Of a classroom filled with 20 students, 2 will be selected to stay after school and correct homework for extra credit. How
2 answers:
You might be interested in
Recall that
and so replacing
so the limit is 0.
Answer:
There is enough evidence to support the claim that the proportion of brand awareness of female TV viewers and the gender of the spokesperson are not independent (P-value = 0.01537).
Step-by-step explanation:
<em>The question is incomplete: the picture attached gives the missing sample data.</em>
This is a hypothesis test for the difference between proportions.
The claim that is going to be stated in the alternative hypothesis is that the proportion of brand awareness of female TV viewers and the gender of the spokesperson are not independent. This means that the proportions differ significantly.
Then, the null and alternative hypothesis can be written as:
The significance level is 0.05.
The sample 1 (Male celebrity), of size n1=150 has a proportion of p1=0.273.
The sample 2 (Female celebrity), of size n2=150 has a proportion of p2=0.407.
The difference between proportions is (p1-p2)=-0.133.
The pooled proportion, needed to calculate the standard error, is:
The estimated standard error of the difference between means is computed using the formula:
Then, we can calculate the z-statistic as:
This test is a two-tailed test, so the P-value for this test is calculated as (using a z-table):
As the P-value (0.01537) is smaller than the significance level (0.05), the effect is significant.
The null hypothesis is rejected.
There is enough evidence to support the claim that the proportion of brand awareness of female TV viewers and the gender of the spokesperson are not independent (the proportions differ).
