4.69 Superstitions survey. Are Americans superstitious? AHarris (Feb. 2013) poll of over 2,000 adult Americans wasdesigned to answer this question. One survey item con-cerned the phrase "see a penny, pick it up, all day longyou'll have good luck." The poll found that just one-thirdof Americans (33%) believe finding and picking up apenny is good luck. Consider a random sample of 20 Ú.S.adults and let x represent the number who believe findingand picking up a penny is good luck.a. For this experiment, define the event that represents a"success."b. Explain why x is (approximately) a binomial randomvariable.c. Give the value of p for this binomial experiment.

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Answered: 4.69 Superstitions survey. Are…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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1. The percentage of 12- to 17-year-olds who reported talking at least once in the past year with their parents about the dangers of drug, tobacco, or alcohol is 60% nationally. A state youth council believes this proportion is higher in their state, where there has been an intense media campaign about this issue. A survey of randomly chosen students from across the state shows 1032 of 1642 students reporting they are having these conversations with their parents. Is there evidence that the percent of students using drugs, tobacco or alcohol in this state is above the national rate?
The University of Chicago's General Social Survey (GSS) is the nation's most important social science sample survey. For reasons known only to social scientists, the GSS regularly asks a random sample of people their astrological sign. Here are the counts of responses from a recent GSS of 4344 people: Sign Aries Taurus Count 321 360 Sign Libra Scorpio Count 392 329 Gemini 367 Sagittarius 331 Cancer 374 Capricorn 354 Leo 383 Aquarius 376 Virgo 402 Pisces 355 We want to test Ho: All 12 astrological signs are equally likely versus Ha: All 12 astrological signs are not equally likely. Use a chi-square goodness-of-fit test to compute a test statistic and P-value. Do these data provide convincing evidence at the 1% significance level that all 12 signs are not equally likely? Because the P-value of 0.6562 > 0.05, we cannot reject the null hypothesis. We cannot conclude that all 12 signs are not equally likely. Because the P-value of 0.0487 > 0.01, we cannot reject the null hypothesis. We…
Below example 1 in section 3.4 in the textbook, there is a bold text on "A disadvantage of the mean ".If we have a sample of salaries of $20,000, 30,000, $40,000, $50,000, and $3,000,000, which is the best measure for central tendency? a) Meanb) Medianc) ModeType the correct word in the answer blank.
A group of students at a local university were asked about their status (undergraduate, graduate, or non-degree seeking) and how they get to campus (walk/bike or car/bus/etc.). The results are summarized in the table below. How do you get to Campus? Walk/Bike Car/Bus/etc. Total Undergraduate 80 20 100 Graduate 40 10 50 Non-degree Seeking 10 40 50 Total 130 70 200 Suppose we choose a person at random from this sample. Which of the following statements is true? (A) If the person uses a car/bus/etc. to get to campus, then he or she is more likely to be a non- degree seeking student than a degree seeking student (undergraduate or graduate). (B) If the person is an undergraduate, then he or she is more likely to use a car/bus/etc. to get to campus than to walk/bike to campus. (C) The person is more likely be a graduate student if he or she uses a car/bus/etc. to get to campus than if he or she walks/bikes to campus. (D) The person is more likely to use a car/bus/etc. to get to campus than…
16. The Higher Education Research Institute at UCLA collected data from 203,967 incoming first-time, full-time freshmen from 270 four-year colleges and universities in the U.S. 71.6% of those students replied that, yes, they believe that same-sex couples should have the right to legal marital status. Suppose that you randomly pick twelve first-time, full-time freshmen from the survey. You are interested in the number that believes that same-sex couples should have the right to legal marital status.What is the standard deviation (?)? (Round your answer to four decimal places.)? = ___________
a. A marine biologist measures the effectiveness of mating displays among tortoises in one of six environmental conditions. Ten tortoises are randomly assigned to each condition. (for this item, also give the degrees of freedom) b. A neuropsychologist measures the behavioral response to electrical stimulation in one of five brain regions. c. A sociologist records the number of children born in a local village each season (spring, summer, fall, winter) in a single year. d. A social psychologist has participants rate the likability of a person described as having one of three types of leadership styles. The breakdown of leadership styles is 25 autocratic, 25 bureaucratic, and 25 democratic. (for this item, also give the degrees of freedom) For items (a) – (d) identify the following: k? N? n? (assumed equal size groups)? What is the decision at 0.05 level of significance for each of the following tests? Are post hocs necessary? a. F(3, 28) = 3.00 b. F(1, 40) = 4.98 c. F(4, 30) = 2.72 d.…
