A company that produces cell phones claims its standard phone battery lasts longer on averagethan other batteries in the market. To support this claim, the company publishes an ad reporting theresults of a recent experiment showing that under normal usage, their batteries last at least 35hours. To investigate this claim, a consumer advocacy group asked the company for the raw data,which are shown to the right. Find a 95% confidence interval and state your conclusion. Explainhow you dealt with any outliers.Plot the data. Choose the correct histogram below.O A.# of Batteries12-68642060Battery Life (hours)Q# of BatteriesB.ܘ ܘ ܗ ܝ ܩ ܩ60Battery Life (hours)O C.possible# of Batteriesܘ ܗ ܟ ܚ ܚ ܝ ܘ60Battery Life (hours)QO D.# of Batteries12-26864 NO0-Time343435313034Time Remaining: 01:47:42303533553032060Battery Life (hours)Are any of the observations outliers? Explain.O A. The histogram shows that there is one extreme outlier. Since the sample size is large enough, the Nearly NormalCondition is still satisfied.0OB. The histogram shows that there is one extreme outlier. With this value included, the conditions for inference areviolated.Next

Given data : Time : { 34,34,35,31,30,34,30,35,33,55,30,32 } To make histogram first write down the…

Answered: A company that produces cell phones…

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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A study investigated ways to prevent staph infections in surgery patients. The researchers examined a random sample of 100 patients admitted to various hospitals for surgery. They found that 53 of these patients tested positive for Staphylococcus aureus, a bacterium responsible for most staph infections. Construct a 80% confidence interval for the proportion of all patients admitted for surgery who are carriers of S. aureus. Round your answers to three decimal places, and use four decimal places for any interim calculations. We are 80% confident that the interval ( of all patients admitted for surgery who are carriers of S. aureus. contains the true population proportion p
A trade magazine routinely checks the drive-through service times of fast-food restaurants. A 95% confidence interval that results from examining 734 customers in one fast-food chain's drive-through has a lower bound of 169.8 seconds and an upper bound of 173.4 seconds. What does this mean? Choose the correct answer below. O A. One can be % confident that the mean drive-through service time of this fast-food chain is between seconds and seconds. O B. There is a % probability that the mean drive-through service time of this fast-food chain is between seconds and seconds. O C. The mean drive-through service time of this fast-food chain is seconds % of the time. O D. One can be % confident that the mean drive-through service time of this fast-food chain is seconds.
Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,135 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,135 surveyed, 474 indicated that they were satisfied. Construct a 90% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. What are the null and alternative hypotheses? Ho: P versus H₁: p (Round to two decimal places as needed.) (…)
A study is conducted by a physical therapist to determine whether there is a difference in the proportion of men and women in the U.S. that participate in regular sustained physical activity. It is found that 22% of menout of 550 and 19.5% of women out of 450 participated in regular sustained physical activity. Construct a 90% confidence interval for the difference in proportions of men and women that participate in regular sustained and state your conclusion.
A recent poll indicated that 42% of men supported raises taxes to fund additional park services. The poll also found that 64% of women supported such a tax. The sample consisted of 29 men and 25 women. Construct a 90% confidence interval around the difference in proportions.
A survey is taken of 250 students, and a P of 0.45 is found. The same survey is repeated with 1,000 students, and the same value is found. Compare the two 95% confidence intervals. What is the relationship? Is the margin of error for the second one four times smaller? How much smaller is it?
We want to determine if the true proportion of students who consume caffeine is not equal to 35%. We can use a confidence interval to determine this. O True False
Several years ago, 42% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,175 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,175 surveyed, 473 indicated that they were satisfied. Construct a 99% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed. What are the null and alternative hypotheses? Ho: p versus H1: p (Round to two decimal places as needed.)
Several years ago, 45% of parents who had children in grades K-12 were satisfied with the quality of education the students receive. A recent poll asked 1,025 parents who have children in grades K-12 if they were satisfied with the quality of education the students receive. Of the 1,025 surveyed, 484 indicated that they were satisfied. Construct a 99% confidence interval to assess whether this represents evidence that parents' attitudes toward the quality of education have changed.
In a study designed to determine whether there was a cluster of brain cancer cases at a Pratt & Whitney plant, record from 223,000 employees were studied and 723 employees with brain tumors were found. Treat those employees as a random sample and construct a 95% confidence interval estimate of the proportion of all adults who develop such tumors. write a brief statement interpreting that confidence interval.
Suppose NBC has asked the same question to a sample of 1296 adults nine months earlier, finding 47% with an optimistic outlook for the year ahead. Develop a 95% confidence interval for the percentage of American adults who had an optimistic outlook for the economy nine months earlier.
Public Policy Polling recently conducted a survey asking adults across the U.S. about music preferences. When asked, 80 of the 571 participants admitted that they have illegally downloaded music. Without performing any calculations, describe how the confidence interval would change if the confidence level changed from 99% to 90%.

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