The following are true about confidence intervals: a. they indicate the presence or otherwise of a statistical difference between two populations b. the intervals are larger with smaller sample size c. the intervals give a range of values within which the true value will lie. d. a 95% confidence interval means that 95% of all observed values fall within that interval. e. None of the above.

The following are true about confidence intervals: a. they indicate the presence or otherwise of a statistical difference between two populations b. the intervals are larger with smaller sample size c. the intervals give a range of values within which the true value will lie. d. a 95% confidence interval means that 95% of all observed values fall within that interval. e. None of the above.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

An analyst stated that all else equal, increasing sample size will decrease both the standard error and the width of the confidence interval. The analyst's statement is correct is regard to: a. The standard error, but incorrect in regard to the confidence interval b. both the standard error and confidence interval c. The confidence interval but incorrect in regard to the standard error
...
11. Describe the effect that an increase in each of the following has on the width of a confidence interval: eh) a. The level of confidence (while holding the sample size and standard deviation constant). b. The sample size (while holding the confidence level and standard deviation constant). c. The standard deviation (while holding the sample size and confidence level constant).
10. Which one of the following statements about confidence intervals is false? A. Given the same sample of data, a 90% confidence interval will be narrower than a 95% confidence interval. B. The size of the population does not affect the width of a confidence interval. C. The population proportion determines the center of the confidence interval. D. The value of z* affects the width of a confidence interval. E. The general format of a confidence interval is “sample statistic ± margin of error.”
If (30, 110) is a 95% confidence interval for the population mean µ, then the point estimate for u is O a. 70. O b. 80 O c. 30 O d. None of these O e. 110
4.A prior study(by Pew Research 2021)found that 35 out of 50 randomly selected US adults between the ages of 18 to 29 use (or have used) Instagram. Construct a 99% confidence interval for the population proportion of US adults between the ages of 18 to 29 use (or have used) Instagram. (round to three decimal places) a.Identify the following: X, N, P b.Which distribution should you use for this problem? c.What is the corresponding critical value for a 99% confidence interval? d.Calculate the margin of error (3 decimal places) e.Construct a 99% confidence interval f. Interpret the interval.
Which of the following is the correct interpretation of a 90% confidence interval such as 0.15 < p < 0.56? a. 90% of all data values fall between o.15 and o.56. O b. We are 90% confident that the interval from o.15 to o.56 will contain the true value of p. c. 90% of the population proportions fall between o.15 and o.56. O d. There is a 90% chance that p will fall between o.15 and o.56.
At a charter high school, the average GPA of a high school senior is known to be normally distributed. After a sample of 27 seniors is taken, the average GPA is found to be 2.85 and the sample variance is determined to be 0.16. Find a 95% confidence interval for the population mean GPA. a. 2.5615 to 2.8585 b. 2.6358 to 3.0642 c. 2.6917 to 3.0083 d. 2.5167 to 2.9033
Suppose a researcher takes a random sample of 1,000 students from a university and creates a 95% confidence interval for the true proportion of left handed students at the university. Which of the following is true about this interval when compared with a 95% confidence interval based on a random sample of 600 students from the same university? a. The interval based on a sample of 600 students will be wider than the interval based on a sample of 1,000 students. b. The lower and upper endpoints of the 95% CI based on 600 students will both be larger than the corresponding lower and upper endpoints of the 95% CI based on 1,000 students. c. 95% CIs based in samples of 1,000 students are more likely to include the true population proportion than 95% CIs based on samples of 600 students. d. The interval based on a 1,000 students will be wider than the interval based on 600 students. 2. If the researchers above wished to decrease the width of the mean confidence interval for the mean age…
The following questions are concerned with confidence interval estimation of one population mean. (true or false) a. The margin of error can be determined if one knows only the length of the confidence interval b. The confidence interval can be obtained if one knows the margin of error and the sample mean c. The sample mean can be determined if one knows the endpoints of the confidence interval