Assume that all​ grade-point averages are to be standardized on a scale between 0 and 5. How many​ grade-point averages must be obtained so that the sample mean is within 0.007 of the population​ mean? Assume that a 95​% confidence level is desired. If using the range rule of​ thumb, σcan be estimated as range 4            =  5−04 =1.25.                       4 Does the sample size seem​ practical?   The required sample size is nothing. ​(Round up to the nearest whole number as​ needed.) Does the sample size seem​ practical?     A. ​Yes, because the required sample size is a fairly large number.   B. ​No, because the required sample size is a fairly small number.   C. ​Yes, because the required sample size is a fairly small number.   D. ​No, because the required sample size is a fairly large number.

Consider the following measures based on independently drawn samples from normally distributed populations: (You may find it useful to reference the appropriate table: chi-square table or F table) Sample 1: s = 241, and n1 = 26 Sample 2: s = 220, and n2 = 16 a. Construct the 95% interval estimate for the ratio of the population variances. (Round "F" value and final answers to 2 decimal places.) Confidence interval to b. Using the confidence interval from Part (a), test if the ratio of the population variances differs from 1 at the 5% significance level. The 95% confidence interval the value 1. Thus, we conclude that the population variances differ at the 5% significance level.

1.a.Given the sample results taken from a normal population distribution: mean = 4.65, ? = 0.40, and n = 11.For a 99% confidence interval, find the margin-of-error for the population mean. (use 2 decimal places) b.Find the lower limit of a confidence interval if the mean is twenty-one percent, and the margin-of-error is 0.036.(Express answer as decimal number to 3 places.) lower limit =

Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many grade-point averages must be obtained so that the sample mean range 4-0 is within 0.014 of the population mean? Assume that a 95% confidence level desired. If using the range rule of thumb, o can be estimated as Does the sample size seem practical? The required sample size is. (Round up to the nearest whole number as needed.) Does the sample size seem practical? O A. Yes, because the required sample size is a fairly large number. O B. Yes, because the required sample size is a fairly small number. O C. No, because the required sample size is a fairly large number. O D. No, because the required sample size is a fairly small number. = π = 1.

Assume that a sample is used to estimate a population proportion p. Find the margin of error M.E. that corresponds to a sample of size 319 with 20.1% successes at a confidence level of 90%. M.E.= 96 Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places. Round final answer to one decimal place

Assume that all grade-point averages are to be standardized on a scale between 0 and 4. How many grade-point averages must be obtained so that the sample mean is within 0.008 of the population mean? Assume that a 98% confidence level is desired. If using the range 4-0 =1. Does the sample size seem practical? range rule of thumb, o can be estimated as 4 The required sample size is (Round up to the nearest whole number as needed.) Does the sample size seem practical? O A. No, because the required sample size is a fairly large number. O B. No, because the required sample size is a fairly small number. OC. Yes, because the required sample size is a fairly small number. O D. Yes, because the required sample size is a fairly large number.

You want to estimate the mean weight of quarters in circulation. A sample of 50 quarters has a mean weight of 5.658 grams and a standard deviation of 0.064 gram. Use a single value to estimate the mean weight of all quarters. Also, find the 95% confidence interval for the average weight of all quarters. grams. The estimate for the mean weight of all quarters is (Round to three decimal places as needed.) Find the 95% confidence interval for the mean weight of all quarters. grams<μ< grams (Round to three decimal places as needed.)

Assume that all grade-point averages are to be standardized on a scale between 0 and 6. How many grade-point averages must be obtained so that the sample mean is within 0.014 of the population mean? Assume that a 99% range 6 -0 confidence level is desired. If using the range rule of thumb, o can be estimated as = 1.5. Does the 4 %3D 4 sample size seem practical? The required sample size is. (Round up to the nearest whole number as needed.)

Assume that all​ grade-point averages are to be standardized on a scale between 0 and 6. How many​ grade-point averages must be obtained so that the sample mean is within 0.011 of the population​ mean? Assume that a 95​% confidence level is desired. If using the range rule of​ thumb, σ can be estimated as range/4=6−0/4=1.5. Does the sample size seem​ practical? The required sample size is ___ Does the sample size seem​ practical?

Assume that all grade-point averages are to be standardized on a scale between 0 and 6. How many grade-point averages must be obtained so that the sample mean 6-0 = = 1.5. 4 range is within 0.009 of the population mean? Assume that a 99% confidence level is desired. If using the range rule of thumb, o can be estimated as 4 Does the sample size seem practical? The required sample size is . (Round up to the nearest whole number as needed.) Does the sample size seem practical? O A. No, because the required sample size is a fairly large number. O B. Yes, because the required sample size is a fairly small number. O C. Yes, because the required sample size is a fairly large number. O D. No, because the required sample size is a fairly small number.