Question

*SHOW WORK

Of 300 female registered voters surveyed, 120 indicated they were planning to vote for the incumbent president; while of 400 male registered voters, 140 indicated they were planning to vote for the incumbent president.

a. | Compute the test statistic. |

b. | At α = .01, test to see if there is a significant
difference between the population proportions of females and males
who plan to vote for the incumbent president. (Use the
p-value approach.) |

Answer #1

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A simple random sample of 1500 registered voters was surveyed
and asked whether or not they were planning to vote for the
incumbent president for re-election, and no other choices were
possible. 739 of them replied that they were planning on not voting
for the incumbent president for re-election. The president claims
that more than half of all voters will vote for him.
A. Verify that the P-Value for the proportion of voters that
will vote for the incumbent president...

HI6007 Statistics for Business Decisions
Tutorial 7 – Week 8
Question 1:
The average starting salary of students who graduated from
colleges of Business in 2009 was $48,400. A sample of 100 graduates
of 2010 showed an average starting salary of $50,000. Assume the
standard deviation of the population is known to be $8000. We want
to determine whether or not there has been a significant increase
in the starting salaries.
Step 1. Statement of the
hypothesis
Step 2....

rep
dem
ind
male
200
150
50
female
250
300
50
1. An exit poll surveyed a random sample of 1000 voters. Voters
were classified by gender and by voting preferences: republican,
democrat, or independent. The results are shown in the table
above.
(a) Does the data indicate that there is a gender gap in voting
preferences? That is, are voting preferences and gender
independent? Test the hypothesis at the 10% significance level.
(b) After doing this problem, in your...

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