11. Assume that when adults with smartphones are randomly selected, 57% use them in meetings or classes. If 20 adult smartphone users are randomly selected, find the probability that exactly 15 of them use their smartphones in meetings or classes.
The probability is _____
(Round to four decimal places as needed.)
12. Assume that when adults with smartphones are randomly selected, 58% use them in meetings or classes. If 10 adult smartphone users are randomly selected, find the probability that at least 7 of them use their smartphones in meetings or classes.
The probability is_____
(Round to four decimal places as needed.)
13. A survey showed that 76% of adults need correction (eyeglasses, contacts, surgery, etc.) for their eyesight. If 8 adults are randomly selected, find the probability that no more than 1 of them need correction for their eyesight. Is 1 a significantly low number of adults requiring eyesight correction?
The probability that no more than 1 of the 8 adults require eyesight correction is _____.
(Round to three decimal places as needed.)
In: Math
Is the following argument valid? If so, construct a formal proof (direct or indirect). If not, explain why not.
If Alex gets a new job, then he will buy a guitar.
If Alex wins the lottery, then he will buy a guitar.
If Alex goes to Costa Rica, then either Alex got a new job or Alex won the lottery.
Alex goes to Costa Rica.
Therefore, Alex bought a guitar.
In: Statistics and Probability
1) If free trade is best then why is there so much pressure for protectionist measures? 2) Explain who wins and who loses if a tariff is implemented on a good. 3) Explain briefly the rationale behind the infant industry argument for a tariff. What are some of the problems with it? 4) What are quota rents? What is their equivalent with tariff? 5) Which are more restrictive, quotas or tariffs? When?
In: Economics
Belongs to Hospitality Law
Is it fair that we have to go looking for problems? Do you think doing this helps us limit liability? Sometimes we are held responsible when people do some pretty dumb things. Search online for the craziest case that a hotel or restaurant was held responsible for. Post your examples and the case citations here. Funniest one wins!
In: Nursing
Your friend Ande plays a lot of Overwatch, and mainly plays as one of two types of characters: Tank characters and Support characters. Suppose he grabs a random sample of 100 games where he played as a Tank character, which he won 63 of. He also takes a random sample of 150 games where he played as a Support character, which he won 75 of.
a) What is the estimate of the difference in proportion of games Ande wins? Find the estimate of pT ank − pSupport. b) Is it appropriate to assume that the sampling distribution of the difference in proportions is normally distributed?
c) Find a 95% confidence interval for the difference in part (a) and interpret it.
d) Suppose Ande wants to test to see if he wins a higher proportion of games as a Tank character at a significance level of .05. What are the hypotheses for this test?
e) Calculate the z-test statistic for the tests defined in part (d).
f) Find the P-value for the test defined in part (d)
g) State your conclusion for the hypothesis test, and then interpret the result in the context of the problem.
In: Statistics and Probability
Hi had a question I am trying to develop this iOS app in Xcode in Swift language and getting hung up on this Rock Paper Scissors game on the bottom is my code when it comes to paper and rock rock wins when it comes to rock and scissors scissors wins other than that it works ok . please help thanks !
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var leftblankview: UIImageView!
@IBOutlet weak var rightblankview: UIImageView!
@IBOutlet weak var leftscorelabel: UILabel!
@IBOutlet weak var rightscorelabel: UILabel!
var leftScore = 0
var rightScore = 0
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
@IBAction func buttonclick(_ sender: Any) {
let leftNumber = Int.random(in: 1...3)
let rightNumber = Int.random(in: 1...3)
leftblankview.image = UIImage(named: "symbol\(leftNumber)")
rightblankview.image = UIImage(named: "symbol\(rightNumber)")
if leftNumber > rightNumber {
leftScore += 1
leftscorelabel.text = String(leftScore)
}
else if leftNumber < rightNumber{
rightScore += 1
rightscorelabel.text = String(rightScore)
}
else{
}
}
}
In: Computer Science
Suppose we need to pick two numbers from {1,2,3,4,...,100} uniformly at random (you might choose the same number twice). What is the probability that the sum of the two picked numbers is divisible by 5?
In: Statistics and Probability
2) Suppose the number of typos in the rough draft of a document is a Poisson random variable with an expected value of 1 typo per page. What is the probability that one page of the document has at least 1 typo?
In: Statistics and Probability
Suppose we have 4 students and we take their phones then return the phones to them randomly. Let X be the number of students who receive their own phone. Create a probability distribution chart for X.
In: Statistics and Probability
Show that the probability that all permutations of the sequence 1, 2, . . . , n have no number i being still in the ith position is less than 0.37 if n is large enough. Show all your work.
In: Advanced Math