**Sample Size Estimation for Proportion of Adults with High-Speed Internet Access**A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 90% confidence if:(a) She uses a previous estimate of 0.52? (b) She does not use any prior estimates?\[ \text{(a) } n = \_\_\_ \text{ (Round up to the nearest integer.)} \]\[ \text{(b) } n = \_\_\_ \text{ (Round up to the nearest integer.)} \]**Table of Critical Values**| Level of Confidence, $ (1 - \alpha) \times 100\% $ | Area in Each Tail, $ \frac{\alpha}{2} $ | Critical Value, $ z_{\alpha/2} $ ||-------------------------------------------------------|------------------------------------------|--------------------------------|| 90% | 0.05 | 1.645 || 95% | 0.025 | 1.96 || 99% | 0.005 | 2.575 |**Instructions:**- Click the icon to view the table of critical values.- Use the table to determine the critical value corresponding to the desired confidence level. This will aid in calculating the required sample size.

Plug in all the values in the formula, we get Round the value to the nearest integer.

A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 90% confidence if (a) she uses a previous estimate of 0.52? (b) she does not use any prior estimates? E Click the icon to view the table of critical values. Table of critical values (a) n = I (Round up to the nearest integer.) (b) n= (Round up to the nearest integer.) Critical Value, Area in Each Tail, Level of Confidence, (1 - a) - 100% 90% 0.05 1645 95% 0.025 196 99% 0.005 2.575 Print Done

A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.03 with 90% confidence if (a) she uses a previous estimate of 0.52? (b) she does not use any prior estimates? E Click the icon to view the table of critical values. Table of critical values (a) n = I (Round up to the nearest integer.) (b) n= (Round up to the nearest integer.) Critical Value, Area in Each Tail, Level of Confidence, (1 - a) - 100% 90% 0.05 1645 95% 0.025 196 99% 0.005 2.575 Print Done

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

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 33%. You would like to be 90% confident that your estimate is within 1% of the true population proportion. How large of a sample size is required? Hint: Video [+] n =
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p = 0.68. You would like to be 97% confident that your estimate is within 2.5% of the true population proportion. How large of sample size is required n =
* 00 1C A researcher wishes to estimate the proportion of adults who have high-speed Internet access. What size sample should be obtained if she wishes the estimate to be within 0.05 with 95% confidence if (a) she uses a previous estimate of 0.52? (b) she does not use any prior estimates? Click the icon to view the table of critical values. ..... (a) n= 384 (Round up to the nearest integer.) (b) n = 384 (Round up to the nearest integer.) Next DEC MacBook Air 114 F8 08 F1 F2 F3 F5 F7 & $4 2 3. R A B ion puewwo
You intend to estimate a population mean with a confidence interval. You believe the population to have a normal distribution. Your sample size is 8. While it is an uncommon confidence level, find the critical value that corresponds to a confidence level of 93.5%.
You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 80.3. You would like to be 95% confident that your estimate is within 1 of the true population mean. How large of a sample size is required? Use a critical value rounded to three decimal places.
You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=72%p∗=72%. You would like to be 95% confident that your esimate is within 0.2% of the true population proportion. How large of a sample size is required?n = Do not round mid-calculation. However, use a critical value accurate to three decimal places.
A doctor wants to estimate the mean HDL cholesterol of all 20- to 29-year-old females. How many subjects are needed to estimate the mean HDL cholesterol within 3 points with 99% confidence assuming s = 14.7 based on earlier studies? Suppose the doctor would be content with 95% confidence. How does the decrease in confidence affect the sample size required? Click the icon to view a partial table of critical values. subjects. (Round up to the nearest subject.) subjects. (Round up to the nearest subject.) A 99% confidence level requires A 95% confidence level requires How does the decrease in confidence affect the sample size required? O A. Decreasing the confidence level increases the sample size needed. B. The sample size is the same for all levels of confidence. OC. Decreasing the confidence level decreases the sample size needed. ...
you want to obtain a sample to esimate a population proportion. Based on previous evidence, you believe the population standard devition is approximately 65.5. You would like to be 99% confident that your estimate is within 1 of the true population mean. How large of a sample size is required? Do not round mid calculation. Use a critical value rounded to three decimal places.
your car is more crowded than you think. table 5.8 reports results from a 1969 personal transportation survey on "home-to-work" trips in metropolitan areas. The survey stated that the average car occupancy was 1.4 people. check that calculation.