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blackops7959
22.04.2020 •
Business
Before the last presidential debates, 50% of registered votes indicated they were planning to vote for the incumbent president. In a recent poll of 1200 registered voters after the debates, 636 indicated they are planning to vote for the incumbent president. Has there been a significant increase in the proportion of registered voters who are planning to vote for the incumbent president?
a. State the null and alternative hypotheses to be tested.
b. Compute the test statistic.
c. The null hypothesis is to be tested using α = .05. Compute the p-value.
d. What do you conclude?
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Ответ:
a) H₀ : p = 0.5
b) z = 2.0785
c) p - value = 0.0188
d) Our conclusion is that there has been a significant increase in the proportion of registered voters who are planning to vote for the incumbent president
Explanation:
Probability of those planning to vote for the incumbent president before the debate, P₀ = 50/100 = 0.5
a) The null and the alternative hypothesis
Let the null hypothesis be represented by![H_{0}](/tpl/images/0619/5090/f090d.png)
and the alternative hypothesis be represented by![H_{a}](/tpl/images/0619/5090/0b1a6.png)
H₀ : p = 0.5
b) compute the test statistics
sample size, n = 1200
number of voters planning to vote for the incumbent president, x = 636
Probability of those planning to vote for the incumbent president in the selected sample:
Formula for the test statistic:
z = 2.0785
c)
For
, the critical value as checked from the normal table will be:
The P value for z > 2.0785
d) What do you conclude?
since
, we will reject the null hypothesis.
Our conclusion is that there has been a significant increase in the proportion of registered voters who are planning to vote for the incumbent president
Ответ:
4. Get feedbac.
What is difference between job and role? Here's an example Turri gave:According to Turri, the difference is that while a person's job describes what they do on a daily basis, their role encompasses how their actions add value to the organization. ... That process can be applied to any job at any organization.Explanation:
i got this straght from go ogle so be shoure to annotate or reword