2. A coffee shop offers four different blends of coffee. A taste was conducted and 100 randomlychosen individuals were asked which blend they liked best. The answers were as follows:BlendChosen by120230335415Table 1: Coffee Preference(a) Define the experiment being conducted. How many times was it repeated?(b) What probabilities would you assign to the preference to each blend? What method areyou using?

Using the relative frequency method to determine probabilities in this case is beneficial since it…

Answered: 2. A coffee shop offers four different…

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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Software Upgrade A software company is trying to decide whether to produce an upgrade of one of its programs. Customers would have to pay $100 for the upgrade. For the upgrade to be profitable, the company must sell it to more than 20% of their customers. You contact a random sample of 60 customers and find that 16 would be willing to pay $100 for the upgrade. Do the sample data give convincing evidence that more than 20% of the company's customers are willing to purchase the upgrade? Carry out an appropriate test at the a=0.05 significance level. Which would be a more serious mistake in this setting-a Type I error or a Type II error?
The survey has bias. (a) Determine the type of bias. (b) Suggest a remedy. A polling organization conducts a study to estimate the percentage of households that have high-speed Internet access. It mails a questionnaire to 1313 randomly selected households across the country and asks the head of each household if he or she has high-speed Internet access. Of the 1313 households selected, 11 responded. (a) Which of these best describes the bias in the survey? O Response bias O Sampling bias O Undercoverage bias O Nonresponse bias (b) How can the bias be remedied? OA. The polling organization should mail the questionnaire to a greater number of households. OB. The polling organization should only select households in a single state. OC. The polling organization should mail the questionnaire to each person in the households. OD. The polling organization should try contacting households that do not respond by phone or face-to-face.
The contingency table below shows the results of a survey of video viewing habits by age. Video Viewing Platform Preferred Viewer AgeMobile/Laptop Device TV Screen Row Total18–34 32 35 67 35–54 11 11 22 55+ 4 7 11 Column Total 47 53 100 Find the following probabilities or percentages: (e) Percentage of viewers who are 35–54 or prefer videos on a mobile or laptop device. Percentage of viewers %
In the following scenario, identify the type(s) of bias, and either explain why the results of the study are worrisome, or why you think there is no bias. (NOTE: You may pick more than one type if you find it necessary). A group of researchers wanted to study United States citizens' perception on assault rifle ownership. To generate their sample, they identified all towns of 1000 people or fewer in the U.S., randomly selected 20 of those towns, and mailed a total of 4500 surveys to every household in those towns. The survey asked, "With the recent increase in gun violence incidents, would you support a nationwide ban on assault rifles?"; it also included a stamped return envelope so that participants could return the survey at no cost to themselves. Of the 1281 responses, 28% of the respondents answered the survey with a "yes." a) Sampling bias b) Response bias c) Nonresponse bias d) No bias
The table shows the preferences of 40 students surveyed about the design of a new t-shirt for students who are graduating this year. Sleeves short sleeves long sleeves pink 12 5 black 14 9 What is the probability that a student surveyed, selected at random, preferred a pink t-shirt with long sleeves?
The percentage distribution of the number of occupants invehicles crossing the Tacoma Narrows Bridge in Washington is shown in the pie chart.Find each probability. (Source: Washington State Department of Transportation.)(a) Randomly selecting a car with two occupants(b) randomly selecting a car with two or more occupants(c) Randomly selecting a car with between two and five occupants,inclusive One = 55.5% Two = 29.8% Three = 7.6% Four = 4.7% Five = 1.4% Six or more = 1%
A group of 11 students was selected at random and asked for their high school GPA and their freshmen GPA in college the subsequent year. The results were: Student High School GPA Freshmen GPA 1 2.0 1.6 2 2.2 2.0 3 2.6 1.8 4 2.7 2.8 5 2.8 2.1 6 3.1 2.0 7 2.9 2.6 8 3.2 2.2 9 3.3 2.6 10 3.6 3.0 We would like to know whether there is a linear relationship between the high school GPA and the college freshmen GPA, and we would like to be able to predict the freshmen GPA, if we know that the high school GPA of another student is, say, 3.4. Provide the two requested scatter plots for this data (put college freshman GPA on the Y (vertical) axis!). a) What would be your approximate 95% prediction interval for question (g)? b) Show your scatterplot with the predicted trend line below
A group of 11 students was selected at random and asked for their high school GPA and their freshmen GPA in college the subsequent year. The results were: Student High School GPA Freshmen GPA1 2.0 1.62 2.2 2.03 2.6 1.84 2.7 2.85 2.8 2.16 3.1 2.07 2.9 2.68 3.2 2.29 3.3 2.610 3.6 3.0I would like to know whether there is a linear relationship between the high school GPA and the college freshmen GPA, and we would like to be able to predict the freshmen GPA, if we know that the high school GPA…
A marketer is examining the effectiveness of color scheme on the willingness to subscribe to a user's social media account. She creates three different profiles using three different color schemes: red, blue, and green. Twenty participants are asked to evaluate how much they like each of the profiles using a scale of 1 (do not like) to 5 (like a lot). What statistical procedure should you use to analyze these data? O independent groups t test O correlated groups t test O One Way Between Subjects ANOVA O One Way Repeated Measures ANOVA
How do I set #51 up?
You want to do a survey of members of the baseball team at Georgetown College to see how they feel about academic life at GC. You want to ensure that you take a simple random sample. There are several sampling strategies that you have in mind. Which one of the following strategies is a simple random sample of size 12? Group of answer choices ( ) You obtain a list of all GC baseball players. You then write the name of each player on a slip of paper and put the papers in a hat. You thoroughly shuffle the names and then select 12 slips of paper from the hat without replacement. ( ) You obtain a list of all GC baseball players and you select one of the first 5 names at random. Then, you select every fifth name on the list after that until you have 12 people selected. ( ) You obtain an alphabetically-ordered list of all GC baseball players and pick the first 12 names on the list. ( )You find out that there are 20 JV players and 40 Varsity players on the baseball…
Suppose you are the president of the student government. You wish to conduct a survey to determine the student body's opinion regarding student services. The administration provides you with a list of the names and phone numbers of the 775 registered students. (a) Discuss a procedure you could follow to obtain a simple random sample of 5 students. (b) Obtain this sample. Click the icon to view the portion of the random number table. (a) Which of the following procedures could you follow to obtain a simple random sample of 5 students? Select all that apply. A. List the names in alphabetical order and take the first five names on the list. B. List each name on a separate piece of paper; place them all in a hat, and pick five. C. Ask the students to come to a meeting and pick five from those who come to the meeting. D. Number the names from 1 to 775 and use a random number table to produce 5 different three-digit numbers corresponding to the names selected. *** C (b) Obtain this sample…

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