1. A paper on men's and women's eating behaviors describes an experiment in which 74 men were assigned at random to one of four treatments. viewed slides of fit, muscular men viewed slides of fit, muscular men accompanied by diet and fitness-related text viewed slides of fit, muscular men accompanied by text not related to diet and fitness did not view any slides The participants then went to a room to complete a questionnaire. In this room, bowls of pretzels were set out on the tables. A research assistant noted how many pretzels were consumed by each participant while completing the questionnaire. Data consistent with summary quantities given in the paper are given in the table. Treatment 1 Treatment 2 Treatment 3 Treatment 4 8 7 1 7 7 8 5 2 4 0 2 5 13 4 0 7 2 9 3 5 1 8 0 2 5 6 3 0 8 2 4 0 12 7 4 3 5 8 5 4 1 8 5 2 0 5 8 4 6 14 8 1 4 9 4 1 12 0 0 7 6 6 0 3 3 12 12 5 6 10 8 6 2 10…
Sierra College students enrolled in an online Elementary Statistics course were asked to participate in an anonymous onlne survey. The survey asked the students "Which type of device will you primarily use to access your online course in Canvas?". Of the 152 students who answered this question, 20 responded "a desktop computer", 121 responded "a laptop computer", 6 responded "a smartphone", and 5 responded "a tablet". The Sierra College Mathematics Department believes that less than 5% of students enrolled in an online Elementary Statistics course primarily uses a smartphone to access their online course in Canvas. Use the data collected in the survey to conduct a hypothesis testing procedure to test this belief. What conclusion should be reached according to the results of this hypothesis test?
Refer to the following scenario. A government official is in charge of allocating social programs throughout the city of Vancouver. He will decide where these social outreach programs should be located based on the percentage of residents living below the poverty line in each region of the city. He takes a simple random sample of 120 people living in Gastown and finds that 21 have an annual income that is below the poverty line. For each of the following statements, specify whether the statement is a correct interpretation of the 95% confidence interval for the true proportion of Gastown residents living below the poverty line. A. 17.50% (21/120) of Gastown residents are living below the poverty line. ? B. There is a 95% probability that the true proportion of Gastown residents who are living below the poverty line equals 21/120. C. If another random sample of 120 Gastown residents is drawn, there is a 95% probability that the sample proportion of Gastown residents who are living below…
Refer to the following scenario. A government official is in charge of allocating social programs throughout the city of Vancouver. He will decide where these social outreach programs should be located based on the percentage of residents living below the poverty line in each region of the city. He takes a simple random sample of 123 people living in Gastown and finds that 24 have an annual income that is below the poverty line. For each of the following statements, specify whether the statement is a correct interpretation of the 95% confidence interval for the true proportion of Gastown residents living below the poverty line. A. 19.51% (24/123) of Gastown residents are living below the poverty line. ? + B. There is a 95% probability that the true proportion of Gastown residents who are living below the poverty line equals 24/123. ? + C. If another random sample of 123 Gastown residents is drawn, there is a 95% probability that the sample proportion of Gastown residents who are living…
Given a data set, how do you know whether to calculate o or s? Choose the correct answer below. A. If the given data set contains a large number of entries, then s is calculated. If the data set contains a small number of entries, then σ is calculated. B. When given a data set, one would have to determine if it represented the population or if it was a sample taken from the population. If the data are a population, then o is calculated. If the data are a sample, then s is calculated. C. If the given data set contains a large number of entries, then o is calculated. If the data set contains a small number of entries, then s is calculated. D. When given a data set, one would have to determine if it represented the population or if it was a sample taken from the population. If the data are a population, then s is calculated. If the data are a sample, then o is calculated.

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