QUESTION 14The telephone company has the business objective of wanting to estimate the proportion of households that wouldpurchase an additional telephone line if it were made available at a substantially reduced installation cost. Data arecollected from a random sample of 500 households. The results indicate that 135 of the households would purchasethe additional telephone line at a reduced installation cost.Construct a 90% confidence interval for the population proportion of households that would purchase the additionaltelephone line.Da. (0.693, 0.759) O b.(0.232, 0.311) Oc. (0.237, 0.303) O d. (0.231, 0.309)

Givensample size(n)=500x=135p^=xn=135500=0.27confidence interval = 90%

Answered: QUESTION 14 The telephone company has…

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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QUESTION 28 The following are body mass index (BMI) scores measured in 12 patients who are free of diabetes and are participating in a study of risk factors for obesity. Body mass index is measured as the ratio of weight in kilograms to height in meters squared. Generate a 95% confidence interval estimate of the true BMI. 25 27 31 33 26 28 38 41 24 32 35 40
QUESTION 3 A hardware store determined the current balances for a random sample of 100 customers with non-zero balances. The sample mean of the amount owed was $100.00 and the standard deviation was $25. Use the assumption that the sample standard deviation is equal to the population standard deviation. How many customers should be included in the sample if the desired 95% confidence interval has a desired error margin E of $2.00?
QUESTION 16 In 2005, Health Canada claimed that 16.6% of Canadian adults are obese. A researcher wanted to check whether this percentage has increased in 2009. He randomly selected 160 Canadian adults and found 30 of them are obese. He wants to develop a 92% confidence interval for the obese percentage in 2009. Write down the critical value
Question 9: compute a 95% confidence interval for the average blood pressure range of any individual that will take the blood pressure medication.
Question 2 The Medical Association of Trinidad and Tobago is interested in determining the impact of a new drug on the cholesterol levels of women. Data was collected from 11 women diagnosed with high cholesterol. The data below shows the cholesterol levels before and after the drug was administered. Cholesterol Levels in mg/dL Before 227 289 257 228 303 275 262 290 244 233 179 After 134 240 230 186 265 242 242 281 240 212 215 a. Calculate a 95% confidence interval for the mean cholestoral level (i) before drug and (ii) after drug. b. Test the hypothesis that the average cholesterol levels before and after administering the pill are equal for both mechanics are equal. Use the 1% level of significance.
QUESTION 3 The GPAs of nursing students (p1) were compared to GPAs of student-athletes (p2) were compared. Of a sample of 400 randomly and independently selected nursing students, 75% were placed on honor roll. Of a sample of 100 athletes, 80% of the students were placed on honor roll. Calculated the UPPER bound of the 95% confidence interval for the two samples. Round to the nearest hundredth.
QUESTION 17 Suppose an internet marketing company wants to determine the current percentage of customers who click on ads on their smartphones. A random sample of 1000 customers is selected and 120 of them click on ads on their smartphones. Find the upper confidence limite (UCL) of the 98% confidence interval estimate for the population proportion of customers who click on ads on their smartphones. Round your answer to three decimal places.
Question 11: use this information to construct a 95% confidence interval for the proportion of the population that will reject relocation offers due to family considerations.
QUESTION 9 A random sample of 500 ZU students are surveyed to determine if they own a tablet. It was found that a 95% confidence interval of the true population proportion of ZU students who own tablets is (0.406, 0.494). Find the point estimator of the true population proportion of ZU students who own tablets. Round your answer to two decimal places.
Question 2: In order to determine the miles per gallon rating for a new midsize minivan, an automaker randomly selected a sample of 50 vehicles. The showed = 31.56 mpg with s=.798 mpg. At 95% confidence, what is the minimum mpg rating you could give the car?
QUESTION 1 A hardware store determined the current balances for a random sample of 100 customers with non-zero balances. The sample mean of the amount owed was $100.00 and the standard deviation was $25. Use the assumption that the sample standard deviation is equal to the population standard deviation. You are asked to find a confidence interval for the average amount owed by all customers with a non-zero balance. Which Minitab procedure would be most appropriate to use for this task? O Power and Sample Size/1-Sample Z O Power and Sample Size/Sample Size for Estimation/1-Sample Z O Basic Statistics/1-Sample Z O Basic Statistics/1-Sample t
A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie. Among the 500 respondents, 13% chose chocolate pie, and the margin of error was given as ±4 percentage poits. Describe what is meant by the statement that "the margin of error was given as ±4 percentage points." (...) Choose the correct answer below. OA. The statement indicates that the study is only 4% confident that the true population percentage of people that prefer chocolate pie is exactly 13%. OB. The statement indicates that the study is 100% -4% = 96% confident that the true population percentage of people that prefer chocolate pie is 13%. OC. The statement indicates that the interval 13% ± 4% is likely to contain the true population percentage of people that prefer chocolate pie. D. The statement indicates that the true population percentage of people that prefer chocolate pie is in the interval 13% ± 4%.

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