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You take a sample of 4 people's scores on a personality test. Their scores are 13,...
One personality test available on the World Wide Web has a subsection designed to assess the...
One personality test available on the World Wide Web has a subsection designed to assess the "honesty" of the test-taker. After taking the test and seeing your score for this subsection, you're interested in the mean score l among the general population on this subsection. The website reports that u is 145, but you believe that u is greater than 145. To do a statistical test, you choose a random sample of 100 people and have them take the personality...
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that...
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score,? on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate ?. What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 5 of ?? Use the value 22 for the population standard deviation...
Use the formula to find the standard error of the distribution of differences in sample means,...
Use the formula to find the standard error of the distribution of differences in sample means, . Samples of size 120 from Population 1 with mean 82 and standard deviation 13 and samples of size 80 from Population 2 with mean 70 and standard deviation 18 Round your answer for the standard error to two decimal places.
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that...
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score, H, on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate u. What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 3 of u? Use the value 22 for the population standard...
Suppose scores of a standardized test are normally distributed and have a known population standard deviation...
Suppose scores of a standardized test are normally distributed and have a known population standard deviation of 8 points and an unknown population mean. A random sample of 25 scores is taken and gives a sample mean of 93 points. Find the margin of error for a confidence interval for the population mean with a 98% confidence level. z0.10 z0.05 z0.025 z0.01 z0.005 1.282 1.645 1.960 2.326 2.576 You may use a calculator or the common z values above. Round...
Your sample: 13, 15, 16, 18, 51, 12, 65, 25 Now compute the appropriate t-test on...
Your sample: 13, 15, 16, 18, 51, 12, 65, 25 Now compute the appropriate t-test on the data from the previous problem, with the assumption that you only have population information regarding the mean of 29.23 and will have to estimate the standard deviation of the population because it is unknown. Use the computational formula for estimated population standard deviation when computing the standard deviation. Show your plugged-in formula of t.
Suppose you take a sample of size 4 from a population that is normally distributed with...
Suppose you take a sample of size 4 from a population that is normally distributed with a mean of 70 and a standard deviation of 10. Based on such a sample, what is the (approximate) probability of getting a sample mean between 60 and 80? Question 3 options: 0.025 0.05 0.5 0.95 0.975 Question 4 (1 point) Suppose you take a sample of size 4 from a population that is normally distributed with a known standard deviation of 10. You...
A sample of 10 students record their scores on the final exam for their statistics class....
A sample of 10 students record their scores on the final exam for their statistics class. The mean of the sample is 81 with sample standard deviation 7 points. Analysis of the 10 sample values indicated that the population is approximately normal. We wish to find the 95% confidence interval for the population mean test scores. What is the confidence level, c? Which of the following is correct? To find the confidence interval, a z-critical value should be used because...
The following sample of n = 4 scores was obtained from a population with unknown parameters....
The following sample of n = 4 scores was obtained from a population with unknown parameters. Scores: 2, 2, 6, 2 Compute the sample mean and standard deviation. Note: These are descriptive values that summarize the sample data. (Round your answers to two decimal places.) M = S = Compute the estimated standard error for M. (Note: This is an inferential value that describes how accurately the sample mean represents the unknown population mean.) SM =
a. The SAT is the most widely used test in the undergraduate admissions process. Scores on...
a. The SAT is the most widely used test in the undergraduate admissions process. Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800. A researcher from the admissions department at the University of New Hampshire is interested in estimating the mean math SAT scores of the incoming class with 95% confidence. How large a sample should she take to ensure that the margin of error is below 32? Round...
One personality test available on the World Wide Web has a subsection designed to assess the "honesty" of the test-taker. After taking the test and seeing your score for this subsection, you're interested in the mean score l among the general population on this subsection. The website reports that u is 145, but you believe that u is greater than 145. To do a statistical test, you choose a random sample of 100 people and have them take the personality...
A personality test has a subsection designed to assess the "honesty" of the test-taker. Suppose that you're interested in the mean score, H, on this subsection among the general population. You decide that you'll use the mean of a random sample of scores on this subsection to estimate u. What is the minimum sample size needed in order for you to be 95% confident that your estimate is within 3 of u? Use the value 22 for the population standard...
The following sample of n = 4 scores was obtained from a population with unknown parameters. Scores: 2, 2, 6, 2 Compute the sample mean and standard deviation. Note: These are descriptive values that summarize the sample data. (Round your answers to two decimal places.) M = S = Compute the estimated standard error for M. (Note: This is an inferential value that describes how accurately the sample mean represents the unknown population mean.) SM =
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