Question

2.) When a car is randomly selected, the number of bumper
stickers and the corresponding probabilities are: 0 (0.814); 1
(0.083); 2 (0.044); 3 (0.019); 4 (0.012); 5 (0.008); 6 (0.008); 7
(0.004); 8 (0.004); 9 (0.004);

a.) Does the given information describe a probability distribution?
Explain why

b.) Assuming that a probability distribution is described, find
its mean and standard deviation.

c.) Use the range rule of thumb to identify the range values for
unusual numbers of bumper stickers. d.) Is it unusual for a car to
havve more than one bumper sticker? Explain

3.) Assume that a procedure yields a binomial distribution with a trial repeated n=20 times. Use the binomial formula to find the probability of x=5 successes given the probability p=0.25 of success on a single trial.

4.) In the United States, 40% of the population have brown eyes. If 15 people are randomly selected, find the probability that at least 11 of them have brown eyes. Is it unusual to randomly select 15 people and find at least 11 of them have brown eyes? Why or why not?

5.) In a past presidential election, the actual voter turnout
was 59%. In a survey, 1002 subjects were asked if they voted in the
presidential election.

a.) Find the mean and standard deviation for the number of actual
voters in groups of 1002.

b.) In the survey of 1002 people, 711 said that they voted in the
last presidential election. Is this result consistent with the
actual voter turnout, or is this result unlikely to occur with an
actual voter turnout of 59% Why or why not?

c.) Based on these results, does it appear that accurate voting results can be obtained by asking voters how they acted?

Answer #1

In a survey of 1002 people, 701 said that they voted in a recent
presidential election (based on data from ICR Research Group).
Voting records show that 61% of eligible voters actually did
vote.
(a) Find a 99% confidence interval estimate of the proportion of
people who say that they voted.
(b) Are the survey results consistent with the actual voter
turnout of 61%? Why or why not?

1)Assume that when adults with smartphones are randomly
selected, 48% use them in meetings or clas2)ses. If 6 adult
smartphone users are randomly selected, find the probability that
at least 3 of them use their smartphones in meetings or classes.
The probability is
2)
Determine whether or not the procedure described below results
in a binomial distribution. If it is not binomial, identify at
least one requirement that is not satisfied.
FourFour
hundred different voters in a region with two...

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