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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)

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.