You believe that students at your school would prefer healthier options in the cafeteria. To testthis theory, you conduct a significance test by randomly selecting 200 students and askingthem, "If healthier options were available in the cafeteria, would you choose to eat healthierS= J00options?" Which test shouldyou useinyour study?AI sample z test1 sample t test1 proportion z testcannot be determined

Answered: Image /qna-images/answer/3f60f060-f4fb-4107-9a4c-deea0724dc01.jpg

Answered: You believe that students at your…

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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You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 2.5 percentage points of the true population percentage. Complete parts (a) and (b) below.
You are the operations manager for an airline and you are considering a higher fare level for passengers in aisle seats. How many randomly selected air passengers must you survey? Assume that you want to be 90% confident that the sample percentage is within 3.5 percentage points of the true population percentage. Complete parts (a) and (b) below.
A researcher asks a sample of brothers and sisters to rate how positive their family environment was during their childhood. In this study, the differences in ratings between each brother and sister pair were compared. Type type of design described here would be _____ A. Repeated-measures design B. Matched-samples design C. Both
A marketing agency wanted to determine if a new commercial changed people's opinion about a company. They recruited n=30 participants to watch the commercial. First, everyone was givien a survey to determine their attitudes toward the company. Then, everyone watched the new commercial. Finally, they were given the same survey again and asked about their attitudes toward the comapny after seeing the commercial. The agency wanted to see if attitudes were changed by the commercial. What statistical test should they use?
You want to compare the average working time of customer service from two companies. 9 representatives were randomly selected from a insurance company and 20 representatives were randomly selected from an airline company and their working time (in hours) in the past week were recorded. what test would you use? Two-proportions z-test Two-sample t-test One-sample t-test Paired t-test
Answer and explain your answer corectly. i ll rate accordingly.
You are told that the proportion p-hat of those who answered "yes" to a poll about internet use is p-hat = 0.70, and the standard error of the proportion is 0.0458. What was the sample size?
The Bureau of Labor Statistics reports that the official unemployment rate for Black people was 10.4% and 4.7% for White people in February 2015. Select all correct answers for this question. O The samples of white and black people are independent. The explanatory variable is the unemployment rate. The response variable is the unemployment rate. The response variable is race.
Hi I need help with this excerise please Noodles and Company tested consumer reaction to two spaghetti sauces. Each of 70 judges rated both sauces on a scale of 1 (worst) to 10 (best) using several taste criteria. To correct for possible bias in tasting order, half the judges tasted Sauce A first, while the other half tasted Sauce B first. Actual results are shown below for “overall liking.” Sauce A:8, 6, 8, 5, 6, 3, 7, 9, 6, 7, 8, 2, 7, 6, 7, 5, 9, 7, 7, 8, 6, 2, 6, 5, 8,7, 7, 6, 3, 8, 5, 5, 8, 8, 6, 8, 8, 8, 7, 6, 7, 8, 5, 5, 5, 5, 1, 6, 6, 8,9, 6, 6, 5, 5, 8, 6, 5, 4, 5, 5, 9, 6, 7, 1, 7, 6, 8, 7, 8 Sauce B:7, 6, 8, 2, 9, 6, 7, 1, 8, 6, 1, 5, 6, 5, 7, 2, 8, 6, 7, 5, 8, 6, 2, 8, 8,7, 3, 5, 6, 5, 6, 7, 8, 3, 7, 8, 6, 6, 1, 6, 7, 6, 8, 6, 3, 7, 8, 6, 7, 7,8, 6, 2, 6, 8, 5, 5, 7, 5, 8, 3, 6, 5, 6, 6, 6, 7, 8, 7, 1 (a) Calculate the mean and standard deviation for each sample. (Round your answers to 3 decimal places.) x⎯⎯x¯ S Sauce A Sauce B (b)…
What happens to measures of effect size such as r2 and Cohen's d as sample size increases? a. Doesn't influence the effect size. b. They tend to increase. c. They tend to decrease.
In Problems 9-12, conduct each test at the a= 0.05 level of significance by determining (a) the null and alternative hypotheses, (b) the test statistic, (c) the critical value, and (d) the P-value. Assume that the samples were obtained independently using simple random sampling.
1. A scientist is studying the effect of exercise on blood pressure. He studies 50 people who exercise regularly to find out whether their blood pressures are low, average, or high. This is an example of a(n): Answer choices: sample survey. observational study. experiment.

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