2. The following data are drawn from a normal distribution. data = c(101, 114, 104, 98,...
(21) A sample of size 20 is drawn from a normal distribution with unknown variance and mean. The sample variance s2 = 0.012. Find a 95% two-sided confidence interval for the standard deviation o of the population. A. [0.0833,0.1600] B. (0.010,0.0130] C. (0.0069,0.0256] D. None of the above
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 These 31 girls are an SRS of all seventh-grade girls in the school district. Suppose that the standard deviation of IQ scores in this population is known to be σ = 15. We expect...
5.6.1. A random sample of size 20 is drawn from a population having a normal distribution. The sample mean and the sample standard deviation from the data are given, respectively, as 2.2 and s-1.42. Construct a 90% confidence interval for the population variance σ2 and interpret.
We have a random sample of size 17 from the normal distribution N(u,02) where u and o2 are unknown. The sample mean and variance are x = 4.7 and s2 = 5.76 (a) Compute an exact 95% confidence interval for the population mean u (b) Compute an approximate (i.e. using a normal approximation) 95% confidence interval for the population mean u (c) Compare your answers from part a and b. (d) Compute an exact 95% confidence interval for the population...
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 These 31 girls are an SRS of all seventh-grade girls in the school district. Suppose that the standard deviation of IQ scores in this population is known to be σ σ = 15. We...
The following values are drawn from a normal population. (You may find it useful to reference the appropriate table: chi-square table or table) 35 22 22 30 1930 1919 Click here for the Excel Data File a. Calculate the point estimates for the population variance and the population standard deviation (Round your answers to 4 decimal places.) Point Estimates Population variance Population standard deviation b. Construct the 95% confidence interval for the population variance and the population standard deviation (Round...
Use the standard normal distribution or the t-distribution to construct the indicated confidence interval for the population mean of each data set. Justify your decision. If neither distribution can be used, explain why. Interpret the results. (a) In a random sample of 36 patients, the mean waiting time at a dentist’s office was 24 minutes and the standard deviation was 7.5 minutes. Construct a 90% confidence interval for the population mean. (b) In a random sample of 25 cereal boxes,...
The following data were randomly drawn from an approximately normal population 4, 7, 10, 16, 19, 25, 30 E) Send data to Excel data, find a 95% confidence interval for the population standard deviation. Then complete the table below. intermediate computations to at least three decimal places. Round your answers to at least two decimal places. Based on these (If necessary, consult a list of formulas.) what is the lower limit of the 95% confidence interval? What is the upper...
A sample of 25 observations is taken from a normal distribution with a population variance of 9. The sample mean is 5. The 95 percent confidence interval for the population mean is from A 3.82 B 6.18 C 3.76 D 6.24
Given the following data that was sampled from a normal population distribution: 119, 119, 113, 122, 75, 94, 116, 100, 85 Determine a 95% confidence interval for the population mean. (use 1 decimal place) Lower Limit: Upper Limit: