10.20 Smartphones and purchases. A research study asked 4024 smartphoneusers about how they used their phones. In response to a question aboutpurchases, 2057 reported that they purchased an item after using theirsmartphone to search for information about the item.a. What is the sample size n for this survey?b. In this setting, describe the population proportion P in a short sentence.c. What is the count X? Describe the count in a short sentence.d. Find the sample proportion p.e. Find SE, the standard error of p.f. Give the 959% confidence interval for P in the form of estimate plus orminus the margin of error.g. Give the confidence interval as an interval of percents.

Answered: 10.20 Smartphones and purchases. A…

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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Which of the following is NOT a voluntary response sample? Choose the correct answer below. OA. A survey is taken at a mall by asking passersby if they will fill out the survey. OB. A local dentist asks her patients to fill out a questionnaire and mail it back to determine the quality of the care received during an office visit. OC. A radio station asks for call-in responses to a question concerning city recycling. O D. Quiz scores from a college level statistics course are analyzed to determine student progress.
Here is a set of sample data. 43 75 64 40 50 11 91 99 44 82 39 25 35 86 60 2 27 83 45 65 1 93 88 10 Base on the data above, identify the 5 number summary
Here is a set of sample data. 76 77 55 35 58 6 25 37 38 85 45 54 98 78 84 31 93 15 88 52 83 7 90 71 60 66 14 17 Base on the data above, identify the 5 number summary
A survey of 1001 adults taken by Associated Press- Ipsos asked “How accurate are the weather forecasts 3.12 in your area?" (San Luis Obispo Tribune, June 15, 2005). The responses are summarized in the table below. Extremely 4% Very 27% Somewhat 53% Not too 11% Not at all 4% Not sure 1% a. Construct a pie chart to summarize these data. b. Construct a bar chart to summarize these data. c. Which of these charts-a pie chart or a bar chart– best summarizes the important information? Explain.
How is a sample related to a population? Choose the correct answer below. OA. A sample is a subset of a population. OB. A sample is a numerical measure that describes a sample characteristic. OC. A sample is the collection of all outcomes, responses, measurements, or counts.
How is a sample related to a population? Choose the correct answer below. O A. A sample is a subset of a population. O B. A sample is a numerical measure that describes a sample characteristic. O C. A sample is the collection of all outcomes, responses, measurements, or counts.
Help. a. About what percent of women in North Arerica are between 58 and 68.5 inches tall? b. About what percent of women in North America are less than 65 inches tall? c. In what range do the middle 99.7% of women's height lie? d. About what percent of women in North America are at least 61.5 inches tal?
A J.D. Power and Associates vehicle quality survey asked new owners a variety of questions about their recently purchased automobile. One question asked for the owner's rating of the vehicle using categorical responses of average, outstanding, and exceptional. Another question asked for the owner's education level with the categorical responses some high school, high school graduate, some college, and college graduate. Assume the sample data below are for 500 owners who had recently purchased an automobile. Education Quality Rating Some HS HS Grad Some College College Grad Average 30 30 20 60 Outstanding 50 50 50 90 Exceptional 20 20 30 50 a. Use a 0.05 level of significance and a test of independence to determine if a new owner's vehicle quality rating is independent of the owner's education. Compute the value of the x test statistic (to 2 decimals). Use Table 3 of Appendix B to find the p-value. The p-value is - Select your answer - What is your conclusion? - Select your answer - v…
1250 were surveyed, 911 drank alcohol or used illegal drugs, 425 drank alcohol only. How many drank alcohol and used illegal drugs, but did not smoke cigarettes?
7. Wondering if there is a connection between a person's height and the number of tattoos they have, Mac asks 50 people how tall they are and how many tattoos they have. What type of study was used? a. Experimental b. Observational
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