Northside High wants to estimate the number of seniors who plan to go to a 4-year college. Answer the following.(a) Which of the following surveys probably would best represent the entire population ofseniors?25 honor roll students are randomly selected from the senior class; 18 plan to go to a4-year college.O 25 seniors are randomly selected; 13 plan to go to a 4-year college.O 25 Glee Club members are randomly selected; 16 plan to go to a 4-year college.(b) There are 550 seniors at Northside High. Using your answer from part (a), estimate thenumber of seniors who plan to go to a 4-year college.seniors

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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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he city of Raleigh has 7000 registered voters. There are two candidates for city council in an upcoming election: Brown and Feliz. The day before the election, a telephone poll of 400 randomly selected registered voters was conducted. 131 said they'd vote for Brown, 259 said they'd vote for Feliz, and 10 were undecided.Give the sample statistic for the proportion of voters surveyed who said they'd vote for Brown. Note: The proportion should be a fraction or decimal, not a percent. This sample statistic suggests that we might expect of the 7000 registered voters to vote for Brown.
Suppose you are representing the employees at a large corporation during contract negotiations. You have a list of the salaries of all the employees at the corporation (The salaries include the many lower level employees and the few high paid management employees) and you plan to find a measure of center (e.g. mean, median, or mode).a. Which measure or center would you use to represent the employees in an effort to support your claim that the average salary of lower level employees is much lower than the national average (for lower level employees) and thus should be increased? Mean Mode Median b. Why is this the better choice?
Emma owns a toy store. If she wants to estimate the amount of revenue the company earns annually, what is the problem with selecting data points from November and December as the sample period? Select all that apply. a.) A sample must include all data points from the entire year. b.) The sample would not be representative of revenue throughout the year. c.) The sample would likely overestimate revenue due to holiday sales.
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 95% confident that the sample percentage is within 4.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 35% of air passengers prefer an aisle seat. n = (Round up to the nearest integer.) ? Enter your answer in each of the answer boxes, MacBook DII DD 20 000 000 F10 F11 F12 esc F5 F6 F7 F8 F9 F1 F2 F3 F4 & ( ) ! @ # 1 2 4 5 6. 7 8 { Q W E R Y U P tab %3D K L %24
1. You want to know the number of fans at the Miami Dolphins and Dallas Cowboys game that think the Dolphins will win. You survey 50 fans with season tickets for the Dolphins. a. What is the population of your survey? b. What is the sample of your survey? c. Is the sample biased or unbiased? Explain.
Online Medical Info USA Today posted this question on its website: “How often do you seek medical information online?” Of 1072 Internet users who chose to respond, 38% of them responded with “frequently.” What term is used to describe this type of survey in which the people surveyed consist of those who decided to respond? What is wrong with this type of sampling method?
520 students from UC Berkeley are surveyed about whether they are from Northern California, Southern California, Central California, or from another state or country. A researcher is interested in seeing if the proportion of students from each of the four regions are all the same for all UC Berkeley students. The table below shows the outcome of the survey. Fill in the expected frequencies. Frequencies of UCB Students' Home Towns Outcome Frequency Expected Frequency Northern California Southern California Central California Out of State 189 152 170 1000
Sony wants to administer a satisfaction survey to its current customers. Using their customer database, the company randomly selects 90 customers and asks them about their level of satisfaction with the company. What type of sampling is used? O A. Systematic O B. Stratified O C. Convenience O D. Simple random O E. Cluster
1. Explain the difference between z-tests (which use categorical data), and t-tests (which use numerical data). 2. Conduct a t-test, both when given statistics, and when given data. 3. Conduct a t-test, 2-sample t-test, and paired t-test. 4. Differentiate between the five types of tests we have learned so far.
A political campaign wants to estimate the number of adult residents who voted in the last city election. Answer the following. (a) Which of the following surveys probably would best represent the entire adult population of the city? 50 senior residents are randomly selected; 42 voted in the last election. 50 adult residents are randomly selected from the city; 25 voted in the last election. 50 business owners are randomly selected; 38 voted in the last election. (b) There are 16,800 adults who live in the city. Using your answer from part (a), estimate the number of adults who voted in the last city election. adults
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 95% confident that the sample percentage is within 5.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 33% of air passengers prefer an aisle seat. n3= (Round up to the nearest integer.)
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 5.5 percentage points of the true population percentage. Complete parts (a) and (b) below. a. Assume that nothing is known about the percentage of passengers who prefer aisle seats. (Round up to the nearest integer.) b. Assume that a prior survey suggests that about 38% of air passengers prefer an aisle seat. (Round up to the nearest integer.)

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