For a normally distributed variable measured at the interval/ratio level, a 95% confidence level is associated...
For a normally distributed variable measured at the interval/ratio level, a 95% confidence level is associated with how many standard deviation units? select one A. depends on the sample size B. depends on the test statistic C.1.96 D. 2.58
If a power analysis indicated that for a given sample size the power was.50, which would be true? select one: A. The risk of a type I error would be a 50% B. The results would be statistically significant 50% of the time C. The risk of a type II error would be 50% D. The 95% CI would have a range of 50 points.
Homework Answers
For a normally distributed variable measured at interval/ratio level, a 95% confidence level is associated with how many standard deviation units - 1.96
If a power analysis indicated that for a given sample size the power was.50,which would be true ,the correct answer is B. The results would be statistically significant 50% .
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For a normally distributed variable measured at the
interval/ratio level, a 95% confidence level is associated...
A 50% confidence level has a confidence interval of 0.6745. A 90% confidence level has a...
A 50% confidence level has a confidence interval of 0.6745. A 90% confidence level has a confidence interval of 1.96. A 99% confidence level has a confidence interval of 2.57. A critical distance is measured 17 times. The mean is 317.6 feet, the sample standard deviation is 0.46 feet. The standard error of the mean value with a confidence level of 90% is (A) (2.57) (0.46) 17 (B) (1.96) (0.46) 17 D. (1.96) (0.46) V17 (D) (0.46) (17) 1.96
Scores on a Statistics Final Exam are normally distributed. Using a 95% confidence level, find the...
Scores on a Statistics Final Exam are normally distributed. Using a 95% confidence level, find the sample size necessary to predict the population mean within 3 points. Assume the population standard deviation is 8 points.
Assuming that the population is normally distributed, construct a 95 % confidence interval for the population...
Assuming that the population is normally distributed, construct a 95 % confidence interval for the population mean, based on the following sample size of n=8. 1, 2, 3, 4, 5, 6, 7 , and 19 In the given data, replace the value 19 with 8 and recalculate the confidence interval. Using these results, describe the effect of an outlier (that is, an extreme value) on the confidence interval, in general. Find a 95% confidence interval for the population mean, using...
simple random sample of size n is drawn from a population that is normally distributed. The...
simple random sample of size n is drawn from a population that is normally distributed. The sample mean, X. is found to be 111, and the sample standard deviation is found to be 10. a) Construct a 95% confidence interval about if the sample size, n, is 28. b) Construct a 95% confidence interval about if the sample size, n, is 11 c) Construct a 90% confidence interval about if the sample size, n, is 28 ) Could we have...
1. A random sample of size n is drawn from a population that is normally distributed...
1. A random sample of size n is drawn from a population that is normally distributed with a standard deviation of 8. The sample mean is found to be 50. 1.a) Construct a 98% confidence interval (CI) for the population mean uif the sample size is 16. The critical value used is The (margin of) error for the 98% confidence interval (C.I.) is The resulting Cl is 1.b) Construct a 95% confidence interval for the population mean u if the...
True or False? The higher the confidence level, the narrower is the confidence interval for the...
True or False? The higher the confidence level, the narrower is the confidence interval for the mean. Select an answer The most efficient point estimator for the population mean ù is the sample median . Select an answer • To reduce the width of a confidence interval, we can increase the sample size n. Select an answer • As long as the population is normal with variance o’, the statistic (n-1) S2 has a Chi-squared 02 distribution with n degrees...
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard...
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard deviation σ-10. (a) what would be the margin of error of a 95% confidence interval for the population mean based on a random sample size of 25? The multiplier for a z confidence interval with a 95% confidence level is the critical value z. 1.960. (Enter your answer rounded to three decimal places.) margin of error 25 (b) What would be the margin of...
A 95% confidence interval for a sample data from a normally distributed data is (24.9 ,...
A 95% confidence interval for a sample data from a normally distributed data is (24.9 , 31.5). What is the sample mean of the data?
1 a) Approximately 95% of all values of a normally distributed populations lie within how many...
1 a) Approximately 95% of all values of a normally distributed populations lie within how many standard deviations of the population mean b) A random sample of ten items is taken from a population. The items have the following values: 9 32 37 32 21 24 10 15 21 30. Find the point estimate for the confidence interval c) State what effect on the margin of error for a confidence interval each of the following will have. i) Increase sample...
Assuming that the population is normally distributed, construct a 95% confidence interval for the population mean,...
Assuming that the population is normally distributed, construct a 95% confidence interval for the population mean, based on the following sample size of .n=7. 1, 2, 3, 4, 5, 6, and 15 <-----this is the data In the given data, replace the value 15 with 7 and recalculate the confidence interval. Using these results, describe the effect of an outlier (that is, an extreme value) on the confidence interval, in general. Find a 95% confidence interval for the population mean,...
A 50% confidence level has a confidence interval of 0.6745. A 90% confidence level has a confidence interval of 1.96. A 99% confidence level has a confidence interval of 2.57. A critical distance is measured 17 times. The mean is 317.6 feet, the sample standard deviation is 0.46 feet. The standard error of the mean value with a confidence level of 90% is (A) (2.57) (0.46) 17 (B) (1.96) (0.46) 17 D. (1.96) (0.46) V17 (D) (0.46) (17) 1.96
simple random sample of size n is drawn from a population that is normally distributed. The sample mean, X. is found to be 111, and the sample standard deviation is found to be 10. a) Construct a 95% confidence interval about if the sample size, n, is 28. b) Construct a 95% confidence interval about if the sample size, n, is 11 c) Construct a 90% confidence interval about if the sample size, n, is 28 ) Could we have...
1. A random sample of size n is drawn from a population that is normally distributed with a standard deviation of 8. The sample mean is found to be 50. 1.a) Construct a 98% confidence interval (CI) for the population mean uif the sample size is 16. The critical value used is The (margin of) error for the 98% confidence interval (C.I.) is The resulting Cl is 1.b) Construct a 95% confidence interval for the population mean u if the...
True or False? The higher the confidence level, the narrower is the confidence interval for the mean. Select an answer The most efficient point estimator for the population mean ù is the sample median . Select an answer • To reduce the width of a confidence interval, we can increase the sample size n. Select an answer • As long as the population is normal with variance o’, the statistic (n-1) S2 has a Chi-squared 02 distribution with n degrees...
25> Consider a variable known to be Normally distributed with unknown mean μ and known standard deviation σ-10. (a) what would be the margin of error of a 95% confidence interval for the population mean based on a random sample size of 25? The multiplier for a z confidence interval with a 95% confidence level is the critical value z. 1.960. (Enter your answer rounded to three decimal places.) margin of error 25 (b) What would be the margin of...
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