Sampling methods
A survey in which each member of the population has a chance of being chosen to participate
What is a random sample?
Surveying 1000 people, but getting only 15 responses
What is nonresponse?
A question that can have multiple numerical responses is called _.
What is statistical?
The sum of values divided by the number of items
What is mean?
A small group used to represent an entire group of interest
What is sample?
Surveying every student who has your same lunch
What is convenience sampling?
Asking visitors to a website to complete an online survey
What is undercoverage?
What is the average amount SJC students spend on lunch each day? Statistical or non-statistical? Why?
What is statistical? Answers can vary depending on students asked.
A sample of BUSI 1301's tests has a mean of 89%. If the standard deviation of the scores is 2.4%, what is the margin of error?
What is 4.8%?
Information gathered about every member of a population
What is census?
Writing all students' names on slips of paper then drawing 20 student names from a hat
What is random sample?
The manager of Target surveying customers about their favorite retail store
What is response bias?
How many students at SJC South drove themselves to school today? Statistical or not? Why?
What is non-statistical? There will be one only answer to this question.
The sample proportion of SJC students with tattoos is 5% with a 1.5% margin of error. What is a reasonable range (interval) of students that could have tattoos?
What is between 3.5% and 6.5%?
Additional variable(s) that may confuse the result of an experiment
What is confounding variables?
Sending a Google Form to every student inviting them to complete a survey on dress code
What is voluntary response?
Surveying 5 freshman about the athletic training facilities
What is undercoverage?
A random sample of 15 members of Mrs. McKinleys SJC students in Fall 2025 were surveyed about the safety at SJC. Identify the sample and population in this scenario.
What is sample - 15 members of Mrs. McKinley's mentor group; population - all of SJC students.
What is yes, the value is significant. This implies that the treatment had an effect.
A study in which subjects are watched and data is recorded without any outside influence or change
What is observational?
What is the first step in using a random number generator (RNG) to choose participants in a study?
What is assigning each member of the population a number?
In your own words, describe the meaning of bias.
What is having a tendency toward an opinion, often leading to an unfair or misleading result?
Create your own statistical question.
Hint: is there more than one response that can be given?
An experiment is designed to test the effectiveness of a new drug on patient weight loss. The mean difference between the control group and the treatment group is 3.5 pounds. One hundred-fifty simulations were done. Nine of the simulations had mean differences greater than 3.5. Did the new medication cause increased weight loss? Explain.
What is No, since 9/150 is 0.06 (6%), 3.5lbs is not statistically significant. This result could have happened by chance, not necessarily as a result of the new drug.
When a participant responds positively to a fake treatment
What is placebo effect?