Sienna has a car loan with an annual interest rate of 4.8%. She will make the same monthly payment for 48 months, after which th
1 answer:
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Answer: Hi! the answer is D, now let's prove it:
Ok, let's analyze our problem; we know two facts:
1) the first day, the video has 143 likes
2) each day that pases, there are 3 times more likes.
this means, that the day 1, the video has 143 like, the day 2, has 3*143 = 429 likes, the day 3, it has 3*429 = 1287
now, this is f(n) = the number 143 multiplied by 3 (n - 1) times, where n is the amount of days.
the function that describes this is f(n) =
when n = 1, f(1) = = 143
when n = 2, f(2) = = 143*3
and so on, so the correct answer is D.
Also you can check the other functions if you like:
A) c(1) = (3)(143)^{1-1} = 3, so A doesn't work for the first day.
B) c(1) = 143^{1-1} = 1, B neither works for the first day.
C) c(1) = (3)143 − 1 = 428. C neither works for the first day
Answer:
The p-value here is 0.0061, which is very small and we have evidence that the girls' mean is higher than the boys' mean.
Step-by-step explanation:
We suppose that the two samples are independent and normally distributed with equal variances. Let be the mean number of ring tones for girls, and
the mean number of ring tones for boys.
We want to test vs
(upper-tail alternative).
The test statistic is
T =
where
.
For this case, ,
,
,
,
.
and the observed value is
t = .
We can compute the p-value as P(T > 2.6309) where T has a t distribution with 20 + 20 - 2 = 38 degrees of freedom, so, the p-value is 0.0061. Because the p-value is very small, we can reject the null hypothesis for instance, at the significance level of 0.05.