calculate a 96 percent confidence interval for a situation where we know mean is 50 standard deviation is 5 and number of sample points is 81
calculate a 96 percent confidence interval for a situation where we know mean is 50 standard...
Suppose we are interested to construct a 95% confidence interval of the mean exam score. A random sample of 36 scores is taken and gives a sample mean (sample mean score) of 68. EBM will be the largest O a when the population standard deviation is 12 points, when the population standard deviation is 18 points. OC when the population standard deviation is 15 points when the population standard deviation is 20 points Od b. Suppose we are interested to...
1. construct a 95% confidence interval where standard deviation is 15 and mean is 99.133 2. construct a 95% confidence interval where standard deviation is 15 and mean is 99 3. construct a 95% confidence interval where standard deviation is 15 and mean is 98.625 i want to add that the population mean is 100 question 1- sample size is 8 question 2- sample size is 20 question 3- sample size is 30
Calculate a 90% confidence interval if the sample mean is 80, the sample standard deviation is 12, and the number of observations is 45
A random sample of size 36 is taken from a population with mean 50 and standard deviation 5. Find P( x¯x¯ < 51.5). The weight of a product is measured in pounds. A sample of 50 units is taken from a recent production. The sample yielded X¯¯¯X¯ = 75 lb, and we know that σ2 = 100 lb. Calculate a 99 percent confidence interval for μ.
A study of 27 female Sumatran elephants provided a 96% confidence t-interval for the mean shoulder height of all female Sumatran elephants as (197.2, 235.4) cm. (a) The margin of error is m = 19.1 cm (b) The critical value t* found from Table C to calculate this confidence interval is t* = 2.126 X (Round to 3 decimal places.) (c) The standard error of the sample mean is SE(X) = 3.68 x cm (Round to 2 decimal places.) (d)...
10. Fill in the blank. In developing a 96% confidence interval estimate for some normal population mean μ, the population standard deviation σ was 10, The interval estimate was found to be 12.6 ±3.64. Had σ equaled 5, the interval estimate would be 12. Based on a sample of size n 21 drawn from a normal population, the sample mean and sample standard deviation are, respectively, 15.68 and 1.36. We use T-test to test Ho : μ 15 vs H1...
The mean and the standard deviation of the sample of 100 bank customer waiting times are x¯x¯ = 5.14 and s = 2.321. Calculate a t-based 95 percent confidence interval for µ, the mean of all possible bank customer waiting times using the new system. Are we 95 percent confident that µ is less than 6 minutes?. Assume normality. (Choose the nearest degree of freedom for the given sample size. Round your answers to 3 decimal places.) The t-based 95 percent confidence interval is [, ]. (Click to select)YesNo , interval is (Click to select)lessmore than...
A researcher is interested in finding a 95% confidence interval for the mean number minutes students are concentrating on their professor during a one hour statistics lecture. The study included 96 students who averaged 37.1 minutes concentrating on their professor during the hour lecture. The standard deviation was 13.6 minutes. Round answers to 3 decimal places where possible. a. To compute the confidence interval use a distribution. b. With 95% confidence the population mean minutes of concentration is between and...
statistics itl 5 LTE Confidence Interval for the P... DOCX -16 KB Close Confidence Interval for the Population Mean l. Determine the critical values for 80%, 90%, 95%, and 99%; 2. Construct 80%, 90%, 95%, and 99% confidence interval for the population mean given that the standard deviation of the population is 900 and the sample mean is 425 and the sample consist of 100 points of data 3. Find the T interval for the following: Construct 80% 90%. 95%,...
QUESTION 21 If we change a 90% confidence interval estimate to a 99% confidence interval estimate while holding sample size constant, we can expect a. the width of the confidence interval to increase. b. the width of the confidence interval to decrease. c. the width of the confidence interval to remain the same. d. the sample size to increase. QUESTION 22 Which one of the following is a correct statement about the probability distribution of a t random variable? a....