suppose that from a sample size of 16, a 95% confidence interval of (12,18) for the mean has been obtained determine x and s respectivly
suppose that from a sample size of 16, a 95% confidence interval of (12,18) for the...
Suppose we are making a 95% confidence interval for the population mean from a sample of size 15. What number of degrees of freedom should we use? Choose the correct answer below. A. 15 B. 16 C. 14 D. There is not enough information given to find out.
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...
A 95% confidence interval for a population mean goes from 10 to 13. The interval was based on a sample size of 45. The interval was calculated using a known population standard deviation but the value has been lost. What is the population standard deviation?
Form a 95% confidence interval on the difference in the means. sample A B sample size 10 10 sample mean 65.5 50.5 sample std dev 9 9
Suppose you wish to estimate the mean of a normal population using a 95% confidence interval, and you know from prior information that σ2 ≈ 1. a. To see the effect of the sample size on the width of the confidence interval, calculate the width of the confidence interval for n = 16, 25, 49, 100, and 400. b. Plot the width as a function of sample size n on graph paper. Connect the points by a smooth curve and...
A 95% confidence interval obtained from a sample of 100 outpatients for the true population mean normal mean systolic blood pressure is given by (114 mmHG, 120 mmHG). A) Find 99% Confidence Interval B) Can you tell how much would it be wider compare to 95% Confidence Interval? Mention all the steps for the both answers.
calculate the 95% confidence interval using the appropriate formula for this sample size. Remember to add and subtract the margin of error from the sample mean to calculate the lower and upper bounds of the confidence interval. Please provide excel formula you plan to enrol n the new online 1Mean 6096 4996 Standard Deviatio 0 Lower Bound 1Upper Bound 10 Yes 11 Yes 12 13 Yes 14 15 16 Yes 17 18 es 19 21 Yes 23 Yes 24 Yes
Confidence Intervals 9. Construct a 95 % confidence interval for the population mean, . In a random sample of 32 computers, the mean repair cost was $143 with a sample standard deviation of $35 (Section 6.2) Margin of error, E. <με. Confidence Interval: O Suppose you did some research on repair costs for computers and found that the population standard deviation, a,- $35. Use the normal distribution to construct a 95% confidence interval the population mean, u. Compare the results....
a simple random sample of size n = 16 is drawn from a population that is normally distributed. The sample mean is found to be x = 50 and the standard deviation is found to be s = 11. Construct a 95% confidence interval about the populatio nmean
A 95% confidence interval of 19.8 months to 47.4 months has been found for the mean duration of imprisonment, u, of political prisoners of a certain country with chronic PTSD. a. Determine the margin of error, E. b. Explain the meaning of E in this context in terms of the accuracy of the estimate. c. Find the sample size required to have a margin of error of 12 months and a 99% confidence level. (use standard deviation=38 months.) d) Find...