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A sprinter can run 279 feet in 9 seconds. find the sprinter's unit rate of feet per second.
2 answers:
Answer: The required sprinter's unit rate is 31 feet per second.
Step-by-step explanation: Given that a sprinter can run 279 feet in 9 seconds.
We are to find the sprinter's unit rate of feet per second.
We will be using the UNITARY method to solve the given problem.
According to the given information, we have
In 9 second, distance run by the sprinter = 279 feet.
Therefore, in 1 second, the distance run by sprinter will be
Thus, the required sprinter's unit rate is 31 feet per second.
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Answer:
The decision rule is
Fail to reject the null hypothesis
The conclusion is
There is no sufficient evidence to show that the designer's claim of a better shoe is supported by the trial results.
Step-by-step explanation:
From the question we are told that
The population mean is
The sample size is n = 25
The sample mean is
The standard deviation is
Let assume the level of significance of this test is
The null hypothesis is
The alternative hypothesis is
Generally the degree of freedom is mathematically represented as
=>
=>
Generally the test statistics is mathematically represented as
=>
=>
Generally from the student t distribution table the probability of obtaining to the right of the curve at a degree of freedom of
is
From the value obtained we see that hence
The decision rule is
Fail to reject the null hypothesis
The conclusion is
There is no sufficient evidence to show that the designer's claim of a better shoe is supported by the trial results.