. (Source: www.lsat.org.) Queen's School of
Business in Kingston, Ontario requires a minimum LSAT score of 157 for
admission.
Find the 35th percentile [Show Less]