A sample of 20 items provides a sample standard deviation of 4. **TABLE 11.1: Selected Values from the Chi-Square Distribution Table**This table provides selected values from the Chi-Square Distribution for various degrees of freedom and areas in the upper tail. The Chi-Square distribution is commonly used in statistical tests to assess the variance of a sample. **Graph Explanation:**- The graph at the top illustrates the Chi-Square distribution curve with the area in the upper tail highlighted. The horizontal axis is marked with $\chi^2_\alpha$, representing the critical value for the specified area or probability.**Table Details:**- **Degrees of Freedom:** Listed in the first column, ranging from 1 to 100.- **Area in Upper Tail:** This section corresponds to $ \alpha $ levels of 0.99, 0.975, 0.95, 0.90, 0.10, 0.05, 0.025, and 0.01.Each cell in the table represents the Chi-Square value for a specific degrees of freedom and tail area. **Sample Entries:**- For 1 degree of freedom and an area of 0.05, the Chi-square value is 3.841.- For 10 degrees of freedom and an area of 0.01, the Chi-square value is 19.675.- For 40 degrees of freedom and an area of 0.05, the Chi-square value is 55.758.*Note: A more extensive table is provided as Table 3 of Appendix B (available online). This provides additional Chi-Square values for further degrees of freedom and tail areas.* This table is a valuable tool for statistical tests, allowing users to find critical values needed for hypothesis testing. A sample of 20 items provides a sample standard deviation of 4.a. Compute the 90% confidence interval estimate of the population variance (to 2 decimals). Use Table 11.1.[_____] ≤ σ² ≤ [_____]b. Compute the 95% confidence interval estimate of the population variance (to 2 decimals). Use Table 11.1.[_____] ≤ σ² ≤ [_____]c. Compute the 95% confidence interval estimate of the population standard deviation (to 1 decimal). Use Table 11.1.[_____] ≤ σ ≤ [_____](Note: There are no graphs or diagrams in the image.)

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Answered: A sample of 20 items provides a sample…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A standardized test for graduate school admission has a mean score of 147 with a standard deviation of 11 and a unimodal, symmetric distribution of scores. A test preparation organization teaches small classes of 4 students at a time. A larger organization teaches classes of 49 at a time. Both organizations publish the mean scores of all their classes. A mean score of 158 is ______ SD above the mean for the smaller organization, and _______ SD above the mean for the larger organization. Both organizations advertise that if any class has an average score below 139, they'll pay for everyone to retake the test. Which organization is at greater risk to have to pay? A mean score of 139 is ______ SD below the mean for the smaller organization, and ______ SD below the mean for the larger organization.
Allegiant Airlines charges a mean base fare of $89. In addition, the airline charges for making a reservation on its website, checking bags, and inflight beverages. These additional charges average $39 per passenger.† Suppose a random sample of 58 passengers is taken to determine the total cost of their flight on Allegiant Airlines. The population standard deviation of total flight cost is known to be $40. (a) What is the population mean cost per flight in dollars? $ (b) What is the probability the sample mean will be within $10 of the population mean cost per flight? (Round your answer to four decimal places.) (c) What is the probability the sample mean will be within $5 of the population mean cost per flight? (Round your answer to four decimal places.)
Online customer service is a key element to successful online retailing. According to a marketing survey, 30% of online customers take advantage of the online customer service. Assume the population proportion of those who use online customer service is 0.30. Random samples of 100 customers are selected. What is the standard deviation of the sampling distribution of the proportion?
five samples of 15 minerals are taken from a population. The sample means for hardness of the minerals are 6.5, seven, seven, 6.5, and six. The standard deviation for the mineral is .745. Find the meaning of the sample means and the standard deviation of the sample means for the hardness
A sample consists of the following N scores 1,9,8,5,7 calculate the standard deviation
You have have sampled five production lines operating and you wish to estimate the sample standard deviation of the five lines. Given the data below, provide your estimate of the sample standard deviation to the first decimal point, that is, 0.9 instead of 1. Month Production Line 1 51 Line 2 145 Line 3 70 Line 4 119 Line 5 92
Find the range, variance, and standard deviation for the given sample data, if possible. If the measures of variation can be obtained for these values, do the results make sense? Biologists conducted experiments to detemine whether a deficiency of carbon dioxide in the soil affects the phenotypes of peas. Listed below are the phenotype codes, where 1=smooth-yellow, 2=smooth-green, 3=wrinkled yellow, and 4=wrinkled-green. 2 2 2 2 4 2 3 2 2 2 2 2 1 2 2 3 1 2 2 2 ..... Can the range of the sample data be obtained for these values? Choose the correct answer below and, if necessary, fill in the answer box within your choice. O A. The range of the sample data is (Type an integer or a decimal. Do not round.) B. The range of the sample data cannot be calculated.
A developmental psychologist is interested in studying how long babies gaze at a photograph of a human face. To test this question, she shows a picture to a sample of six babies and records the length of their gaze in seconds. The data are as follows: 12, 17, 18, 20, 20, 29. Calculate the mean, median, mode, range, variance and standard deviation for the sample.
A study reported that finger rings increase the growth of bacteria on health-care workers’ hands. Research suggests that 31 percent of health-care workers who wear rings have bacteria on one or both hands. Suppose that independent random samples of 100 health-care workers wearing rings is selected. What is the standard deviation of the sampling distribution of the sample proportions of health-care workers having bacteria on one or both hands? A. 100 B. 0.0462 C. 0.69
A. What is the standard deviation of this population? (2, 3, 6, 8, 11) B. What is the standard deviation of this sample? (3, 4, 5, 7, 8, 8, 9, 12)
A random sample of 120 cars in the drive-thru of a popular fast food restaurant revealed that the mean bill of $29.27 per car. The population standard deviation is $6.17. Find the mean bill for all cars from the drive-thru with 82% confidence.
A report stated that after obtaining a bachelor's degree, 43% of college students enroll in a graduate degree program. For a random sample of 61 undergraduate students, find the mean, variance and standard deviation for the number of students who will enroll in a graduate degree program after obtaining a bachelor's degree. a.) mean b.) variance c.) standard deviation (round to two decimal places)

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