By how many times does the sample size have to be increased to decrease the margin of error by a factor of ? g 1 9 The s

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By How Many Times Does The Sample Size Have To Be Increased To Decrease The Margin Of Error By A Factor Of G 1 9 The S 1 (19.41 KiB) Viewed 74 times

By how many times does the sample size have to be increased to decrease the margin of error by a factor of ? g 1 9 The sample size must be increased by a factor of to decrease the margin of error by a factor of (Type a whole number.) What is the general relationship, if any, between the sample size and the margin of error? OA. 1 Increasing the sample size by a factor M results in the margin of error decreasing by a factor of VM 1 OB. Increasing the sample size by a factor M results in the margin of error decreasing by a factor of M OC. Increasing the sample size by a factor M results in the margin of error decreasing by a factor of M2 OD. There is no relationship between the sample size and the margin of error. 1

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 0.02 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 CR (a) na (Round up to the nearest integer.) Х (b) = (Round up to the nearest integer.) Table of critical values Area in Each Tail 2 Critical Value, Level of Confidence, (1 - a). 100% 90% 95% 0.05 1.645 1.96 0.025 0.005 99% 2.575 Print Done

8 The accompanying data represent the total travel tax (in dollars) for a 3-day business trip in 8 randomly selected cities. A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot indicates there are no outliers. Complete parts (a) through (C) below. 68.69 79.31 68.62 83.29 79.73 86.19 101.41 98.49 Click the icon to view the table of critical t-values. (a) Determine a point estimate for the population mean travel tax. A point estimate for the population mean travel tax is $ (Round to two decimal places as needed.) (b) Construct and interpret a 95% confidence interval for the mean tax paid for a three-day business trip Select the correct choice below and fill in the answer boxes to complete your choice. (Round to two decimal places as needed.) O A. One can be % confident that the mean travel tax for all cities between $and $ OB. The travel tax is between S and $ for % of all cities OC. There is a % probability that the mean travel tax for all cities is between $ and $ OD. One can be % confident that the all cities have a travel tax between $and $ (c) What would you recommend to a researcher who wants to increase the precision the interval, but does not have access to additional data? O A. The researcher could decrease the level of confidence. O B. The researcher could decrease the sample standard deviation. OC. The researcher could increase the level of confidence. OD. The researcher could increase the sample mean.