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trasher [3.6K]
2 years ago
9

Here is a summary of the Boston Marathon completion times for two years.

Mathematics
2 answers:
artcher [175]2 years ago
7 0

Answer:

"It's approximately normal, because both sample sizes are at least 30."

Step-by-step explanation:

The shape of the population distribution is unknown; however as the sample size is 35 (fulfills the sample size criteria: \geq 30), we can conclude that the sampling distribution is therefore approximately normal.

kondor19780726 [428]2 years ago
5 0

Answer:

Here is a summary of the Boston Marathon completion times for two years.

Year

Mean (minutes)

Standard deviation (minutes)

Number of runners

2012

263

50

21,576

31,984

2014

243

52

A sports journalist takes separate random samples of 35 runners from each year. Then they look at the

difference in the mean completion time sampled from each year 2012 - 2014).

What do we know about the shape of the sampling distribution of D2012 22014, and why?Step-by-step explanation:

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Answer:

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Step-by-step explanation:

The first thing we can do is to find the difference between the number of points that Carla scored in her first game and her second game.

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