In a study of government financial aid for college students, it becomes necessary to estimate the percentage of full-time college students who earn a bachelor's degree in four years less. Find the sample size needed to estimate that percentage. Use a 0.03 margin of error and use a confidence level of 99%. Complete parts (a) through (c) below. a. Assume that nothing is known about the percentage to be estimated. n=1843 (Round up to the nearest integer.) b. Assume prior studies have shown that about 60% of full-time students earn bachelor's degrees in four years or less. (Round up to the nearest integer.)

A population proportion is to be estimated. Estimate the minimum sample size needed to achieve a margin of error of 0.02 with a 95% degree of confidence. -- OA. 1,250 O B. 50 OC. 2,500 O D. 5,000

Solve A-C

We are collecting data on the patients that have been vaccinated for the coronavirus, and the initial data shows a 90% success. We want the margin of error to be no more than 3%. We want to be extremely  careful, so we are going to use a 99% confidence. Determine the smallest size of the sample to achieve this level of confidence.  a 560  b 680  c 664  d 600  e 686

M16-2

What sample size is needed to give a margin of error within+3% in estimating a population proportion with 90% confidence? We estimate that the population proportion is about 0.25. Round your answer up to the nearest integer. Sample size = i

The level of dissolved oxygen in a river is an important indicator of the water’s ability to support aquatic life. A research project is started to determine if the oxygen levels in the river have changed. It is known from a study done 10 years prior, that the mean oxygen levels in milligrams per liter for the river was 4.3. a- Write appropriate hypotheses for this test b- You collect water samples at 15 randomly chosen locations along the river and measure the dissolved oxygen. Here are your results in milligrams per liter: 4.53 5.5 4.01 5.04 4.83 4.66 3.29 4.4 2.87 5.23 5.42 5.73 4.13 6.38 5.55 Construct and interpret a 95% confidence interval for the mean dissolved oxygen level for this stream. c- Using the sample from part b, conduct a significance test of these results using a 5% significance level. Give complete results of the test including a p-value and an interpretation of the test results that someone not in this class could understand

You are given the smaple mean and the population m standard deviation. Use this info to construct the 90% and 95% confidence intervals for the population mean. Interpert the results and compare the widths of the confidence intervals. A random sample of 50 home theater systems has a mean price of $145. Assume the population standard deviation is $17.30

Find the indicated margin of error.In a survey of 6700 T.V. viewers, 3350 said they watch network news programs. Find the margin of error for the 99% confidence interval used to estimate the population proportion.  a 0.0120  b 0.0158  c 0.0138  d 0.00900

It is desired to estimate the proportion of cannabis users at a university. What is the sample size required to if we wish to have a 95% confidence in the interval and an error of 10%? 385 68 10 97