13. Foofy studies if hearing an argument in favor of an issue alters participants' at-titudes toward the issue one way or the other. She presents a 30-second argumentto 8 people. In a national survey about this issue, µ = 50. She obtains X = 53.25and s = 569.86. (a) What are H, and H,? (b) What is tobi? (c) With a = .05, whatis fer? (d) If appropriate, compute the confidence interval for µ. (e) What conclu-sions should Foofy draw about the relationship?

Answered: Image /qna-images/answer/608c3f71-b40d-422e-b77c-93e73b768787.jpg

Answered: 13. Foofy studies if hearing an…

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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The manager of a resort hotel stated that the mean guest bill for a weekend is $600 or less. A member of the hotel's accounting staff noticed that the total charges for guest bills have been increasing in recent months. The accountant will use a sample of future weekend guest bills to test the manager's claim. (a) Which form of the hypotheses should be used to test the manager's claim? Explain. Ho: u 2 600 HaiH 600 Но: и 3D 600 Ha: u + 600 The hypotheses Ho: µ 2 600 and H: µ 600 should be used because the accountant wants to test the manager's claim that the mean guest bill u is less than or equal to 600 and find evidence to support u > 600. The hypotheses Ho: u = 600 and H: µ + 600 should be used because the accountant wants to test the manager's claim that the mean guest bill u is equal to 600 and find evidence to support u + 600. (b) What conclusion is appropriate when H. cannot be rejected? We are not able to conclude that the manager's claim is wrong. We cannot conclude that u >…
In a recent study, 20 males used a new weight-loss supplement, and 14 of them experienced weight loss after two weeks. In the same study, 50 females used the same supplement, and 29 of them experienced weight loss after two weeks. Fill in the blanks below to make the most reasonable statement possible. The new weight-loss supplement was less effective on ▼(Choose one) in the study. That is because % of them failed to lose weight after two weeks, whereas only % of the ▼(Choose one) failed to lose weight after two weeks.
The proportion of defective items is not allowed to be over 12%. A buyer wants to test whether the proportion of defectives in his shipment of 1000 items exceeds the allowable limit. The buyer takes a SRS of 100 items and finds that 19 are defective. State the null and alternative hypotheses for this test. Group of answer choices Ho: p = 0.12 vs Ha: p > 0.12 Ho: p = 0.19 vs Ha: p ≠ 0.12 Ho: p = 0.12 vs Ha: p < 0.19 Ho: p = 0.12 vs Ha: p = 0.19
Q1. A psychologist conducted a study on the relationship between introversion and shyness. The values are results for scales of introversion and shyness. High positive scores on each scale indicate high introversion or shyness; and high negative scores indicate low introversion or shyness. Data collected from 10 people as follows: Introversion 4 -7 -1 0 6 7 -4 -9 -5 8 Shyness 11 -7 -1 -3 0 7 -1 -8 -1 5 a) Compute the correlation coefficient relating introversion and shyness scores. b) Find the regression equation which predicts introversion from shyness. c) What introversion score would you predict from a shyness score of 7?
If we use a cutoff of 0.05, is it unusual for someone to have a great deal of confidence in educational institutions?
7
3. A coffee chain owner is concerned with the proportion of people who would rather order a coffee from another store. The corporate office tells her that from a separate large-scale study, they found the true proportion to be p = 0.6. As she wants to estimate this proportion herself, she asks 20 people in line whether they would switch and records a ‘1’ if they said “Yes” and records a ‘0’ otherwise. (a) Based on this study, what is the approximate distribution of the sample proportion pˆ? State all parameters and assumptions required for your answer. (b) The store owner wants to determine the cutoff point for the sample proportion for which the probability of observing a larger sample proportion is 0.50. That is, find the value ‘a’ such that P(ˆp > a) = 0.50. Show all your work. Explain how you could have found your answer immediately without using the Normal probability table and using a property about the Normal distribution.
28)
A researcher developing scanners to search for hidden weapons at airports has concluded that a new scanner is significantly better than the current scanner. He made his decision based on a test using a = 0.05. Would he have made the same decision at a = 0.20? How about α = 0.01? Explain. Select the statement relating decision making to values of a. O A. His decision would have been the same for a = 0.01 but may have been different for a = 0.20. O B. His decision would have been the same for α = 0.20 but may have been different for α = 0.01. O C. His decision may have been different for both α = 0.01 and α = 0.20. O D. His decision would have been the same for both α = 0.01 and α=0.20.

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