Finding Confidence Intervals. In Exercises 9–16, assume that each sample is a simple random sample obtained from a population with a
15. Highway Speeds Listed below are speeds (mi/h) measured from southbound traffic on I-280 near Cupertino, California (based on data from SigAlert). This simple random sample was obtained at 3:30 PM on a weekday. Use the sample data to construct a 95% confidence
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- Point ENTRY CARD Compute the variance of this frequency distribution. Score Number of Students 3. 8 10 4 12 15 Follow the steps given below. Complete the tables shown for each step. Steps 1. Compute the mean by using the Solution Number of formula X=EX Score %3D Students fX 3 8. 10 4 12 15 3 n= 20arrow_forwardConstructing Frequency Distributions. In Exercises Il-18, use the indicated data to construct the frequency distribution. (The data for Exercises 13–16 can be downloaded at TriolaStats.com.) 11. Old Faithful Listed below are sorted duration times (seconds) of eruptions of the Old Faithful geyser in Yellowstone National Park. Use these times to construct a frequency distribu- tion. Use a class width of 25 seconds and begin with a lower class limit of 125 seconds. 125-203 205 221 225-229 233 233 235 236 236 237 238 238 239 240 240 240240 241241 242 242 242 243 243 244 245 245 245 245 246 246 248 248 248 249 249 250 251 252 253 253 255 255 256 2S7 258 262 264 12. Tornadoes Listed below are the F-scale intensities of recent tornadoes in the United States. Construct a frequency distribution. Do the intensities appear to have a normal distribution? 0 4 0 0 111 00 0 1 2 0 11 010 F Ill0 0111 10 010 0 1 0 0 1I1 30 0 0 0 0 3 000 2 0 13. Burger King Lunch Service Times Refer to Data Set 25 "Fast…arrow_forwardstatistics practitioner took a random sample of 48 observations from a population whose standard deviation is 23 and computed the sample mean to be 100. Note: For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 95% confidence, changing the population standard deviation to 47; Confidence Interval = C. Estimate the population mean with 95% confidence, changing the population standard deviation to 10; Confidence Interval =arrow_forward
- A sample of 250 employees of a company is selected, and the average age is found to be 35 years. This value is a statistic or parameter.arrow_forwardSUBJECT: STATISTICS AND PROBABILITYDirections: Illustrate the rejection region given the critical value and identify if the t-values lie in the non-rejection region or rejection region. !!! Graph the critical and computed value. !!!arrow_forwardA statistics practitioner took a random sample of 60 observations from a population whose standard deviation is 31 and computed the sample mean to be 106. For each confidence interval, enter your answer in the form (LCL, UCL). You must include the parentheses and the comma between the confidence limits. A. Estimate the population mean with 95% confidence. Confidence Interval = B. Estimate the population mean with 90% confidence. Confidence Interval = C. Estimate the population mean with 99% confidence. Confidence Interval =arrow_forward
- which in the picture is an estimator for the population mean µ?arrow_forwardSolve with clear solutionarrow_forwardhe table below shows the scores of a group of students on a 10-point quiz. Test Score Frequency 3 3 4 2 5 2 6 1 7 2 8 4 9 1 10 1 The mean score on this test is: The median score on this test is:arrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw HillBig Ideas Math A Bridge To Success Algebra 1: Stu...AlgebraISBN:9781680331141Author:HOUGHTON MIFFLIN HARCOURTPublisher:Houghton Mifflin Harcourt