Part A. Which of the following statements is/are always true? [Select]I. A confidence interval will be widened if the confidence level is decreased and the sample sizeis increased.II. By increasing the sample size, the precision of confidence interval is increased. ✓ [Select]Neither I nor III onlyBoth I and IIIl only

For the given statement Select the true statement

Answered: Part A. Which of the following…

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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John Charleston owns a heating oil delivery company that services 1,540 residences. John would like to estimate the number of customers that have oil storage tanks that are less than 100 gallons in capacity. A random sample of 200 customers found that 48 had an oil tank that was less than 100 gallons. The 99% confidence interval to estimate the proportion of customers with oil tanks less than 100 gallons is ________. A) (0.212, 0.268) B) (0.225, 0.255) C) (0.167, 0.313) D) (0.184, 0.296)
We want to obtain a 95% confidence level for the national smoking prevalence (i.e., the population proportion). A SRS of n=80 finds 16 smokers. If using plus four method, what is the confidence interval? answer choices (0.126, 0.302) (0.162, 0.338) (0.120, 0.308) (0.112, 0.288)
Explain which would result in a wider large-sample confidence interval for p: a 90% confidence level or a 95% confidence level? (Hint: Consider the confidence interval formula.) a. For any given sample, the 90% confidence interval is wider than the 95% confidence interval because the z critical value for a 90% confidence interval is smaller than the z critical value for a 95% confidence interval. b. For any given sample, the 90% confidence interval is wider than the 95% confidence interval because the z critical value for a 90% confidence interval is larger than the z critical value for a 95% confidence interval. c. For any given sample, the 95% confidence interval is wider than the 90% confidence interval because the z critical value for a 95% confidence interval is smaller than the z critical value for a 90% confidence interval. d. For any given sample, the 95% confidence interval is wider than the 90% confidence interval because the z critical value for a 95% confidence interval…
4 For estimating one proportion, when would you typically choose the bootstrap confidence interval over a classical (mathematical) confidence interval? O You don't have the required ten successes and ten failures. O You don't have a random sample. O You don't have a sample of size 30.
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In a survey of 2206 adults in a recent year, 1200 say they have made a New Year's resolution. Construct 90% and 95% confidence intervals for the population proportion. Interpret the results and compare the widths of the confidence intervals. The 90% confidence interval for the population proportion p is ________ (Round to three decimal places as needed.)
What is the correct interpretation for a 95% confidence interval of the population mean μ? The probability that the population mean is in the interval is 5%. In the long run, 95% of the intervals created will contain the population mean. There is a 5% chance that the sample mean will be in the interval. 95% of the population has a value in the confidence interval.
d. What is the lower bound of the confidence interval? e. What is the upper bound for the confidence interval? f. Interpret the confidence interval you have calculated
If a confidence interval is __________, this means the point estimate is not directly in the center of the interval. A. two-sided B. symmetric C. non-symmetric D. inferential
Drug Tests There is a 3.9% rate of positive drug test results among workers in the United States (based on data from Quest Diagnostics). Assuming that this statistic is based on a sample of size 2000, construct a 95% confidence interval estimate of the percentage of positive drug test results. Write a brief statement that interprets the confidence interval.
Explain what "98% confidence" means in a 98% confidence interval, What does "98% confidence" mean in a 98% confidence interval? O A. If 100 different confidence intervals are constructed, each based on a different sample of sizen from the same population, then we expect 98 of the intervals to include the parameter and 2 to not include the parameter. O B. The probability that the value of the parameter lies between the lower and upper bounds of the interval is 98%. The probability that it does not is 2%. O C. The confidence interval includes 98% of all possible values for the parameter. O D. The value of the parameter lies within 98% of a standard deviation of the estimate. O Time Remaining: 02:19:13 Next MacBook Pro G Search or type URL esc & #3 %24 7 8 4 1 T Y

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Part A. Which of the following statements is/are always true? [Select] I. A confidence interval will be widened if the confidence level is decreased and the sample size is increased. II. By increasing the sample size, the precision of confidence interval is increased.