1: This year Cornell's class took one more than three times as many field trips as last year's class. This Year, Cornell's class
1 answer:
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Answer:
Step-by-step explanation:
Given
Required
Determine the probability of red then blue jelly? i.e. P(R and B)
From the question, we understand that the red jelly bean was not replaced. This means that the number of jelly beans reduced by 1 after the picking of the red jelly bean
So, we have:
This is then solved further as:
The probability has a denominator of Total - 1 because the number of jelly beans reduced by 1 after the picking of the red jelly bean
The equation becomes:
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.