You can assume that a representative random sample taken from a population that is known to follow a normal distribution also follows a normal distribution.

Based on the following research question: Is someone more likely to lose weight because they go to they gym at least 4 days per week?   The variable amount of weight lost The variable go to the gym at least 4 days a week

Based on the following research question: Is an interest in playing video games caused by being introduction to STEM fields at an early age?   The variable do you play video games The variable age introduced to STEM fields

It is known that people in the USA spend on average 15 hours a day using electronic devices with a standard deviation of 4.75 hours. This data follows a normal distribution. What is the probability someone spends more than 13 hours using electronic devices a day if it is known that they spend less than 20 hours using electronic devices a day? (round your answer to 4 decimals) (Hint: Normal distribution and conditional probability)

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

It is known that incomes from the USA follow a normal distribution with a mean of $75,000 and a standard deviation of $12,000.  A researcher took a sample of 1000 people in the USA and obtained a sample mean of $57,000 with a standard deviation of $18,000.  What are the characteristics of the sampling distribution.

Based on a sample 100 great white sharks the average length is roughly 15 feet.  15 feet is a statistic.

What is the clinical name of a probability that is used to determine the likelihood of someone having a disease when it is known they have a positive test.

Select all the studies where the explanatory variable is measured first and the outcome variable is measured at a later time point.

Based on the following research question: If an athlete is given an increase in salary will this lead to an increase in the average number of points they score per game?   The variable athlete’s salary The variable average contributing points per game