7. It is possible to directly compare the results of a confidence interval estimate to theresults obtained by testing a null hypothesis if:a. a two-tailed test is usedb. a one-tailed test is usedc. both of the previous statements are trued. none of the previous statements is true.

Our aim is to find the correct option.

Answered: It is possible to directly compare the…

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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Construct the 99% confidence interval estimate of the population proportion p if the sample size is n = 700 and the number of successes in the sample is x 56. Give your answers to 4 decimal places, and use at least 3 decimal places in your critical value. Which of the following is the correct interpretation for your answer in part (a)? OA. There is a 99% chance that the percentage of successes in the population lies in the interval OB. We can be 99% confident that the percentage of successes in the population lies in the interval OC. We can be 99% confident that the percentage of successes in the sample lies in the interval OD. None of the above
A 95% confidence interval for the mean (u) of a population is computed from a random sample and found to be 9 ± 3. Which of the following is a correct statement? O a. if we took many, many additional random samples and from each computed a 95% confidence interval for H, approximately 95% of these intervals would contain u. O b. 95% of values sampled are between 6 and 12. O c there is a 95% probability that the true mean is 9 and a 95% chance that the true margin of error is 3. O d. there is a 95% probability that u is between 6 and 12. O e. all of the above are true.
Ezekiel wants to use an interval from a sample based on z-scores to estimate the proportion of seniors in his school who have a smartphone. He takes a MORE of 20 out of the total 100 seniors and finds that 12 of those sampled have a smartphone. What conditions for constructing this confidence interval does Ezekiel's sample satisfy? Choose all the appropriate answers: The data is a random sample from the population of interest The observed scores of successes and failures are large enough Individual observations can be considered independent
Suppose that in a random sample of 600 employed Americans, there are 55 individuals who say that they would fire their boss if they could. Calculate a 90% confidence interval for the population proportion who would fire their boss if they could. (Round the answers to three decimal places.) ______to______
1) When we compute a 95% confidence interval (CI) using a sample meana. 95% of the time it will include the population mean b. we have an interval estimate of population meanc. 5% of the time it will not include the population mean d. we can't be absolutely sure population mean is in the CIe. all the above are correct 2) In R, what argument does the function: str( ) expect? a. name of an object b. proper punctuation c. xlim d. plot e. col=8 f. pch g. The function name h. none of the above
How would a 90% interval compare with the others in width? A. A 90% interval would be narrower than the 95% confidence interval but wider than the 80% confidence because intervals get narrower with increasing confidence level. B. A 90% interval would be wider than the 95% confidence interval but narrower than the 80% confidence because intervals get narrower with increasing confidence level C. A 90% interval would be wider than the 95% confidence interval but narrower than the 80% confidence because intervals get wider with increasing confidence level. D. A 90% interval would be narrower than the 95% confidence interval but wider than the 80% confidence because intervals get wider with increasing confidence level.
A corresponding relationship between confidence intervals and two-tailed hypothesis tests also is valid for other parameters, such as p, ?1 − ?2, or p1 − p2, which we will study in later sections.) Whenever the value of k given in the null hypothesis falls outside the c = 1 – α confidence interval for the parameter, we reject H0. For example, consider a two-tailed hypothesis test with ? = 0.01 and H0: ? = 21H1: ? ≠ 21 A random sample of size 30 has a sample mean x = 22 from a population with standard deviation ? = 3. (a) What is the value of c = 1 − ?? Using the methods of Chapter 7, construct a 1 − ? confidence interval for ? from the sample data. (Round your answers to two decimal places.) lower limit upper limit
Which interval is which? Alessandro constructed three confidence intervals, all from the same random sample. The confidence levels are 90%, 95%, and 99%. The confidence intervals are I. 7.4<μ<8.6 II. 7.1
6
For each problem, select the best response
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
A95% confidence interval for p, the true proportion of all shoppers at a large grocery store who purchase 2% milk, was found to be (0.436, 0.582). Given that all conditions were met, which of the following is the most appropriate conclusion? O Based upon these data, at least 58.2% of shoppers purchase 2% milk. O Based upon these data, less than 50%% of shoppers purchase 2% milk. O Based upon these data, the majority of shoppers purchase 2% milk. O Based upon these data, at least 43.6% of shoppers purchase 2% milk. O Based upon these data, 95% of shoppers purchase 2% milk. * Previous

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It is possible to directly compare the results of a confidence interval estimate to the results obtained by testing a null hypothesis if: a. a two-tailed test is used b. a one-tailed test is used c. both of the previous statements are true d none cof the previous statements is true