According to a (somewhat) recent Digital Trends article, 43% of all U.S. cellphone users are iPhone...

According to a (somewhat) recent Digital Trends article, 43% of all U.S. cellphone users are iPhone users. You believe this value is too low. You randomly select 100 of your peers that have cellphones and have determined that 52% of your sample are iPhone users. What is the probability of randomly selecting 100 cellphone users where the proportion who are iPhone users is more than 0.52? a. What type of distribution are you using? Pick one of the following: “uniform distribution,” “normal distribution,” “sampling distribution for ?̅,” and “sampling distribution for ?̂.” b. Is the distribution normal? How do you know? c. What are the mean and standard deviation of your distribution? d. Sketch a picture, shade, then find the probability of randomly selecting 100 cellphone users where the proportion who are iPhone users is more than 0.52. e. Look at your answer from part d. You collect another sample of 100 people and calculate the proportion of them who are iPhone users, would you expect to get similar results to what you saw (52% of your sample being iPhone users)?..

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orchestra answered 2 years ago

According to a (somewhat) recent Digital Trends article, 43% of all U.S. cellphone users are iPhone users.

According to a (somewhat) recent Digital Trends article, 43% of all U.S. cellphone users are iPhone users. You believe this value is too low. You randomly select 100 of your peers that have cellphones and have determined that 52% of your sample are iPhone users. What is the probability of randomly selecting 100 cellphone users where the proportion who are iPhone users is more than 0.52? a. What type of distribution are you using? Pick one of the following: “uniform...

According to a article, 43% of all U.S. cellphone users are iPhone users. You believe this...

According to a article, 43% of all U.S. cellphone users are iPhone users. You believe this value is too low. You randomly select 100 of your peers that have cellphones and have determined that 52% of your sample are iPhone users. What is the probability of randomly selecting 100 cellphone users where the proportion who are iPhone users is more than 0.52? a. What type of distribution are you using? Pick one of the following: “uniform distribution,” “normal distribution,” “sampling...

(1 point) Comfortable retirement. According to a recent Gallup poll on personal finances, 43% of U.S....

(1 point) Comfortable retirement. According to a recent Gallup poll on personal finances, 43% of U.S. workers say they feel they will have enough money to live comfortably when they retire. The superintendent of a large school district thinks that her employees might not be as optimistic. She takes a simple random sample of 50 district employees, and only 19 of them say they feel they will have enough money to live comfortably when they retire. Round all answers to...

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Suppose that, according to a recent census, the income per capita measured in U.S. dollars was...

Suppose that, according to a recent census, the income per capita measured in U.S. dollars was $42 comma 793 in country A and $46 comma 210 in country B. Assume that income per capita is Normally distributed with a standard deviation equal to 29% of the mean for each country. A random sample of eight people in country A and eight people in country B is selected. a) What is the probability that the mean income of the sample from...

According to a Pew Research Center study, in May 2011, 43% of all American adults had...

According to a Pew Research Center study, in May 2011, 43% of all American adults had a smart phone (one which the user can use to read email and surf the Internet). A communications professor at a university believes this percentage is higher among community college students. She selects 355 community college students at random and finds that 162 of them have a smart phone. Then in testing the hypotheses: H 0 : p = 0.43 versus H a :...

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