Question

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 major political​ parties, A and​ B, are randomly selected from the population of

35003500

registered voters. Each is asked if he or she is a member of political party​ A, recording Yes or No.

Choose the correct answer below.

A.

​No, there are more than two possible outcomes.

B.

No comma the trials are not independent and the sample is more than 5 % of the population.No, the trials are not independent and the sample is more than 5% of the population.

C.

Yes comma the result is a binomial probability distribution.Yes, the result is a binomial probability distribution.

D.

​No, the number of trials is not fixed.

E.

​No, the probability of success is not the same in all trials.

3)

a. Find the probability of getting exactly 4 sleepwalkers among 5 adults.

0.0280.028

​(Type an integer or a decimal. Do not​ round.)

b. Find the probability of getting 4 or more sleepwalkers among 5 adults.

0.0350.035

​(Type an integer or a decimal. Do not​ round.)

c. Which probability is relevant for determining whether 4 is a significantly high number of sleepwalkers among 5​ adults: the result from part​ (a) or part​ (b)?

A.

Since the probability of getting 4 sleepwalkers is the result from part​ (a), this is the relevant probability.

B.

Since the probability of getting 5 sleepwalkers is less likely than getting 4​ sleepwalkers, the result from part​ (a) is the relevant probability.

C.

Since the probability of getting 5 sleepwalkers includes getting 4​ sleepwalkers, the result from part​ (b) is the relevant probability.

D.

Since the probability of getting fewer than 4 sleepwalkers is the complement of the result from part​ (b), this is the relevant probability.

d. Is 4 a significantly high number of 4 sleepwalkers among 5​ adults? Why or why​ not? Use 0.05 as the threshold for a significant event.

A.

​No, since the appropriate probability is greater than​ 0.05, it is not a significantly high number.

B.

​Yes, since the appropriate probability is less than​ 0.05, it is a significantly high number.

C.

​No, since the appropriate probability is less than​ 0.05, it is not a significantly high number.

D.

​Yes, since the appropriate probability is greater than​ 0.05, it is a significantly high number.

Answer 1