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olganol [36]
3 years ago
6

PLEASE HELP 13 MIN LEFT HELLPPPPP!!!!!!! I’ll mark brainliest

Mathematics
1 answer:
vekshin13 years ago
4 0

Answer:

D.

Step-by-step explanation:

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3 • 1/5 = x please help I am having a brain fart and I am running out of time!
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3/5

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A veterinarian collects data on the number of times race horses are raced during their careers. The veterinarian finds that the
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Answer:

c. (12.12, 18.48)

Step-by-step explanation:

Hello!

The study variable is X: number of times a racehorse is raced during its career.

The average number is X[bar]= 15.3 and the standard deviation is S= 6.8 obtained from a sample of n=20 horses.

To estimate the population mean you need that the variable has a normal distribution, in this case, we have no information about its distribution so I'll assume that it has a normal distribution. With n=20 the most accurate statistic to use for the estimation is a Students-t for one sample, the formula for the interval is:

X[bar] ± t_{n-1;1-\alpha /2} * \frac{S}{\sqrt{20} }

t_{n-1;1-\alpha /2} = t_{19;0.975}= 2.093

[15.3 ± 2.093 * \frac{6.8}{\sqrt{20} }]

[12.12; 18.48]

Using a significance level of 95% you'd expect that the true average of times racehorses are raced during their career is included in the interval [12.12; 18.48].

I hope it helps!

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