Question

4. (10pts) Suppose that 40% of U.S. voters are Democrats. What is the probability that in a sample of 200 voters that at least 90 people will be Democrat?

Answer #1

P[ voters are Democrat ] = 40% = 0.4

Sample size = n = 200

P[ At least 90 ] = P[ X > 90 ] = P[ p > 90/200 ] = P[ p > 0.45 ]

The following information has been provided about the population proportion and the sample size:

Population Proportion = | 0.4 |

Sample Size = | 200 |

We need to compute . Based on the information provided, the population men of sample proportions and the corresponding standard error are:

Now, the following is obtained using normal approximation:

4. (10pts) Suppose that 40% of U.S. voters are Democrats. What
is the probability that in a sample of 200 voters that at least 90
people will be an Democrat?

Suppose that 40% of U.S. voters are Democrats. What is the
probability that in a sample of 200 voters that at least 90 people
will be a Democrat?

5) Suppose that 40% of U.S. voters are Democrats. What is the
probability that in a sample of 200 voters that at least 90 people
will be Democrat?

In summit county 35% of registered voters are democrats. What is
the probability that in a random sample of 300 voters: A) 100 or
more are democrats? B) Between 100 and 120 are democrats? C) 90 or
fewer are democrats?

In a certain town, 39.1% of the voters are Democrats and 60.9%
of the voters are Republicans. In the last election 30.8% of the
Democrats, and 39.6% of the Republicans voted.
a) If a citizen who voted in the last election is randomly
selected, what is the probability that they are a
Republican?
b) If a citizen who is a Democrat is randomly
selected, what is the probability that they did not vote in the
last election?
*please answer both...

Suppose 60% of the registered voters in a country are Democrats.
If a sample of 793 voters is selected, what is the probability that
the sample proportion of Democrats will be greater than 64%? Round
your answer to four decimal places.

In one state, 52% of the voters are Republicans, and 48% are
Democrats. In a second state, 47% of the voters are Republicans,
and 53% are Democrats. Suppose a simple random sample of 100 voters
are surveyed from each state.
What is the probability that the survey will show a greater
percentage of Republican voters in the second state than in the
first state?

#4
Approximately 78 percent of 18 to 24 year olds currently are using
Snapchat. What is the probability that in a random sample of 8
people aged 18 to 24, at least 7 are using Snapchat?
#5 In 2014, 53 percent of millennial voters were Democrats. In
a random sample of 200 millennial voters, what is the probability
that more than 55% are democrats?

In a given county, records show that of the registered voters,
50% are Democrats, 35% are Republicans, and 15% are
Independents. In an election, 80% of the Democrats, 40% of the
Republicans, and 90% of the Independents voted in favor of a parks
and recreation bond proposal. If a registered voter chosen at
random is found to have voted in favor of the bond, what is the
probability that the voter is a Republican?

The data below represents the gender and political affiliation
of 100 randomly selected voters at a voting site. Suppose you
select a voter at random from this sample. Answer the following
questions.
Women
Men
Republicans
22
28
Democrats
23
14
Independents
5
8
1. What is the probability that you select a man? Use
cell references to find your answers.
a.Number of Men
b.Total Number of Voters
c.Probability of Selecting a Man
2. What is the probability of selecting a...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 31 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 4 hours ago

asked 5 hours ago