Answered: a survey of 420 baseball fans, 335 of…

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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If a hurricane was headed your way, would you evacuate? The headline of a press release states, "Thirty-two Percent of People on High-Risk Coast Will Refuse Evacuation Order, Survey of Hurricane Preparedness Finds." This headline was based on a survey of 4,625 adults who live within 20 miles of the coast in high hurricane risk counties of eight southern states. In selecting the sample, care was taken to ensure that the sample would be representative of the population of coastal residents in these states. In USE SALT (a) Use this information to estimate the proportion of coastal residents who would evacuate using a 98% confidence interval. (Round your answers to three decimal places.) (b) Write a few sentences interpreting the interval and the confidence level associated with the interval. We are % confident that the proportion of all coastal residents who -Select-- v evacuate is within the confidence interval. If we were to take a large number of random samples of size 4,625, % of the…
In 2014, about 11.3% of U.S. workers belonged to a union. Suppose a sample 400 of U.S. workers is collected to determine whether union efforts to organize have increased union membership. Which if the following is the best description of what u- represents? O A. -is the average sample proportion for all possible samples of size 400 O B. H- is the average number of U.S. workers that belong to a union in all possible samples of size 400 C. O C.H- is the number of all U.S. workers that belong to a union. O D. H- is the proportion of U.S. workers in the sample that belong to a union O E. µ – is the proportion of all U.S. workers that belong to a union
In a large clinical trial, 401,602 children were randomly assigned to two groups. The treatment group consisted of 201,876 children given a vaccine for a certain disease, and 27 of those children developed the disease. The other 199,726 children were given a placebo, and 108 of those children developed the disease. Consider the vaccine treatment group to be the first sample. Identify the values of n₁. P₁. 9₁. 0₂. P2. 42. P. and q. A
We wish to gather some information relating to the average time a hospitalized Eagle Flu patient remains in the hospital. We randomly sample 16 cured formerly hospitalized Eagle Flu patients and these were the number of days spent in the hospital: 6.09, 8.04, 6.43, 8.58, 10.34, 5.40, 9.87, 9.24, 9.18, 5.06, 5.39, 5.89, 11.91, 8.94, 5.68, 9.85Many surveys of flu hospital stays show that hospitalization length is normally distributed. So, we assume that our sample comes from a normal population with unknown mean of μ days and an unknown standard deviation of σ days. We would like to test whether the average hospital stay length is less than 8.1 days..The null hypothesis is thus H0:μ=8.1 . We will test this against the alternative Ha We want to test at the 8% level.Let x = the sample mean and s = the sample standard deviation.f) Calculate the critical value, tstar, for your test.(negative value)
Consider the following random sample of data: 13, 24, 29, 16, 22, 5, 10, 1, 105, 18 a) What is the median of the sample data? Round your response to 2 decimal places. Number b) If the outlier is removed, what is the median of the remaining sample data? Number
It’s assumed that students need to stay awake more to study during finals week. One way to measure this is how much coffee is consumed during Finals week at night. A local coffee house near APU counted the number of cups of coffee sold per hour during Finals week after 6 p.m. We randomly select ten (10) hours of sales records during Finals week and find out that the following number of cups of coffee were consumed: 18, 17, 22, 14, 17, 20, 22, 24, 15, 15 By comparison, the sales records from a previous week were used as a comparison. The following number of cups of coffee were consumed over a seven (7) hour period: 9, 13, 5, 15, 17, 10, 11 a. Determine what is the appropriate statistical procedure, with a brief explanation (one sentence) as to why this is the appropriate procedure. b. State the null hypothesis. c. Execute the proper calculations with the appropriate procedures. d. Present a graph when appropriate of your results. e. Include any appropriate post-hoc tests. f. State…
When is it appropriate to use a pooled sample test?
The National Football League (NFL) is conducting a survey of fan behavior by collecting a random sample of 240 NFL fans. One question asks fans if they have ever participated in a violent act in or around their favorite team's stadium. Nationally, 28% of NFL fans have participated in a violent act around their team’s stadium. The research finds that 14% of Green Bay Packers fans have committed a violent act on game day. Conduct a significance test to answer the research question: Is there a significant difference (a=.05) in the proportion of Green Bay Packers fans compared to the rest of the NFL fans that have participated in a violent act? Which of the following test requirements does NOT belong in Step One for this test? Random sample Interval ratio variable of violent acts Normal Sampling distribution What is the critical score? What is the obtained score?
The Monterey Bay Aquarium, founded in 1984, is situated on the beautiful coast of Monterey Bay in the historic Cannery Row district. In 1985, the aquarium began a survery program that involved randomly sampling visitors as they exit for the day. The survey includes visitor demographic information, use of social media, and opinions on their aquarium visit. In 2015, the survey included 356356 visitors over age 6565 , of which 5252 used a mobile device such as an Android phone or iPad during their visit. (a) What is the margin of error ?m , of the large‑sample 95%95% confidence interval for the proportion of visitors over 6565 who used a mobile device during their visit? (Enter your answer rounded to four decimal places.)
A teller at a drive-up window at a bank had the following service times (in minutes) for 20 randomly selected customers: SAMPLE 1234 4.54.64.54.7 4.24.54.64.6 4.24.44.44.8 4.34.74.44.5 4.34.34.64.9 If the process parameters are unknown, estimate its mean and standard deviation. (That is, find the average and standard deviation of all data points at once.) Select one: O a. O b. c. O d. e. f. x_bar = 4.7, s = 0.0368 g. x_bar = 4.3, s = 0.19 x_bar = 4.7, s = 0.19 x_bar = 4.3, s= 0.0368 x_bar = 4.5, s = 0.0368 x_bar = 4.5, s = 0.19 None of the other options.
Pick the Test (Z-test, Single Sample T-test, Independent Sample T-test, Paired Sample Ttest, ANOVA): 18. A psychologist is interested in attitudes towards the disabled. She believes that contact with someone who is disabled might have an effect on peoples' attitudes. To test her hypothesis, she measured attitudes toward the disables both before and after contact with an individual in a wheelchair. What type of statistical test should she use to determine if contact with a disabled person changes peoples' attitudes toward the disabled? Test: ______________________
A random sample of employees participating in a company fitness program were asked how many days they logged an exercise activity in the past month. Their responses are reported in the histogram below.Based on the histogram above, what is the class width? Clas width = ? Days What is the sample size? Sample size = ? employees

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a survey of 420 baseball fans, 335 of them favor testing ball players for preformance enhancing drugs. Determine the sample proportion, p, that favor these test