Author: Anonymous

Select the best description of IQR.

A variable measured someone’s stress level, the variable has the following values: Not stressed at all, only a little stressed, stressed, and very stressed.   This variable type is [Answer1] This variable’s categorization is [Answer2]

It is known that people in the USA spend on average 17 hours a day using electronic devices with a standard deviation of 7 hours.  This data follows a normal distribution.  What is the probability someone spends exactly 17 hours using electronic devices a day? (round your answer to 4 decimals)

A variable measured the acidic/base balance of a liquid on the pH scale.  The pH scale exists on a range from 0 (extremely acidic) to 14 (extremely basic).   This variable type is [Answer1] This variable’s categorization is [Answer2]

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.

It is known that people in the USA spend on average 17 hours a day using electronic devices with a standard deviation of 7 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)

Based on the following research question: Is an athlete’s salary likely to increase because they contribute a higher average number of points to the team’s score per game?   The variable athlete’s salary [answer1] The variable average contributing points per game [answer2]

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

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 tells half the sample to spend at least 4 hours each day on social media and the other half to spend no more than 4 hours on social media each day.  Then to report back at the end of the month how many times they meet in person with their friends to socialize.  What type of study design is this?

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 parameter.