It is known that people in the USA spend on average 15 hours…

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)

It is known that incomes from the USA follow a normal distri…

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 the following research question: Is an athlete’s sa…

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 The variable average contributing points per game