You want to estimate the sample standard deviation so you can get an idea of how large of a sample you need. The topic of your research is "number of hours of exercise per week for adults". You estimate a reasonably high number of 14 and a low number of 4. What is the estimate for the standard deviation? Give your answer to two decimal places. S =

You want to estimate the sample standard deviation so you can get an idea of how large of a sample you need. The topic of your research is "number of hours of exercise per week for adults". You estimate a reasonably high number of 14 and a low number of 4. What is the estimate for the standard deviation? Give your answer to two decimal places. S =

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

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Tally is interested in the fuel efficiency of her car. She computes how many miles per gallon her car got each week for the last four weeks. The data are shown below. Miles per Gallon 28 36 56 64 She computes that the mean of the data set is 4646, but also wants to know the range and standard deviation. Find the range of this data set. miles per gallon Find the standard deviation of this data set. miles per gallon
A statistics professor surveys all 100 of the students in an introductory statistics lecture. The survey asks the students to estimate when they typically wake up on weekdays. The data are recorded in terms of the number of hours after midnight the students wake up. Would it be more appropriate to find a sample standard deviation or population standard deviation in this situation? Select the correct answer below: A. Sample standard deviation B. Population standard deviation
You will need a z table and ONE of the z score formulas for this question. Pretend there is pre-employment test with normally distributed scores and a mean =50 and standard deviation =10. What score will land you in the top 10%? A. 62.85 B. 52.65 C. 52 D. 55.85
d. Determine the sample standard deviation. Round your answer to 2 decimal places. e. Determine the coefficient of variation.
We have provided simple data sets for you to practice the basics of finding measures of variation. For each data set, determine the a. range. b. sample standard deviation. 3, 5, 7
The table on the right gives the annual income for eight families, in thousands of dollars. Find the number of standard deviations family E's income is from the mean. Family A B C D E F G H Income 46 50 46 47 48 47 44 48 Question content area bottom Part 1 How many standard deviations is family E's income from the mean? enter your response here (Round to three decimal places as needed.)
The frequency distribution was obtained using a class width of 0.5 for data on cigarette tax rates. Use the frequency distribution to approximate the population mean and population standard deviation. Compare these results to the actual mean u = $1.727 and standard deviation o = S1.041. E Click the icon to view the frequency distribution for the tax rates. Frequency distribution of cigarette tax rates The population mean is $ Tax Rate 0.00-0.49 0.50-0.99 1.00-1,49 1.50-1.99 2.00-2.49 2.50-2.99 3.00-3.49 3.50-3.99 Frequency D (Round to three decimal places as needed.) 5 15 The population standard deviation is S (Round to three decimal places as needed.) Compare these results to the values found using the actual data. O A. The grouped mean is slightly larger, while the grouped standard deviation is slightly smaller. O B. The grouped values are both slightly larger. O C. The grouped values are both slightly smaller. O D. The grouped mean is slightly smaller, while the grouped standard…
Someone tells you that the mean score on a test was 85, and the standard deviation was -10. What does this mean? A. Need more information to answer this question B. The most common score was 75. C. A majority of the class scored less than 85. D. This is not possible. Standard deviation cannot be negative.
The amount of caffeine in a sample of five-ounce servings of brewed coffee is shown in the histogram. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Click the icon to view the histogram. Complete the table. Round values to the nearest tenth as needed. Graph/chart f Midpoint x xf 70.5 Ay 30- 92.5 26 25- 114.5 136.5 20- 158.5 15- 12 Ef = Exf = 10- Find the mean of the data set. 5- X = (Round to the nearest tenth as needed.) 48.5 70.5 92.5 114.5 136.5 158.5 Complete the table. Round values to the nearest tenth as needed. Midpoint x (x-x)? (x-x)?f X-X 70.5 Print Done 92.5 114.5 136.5 158.5 (x-x)?r= ] of
The state and will spend 15 hours average a week and class and the standard deviation is 2 hours what percentage of students spend less than 12 hours in class
homework #19
The coefficient of variation CV describes the standard deviation as a percent of the mean. Because it has no units, you can use the coefficient of variation to compare data with different units. Find the coefficient of variation for each sample data set. What can you conclude? Standard deviation CV = • 100% Mean E Click the icon to view the data sets. Data Table ..... CVneights = 71.2% (Round to the nearest tenth as needed.) Heights Weights 68 181 77 169 72 167 72 207 71 177 70 175 78 185 69 186 67 221 70 216 67 209 73 206