A box of nine iPhone 7 cellphones contains two red cellphones and seven black cellphones. a. If two cellphones are randomly selected from the box, without replacement (the first cellphones is not returned to the box alter it is selected), what is the probability that both the cellphones selected will be red? b. If two cellphones are randomly selected from the box, without replacement (the first cellphones is not returned to the box after it is selected), what is the probability that here will he one red cellphone and one black cellphone selected? c. If three cellphones are selected. With replacement (the cellphones are returned to me box after they are selected). What is the probability that all three will be red? d. If you were sampling with replacement (the first cellphones is returned to the box alter it is selected) what would be the answers to (a) and (b)?
A box of nine iPhone 7 cellphones contains two red cellphones and seven black cellphones. a. If two cellphones are randomly selected from the box, without replacement (the first cellphones is not returned to the box alter it is selected), what is the probability that both the cellphones selected will be red? b. If two cellphones are randomly selected from the box, without replacement (the first cellphones is not returned to the box after it is selected), what is the probability that here will he one red cellphone and one black cellphone selected? c. If three cellphones are selected. With replacement (the cellphones are returned to me box after they are selected). What is the probability that all three will be red? d. If you were sampling with replacement (the first cellphones is returned to the box alter it is selected) what would be the answers to (a) and (b)?
Solution Summary: The author determines the probability that two cellphones are randomly selected from the box without replacement. The required probability is 0.0278.
A box of nine iPhone 7 cellphones contains two red cellphones and seven black cellphones.
a. If two cellphones are randomly selected from the box, without replacement (the first cellphones is not returned to the box alter it is selected), what is the probability that both the cellphones selected will be red?
b. If two cellphones are randomly selected from the box, without replacement (the first cellphones is not returned to the box after it is selected), what is the probability that here will he one red cellphone and one black cellphone selected?
c. If three cellphones are selected. With replacement (the cellphones are returned to me box after they are selected). What is the probability that all three will be red?
d. If you were sampling with replacement (the first cellphones is returned to the box alter it is selected) what would be the answers to (a) and (b)?
During busy political seasons, many opinion polls are conducted. In apresidential race, how do you think the participants in polls are generally selected?Discuss any issues regarding simple random, stratified, systematic, cluster, andconvenience sampling in these polls. What about other types of polls, besides political?
Please could you explain why 0.5 was added to each upper limpit of the intervals.Thanks
28. (a) Under what conditions do we say that two random variables X and Y are
independent?
(b) Demonstrate that if X and Y are independent, then it follows that E(XY) =
E(X)E(Y);
(e) Show by a counter example that the converse of (ii) is not necessarily true.
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, statistics and related others by exploring similar questions and additional content below.
Discrete Distributions: Binomial, Poisson and Hypergeometric | Statistics for Data Science; Author: Dr. Bharatendra Rai;https://www.youtube.com/watch?v=lHhyy4JMigg;License: Standard Youtube License