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Lady bird [3.3K]
3 years ago
15

Zach read a book for 10 minutes every weekend in the first month, 20 minutes in the second month, 40 minutes in the third month,

and 80 minutes in the fourth month.
Victoria read a book for 35 minutes every weekend in the first month, 50 minutes in the second month, 65 minutes in the third month, and 80 minutes in the fourth month.

Which statement best describes the methods used by Zach and Victoria to increase the time they spent reading a book? (1 point)


Zach's method is linear because the number of minutes increased by an equal factor every month.

Victoria's method is linear because the number of minutes increased by an equal number every month.

Both Victoria's and Zach's methods are exponential because the number of minutes increased by an equal factor every month.

Both Victoria's and Zach's methods are exponential because the number of minutes increased by an equal number every month.
Mathematics
2 answers:
coldgirl [10]3 years ago
8 0
Victoria is linear because each month increases her minutes by a constant 15 minutes.

Zach's is exponential because each month he doubles is minutes.
Firdavs [7]3 years ago
3 0
Both Victoria's and Zach's methods are exponential because the number of minutes increased by an unequal factor each month
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c. (12.12, 18.48)

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Hello!

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

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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} }

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[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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