6. The manufacturer of the ColourSmart television claims that 85% of its sets la at least five years without needing a single repair. In order to test this claim, a consumer group randomly selected 400 consumers who have owned a ColourSmart television set for five years. Of these 400 consumers, 65 say that their ColourSmart television sets did need at least one repair. a. Obtain the point estimate for the proportion of all ColourSmart television sets that have lasted at least five years without needing a single repair. * Your answer b. Determine whether the condition is satisfied to use the large sample formula of the confidence interval of the population proportion. (Check the assumption to use Z distribution) Your answer C. Find a 99% confidence interval for the true proportion of all ColourSmart television sets that have lasted at least five years without needing a single repair. (Type your answer in this format: Margin error%3D 99% CI =

6. The manufacturer of the ColourSmart television claims that 85% of its sets la at least five years without needing a single repair. In order to test this claim, a consumer group randomly selected 400 consumers who have owned a ColourSmart television set for five years. Of these 400 consumers, 65 say that their ColourSmart television sets did need at least one repair. a. Obtain the point estimate for the proportion of all ColourSmart television sets that have lasted at least five years without needing a single repair. * Your answer b. Determine whether the condition is satisfied to use the large sample formula of the confidence interval of the population proportion. (Check the assumption to use Z distribution) Your answer C. Find a 99% confidence interval for the true proportion of all ColourSmart television sets that have lasted at least five years without needing a single repair. (Type your answer in this format: Margin error%3D 99% CI =

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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In March 2017, 9,195 men took trips with median duration of 300 seconds, and 2,439 women took trips with median duration of 319 seconds, on New York City's ride sharing program, Citibike. Overall, what was the median duration of all Citibike ride trips that month? A. 304 seconds B. 315 seconds C. 309.5 seconds D. None of these. E. Cannot be determined
The average time that Italy commute to work is 23.15 minutes (Best 4 Tourist Places, June 15, 2020). The average commute times in minutes for 18 cities are given in Table 3.1. Table 3.1 City Time (minutes) Rome 24.9 Milan 26.8 Naples 26.2 Turin 28.1 Palermo 31.7 Genoa 25.8 Bologna 23.3 Florence 32.1 Bari 28.5 Catania 24.4 Verona 29.3 Venice 24.8 Messina 38.1 Padua 28.3 Trieste 28.4 Taranto 24.6 Prato 20.1 Modena 23.4 1) What is the mode for these 18 cities? 2) Find 28th and 77th Percentile of commute times for these 18 cities.
The average time that Italy commute to work is 23.15 minutes (Best 4 Tourist Places, June 15, 2020). The average commute times in minutes for 18 cities are given in Table 3.1. Table 3.1 City Time (minutes) Rome 24.9 Milan 26.8 Naples 26.2 Turin 28.1 Palermo 31.7 Genoa 25.8 Bologna 23.3 Florence 32.1 Bari 28.5 Catania 24.4 Verona 29.3 Venice 24.8 Messina 38.1 Padua 28.3 Trieste 28.4 Taranto 24.6 Prato 20.1 Modena 23.4 a) What is the variance and standard deviation of commute times for these 18 cities? b) Find the z – score value of commute time for these 18 cities. c) Find 28th and 77th Percentile of commute times for these 18 cities.
Question D. Give a 95% interval estimate of the number of fatal accidents per 1000 licenses in a city where 15% of the licensed drivers are under 21. Same data set as above.
A researcher wants to determine the percentage of American teenagers who send or receive text messages while doing homework. Which of the following techniques would likely be the MOST efficient way of obtaining an accurate estimate for this percentage? 1. Randomly select teenagers from the list of all teenage students in every state in America and mail surveys to those teens, asking them if they send or receive text messages while doing homework. 2. Send a survey to every teenager in America and ask them if they send or receive text messages while doing homework. 3. Randomly select teenagers from the list of all teenage students in one state and mail surveys to those teens, asking them if they send or receive text messages while doing homework.
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A hospital wants to estimate the percentage of admitted patients who receive Medicare benefits. If we want to estimate that percentage based on examination of randomly selected patient payment records, how many patient records must be examined in order to be 90% confident that we are within four percentage points of the population percentage?
A group of 40 students in a library was sampled and the type of laptop they were using was examined. It was found that 16 were using HP, 10 were using Lenovo, 6 were using Dell, 5 were using Microsoft, and 3 were using Apple. a. Use the given information to complete the following table: Laptop Type Frequency Relative Frequency HP % Lenovo c. What proportion of the students use HP? b. How many degrees will the segment representing "Lenovo" have on a pie chart? % d. What is the relative frequency for Apple? Dell Microsoft Apple