John Daum and Chris Yin are star swimmers at a local college. They are preparing to compete at the NCAA Division II national cha
mpionship meet, where they both have a good shot at earning a medal in the men’s 100-meter freestyle event. The coach feels that Chris is not as consistent as John, even though they clock about the same average time. In order to determine if the coach’s concern is valid, you clock their time in the last 9 runs and compute a standard deviation of 0.93 seconds for John and 1.08 seconds for Chris. It is fair to assume that clock time is normally distributed for both John and Chris. Let the clock time by John and Chris represent population 1 and population 2, respectively.
Calculate the value of the test statistic.
Calculate the value of the test statistic.
1 answer:
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Answer:
The population will become 840 million in 2019.
Step-by-step explanation:
Given:
The exponential model of population is given as:
Here, 't' is in years measured since 2003.
This means for the year 2003, t = 0 and so on.
Now, in order to get the year when the population is 840 million, we need to plug in 840 for 'A' and solve for 't'. Therefore,
Taking natural log on both sides, we get:
Therefore, 16 years after 2003, the population will be 840 million.
So, the year is equal to 2003 + 16 = 2019.
Hence, in the year 2019, the population will become 840 million.