Author: Anonymous

According to the Chicago Cubs there average attendance at a home game through out the year of 2019 was 38,208 based on attendance at all home games in 2019.  38,208 is a statistic.

A researcher is curious to see if the amount of time spent on social media influences how often friends meet in person to socialize.  After their sample is selected the researcher asks the subjects on average how much time they spend on social media each day and on average how many times per month do they meet in person with their friends to socialize.  What type of study design is this?

Using the following Scatter Plot: Select that statement that is true, that can also be justified by this graphic.

When the sample is selected by breaking the sample up into groups based on a preexisting quality and samples from each of the existing groups, what type of sampling is being done?

A researcher is curious to see if stress level for high school students influences their likelihood of going to college.  So they ask 500 people who attended college what their stress level was in high school and asked 500 people who did not attend college what their stress level was in high school.  What type of study design is this?

A study is observational when the researcher controls the behaviors of their subjects.

If a researcher is given a list of all 51,000 students that go to the university and each student has a 10% chance of being selected to participate in the study, what type of sampling has occurred?

A study is experimental when the researcher lets things happen naturally.

The 50th percentile is also know as what?

It is known that people in the USA spend on average 18 hours a day using electronic devices with a standard deviation of 5.8 hours. This data follows a normal distribution. What is the probability someone spends less than 13 hours using electronic devices a day? (round your answer to 4 decimals)