19. 98% confidence; the sample size is 1068, of which 25% are successes. 20. 90% confidence;...
Question 18 9 pts Based on a sample of size 19, a 98% confidence interval for the mean score of all students, p. on an aptitude test is from 79.2 to 94.8. Find the margin of error Question 19 9 pts A group of 75 randomly selected students have a mean score of 25.2 on a placement test. Nationwide, the standard deviation of all students taking the test is 27. This sample data is used to calculate a 90 percent...
95% Confidence the sample size is 1326, of which 35% Are successes Winter 2019 Fully Online Mat 150 (Intro to Statistics) Section 0503 Sherly Hernandez & 1。1 1/17/194 Homework: Chapter 7: Estimates and Sample Sizes Score: 0 of 1 pt ⓧ 7.2.191 | 7 of 20 (7 complete) ▼ HW Score: 22.5%, 4 Question Assume that a random sample is used to estimate a population rtion p. Find the margin of error E that corresponds to the given statistics and...
98% confidence the sample size is 800 of which 40% are sucess
1.Given below are the number of successes and sample size for a simple random sample from a population. x= 7, n = 50, 98% level. the 98% confidence interval is from _ to _.
Given a sample size of 14, what are the critical values for a 98% confidence level?
You collect a random sample of size n from a population and calculate a 98% confidence interval. Which of the following strategies produces a new confidence interval with a decreased margin of error? A.) Use a 99% Confidence level B.)Use a 95% confidence level C.)Decrease Sample Size D.)Use the same confidence level but compute the interval n time. Approximately 2% of these intervals will be larger. E.)Nothing can guarantee that you will obtain a larger margin of error. You can...
Assume that a sample is used to estimate a population proportion p. Find the 98% confidence interval for a sample of size 297 with 29% successes. Enter your answer as a tri-linear inequality using decimals (not percents) accurate to three decimal places. ___< p < ____ Answer should be obtained without any preliminary rounding. However, the critical value may be rounded to 3 decimal places.
Consider a 90% confidence interval for µ not known. For which sample size, n = 10 or n = 20, is the confidence interval longer? Critical Thinking Lorraine computed a confidence interval for µ based on a sample of size 41. Since she did not know α, she used s in her calculations. Lorraine used the normal distribution for the confidence interval instead of a Student's t distribution. Was her interval longer or shorter than one obtained by using an...
What is the t-value for a 90% confidence interval for the mean if the sample size is 24? a. 1.984 b. 1.714 c. 2.069 d. 1.96 e. 2.306 In general, when choosing the sample size for estimating a mean, which of the following will result in a smaller margin of error (E)? a. a larger confidence level b. a smaller sample size c. a dozen glazed donuts d. a larger sample size e. a more expensive calculator
Assume that a sample is used to estimate a population proportion p. Find the 90% confidence interval for a sample of size 279 with 38% successes. Enter your answer as an open - interval (i.e., parenthesis) using decimals (not percents) accurate to three decimal places. Confidence Interval = ______________.