Actual lengths of stay at a hospital's emergency department in 2009 are shown in the following table (rounded to the nearest hour).Length of stay is the total of wait and service times. Some longer stays are also approximated as 15 hours in this table.Hours Count Percent1132.69428.6838016.53410120.8758517.5666713.847347.028193.939132.6910183.7215122.48Calculate the mean andiance for the random variable (length of stay). Round your answers to two decimal places (e.g. 98.76).Mean = iVariance =2

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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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Please help with B and C
Ch Older people often have a hard time finding work. AARP reported on the number of weeks it takes a worker aged 55 plus to find a job. The data on number of weeks spent searching for a job contained in the table below. 11 47 20 15 43 17 16 31 6. 34 6. 23 22 12 20 16 28 26 20 49 23 15 26 11 14 15 16 22 22 40 27 14 16 17 26 36 14 a. Provide a point estimate of the population mean number of weeks it takes a worker aged 55 plus to find a job. Round your answer to two decimal places. weeks b. At 96% confidence, what is the margin of error? Round your answer to four decimal places. c. What is the 95% confidence interval estimate of the mean? Round your answers to two decimal places. d. Find the skewness. Round your answver to four decimal places. Discuss the degree of skewness found in the sample data. What suggestion would you make for a repeat of this study? Considering a slightly larger sample next time Select your answer- a good strategy. Check My Wo.
The "Freshman 15" refers to the belief that college students gain 15 lb (or 6.8 kg) during their freshman year. Listed in the accompanying table are weights (kg) of randomly selected male college freshmen. The weights were measured in September and later in April. Use the listed paired sample data, and assume that the samples are simple random samples and that the differences have a distribution that is approximately normal. Complete parts (a) through (c). September 68 56 54 65 57 65 93 71 67 April 68 57 56 68 61 71 88 69 67 a. Use a 0.01 significance level to test the claim that for the population of freshman male college students, the weights in September are less than the weights in the following April. In this example, Hd is the mean value of the differences d for the population of all pairs of data, where each individual difference d is defined as the April weight minus the September weight. What are the null and alternative hypotheses for the hypothesis test? Ho Hd 0 kg H₁ Hd > 0…
The durations (minutes) of 26 electric power outages in the community of Sonando Heights overthe past five years are shown below. (a) Find the mean, median, and mode. (b) Are the mean andmedian about the same? (c) Is the mode a good measure of center for this data set? Explain. (d) Isthe distribution skewed? Explain. 32 44 25 66 27 12 62 9 51 4 17 50 3599 30 21 12 53 25 2 18 24 84 30 17 17
Researchers want to know if a tutoring program affects students’ ACT scores. They used a sample of twenty students and tested them before and after the tutoring program. Use Excel to perform a dependent sample t-test to determine whether the difference between the mean pretest score and the mean posttest score is significantly different. Assume unequal variance. Subject Pretest Posttest 1 21 25 2 30 33 3 25 26 4 28 31 5 31 34 6 16 16 7 19 21 8 21 24 9 26 27 10 34 34 11 22 23 12 18 24 13 14 17 14 19 23 15 24 25 16 33 30 17 25 27 18 26 26 19 22 24 20 19 18
The durations (minutes) of 26 electric power outages in the community of Sonando Heights over the past five years are shown below. 38 48 22 69 24 15 53 14 48 1 13 42 42 99 30 18 12 53 19 2 17 26 93 25 16 20 Click here for the Excel Data File (a) Find the mean, median, and mode. (Round your answers to 2 decimal places.) Descriptive Statistics Data Mean Median Mode (b) Are the mean and median about the same? (Click to select) Yes No , the mean is (Click to select) greater than less than the median. (c) Is the mode a good measure of center for this data set? Yes No (d) Is the distribution skewed? Yes, the distribution is skewed left. No, the distribution is symmetric. Yes, the distribution is skewed right.
Samples of starting annual salaries for individuals entering the public accounting and financial planning professions follow. Annual salaries are shown in thousands of dollars. Public Accountant 51.2 59.8 56.3 58.2 55.2 56.0 51.9 60.5 57.0 50.9 Financial Planner 50.0 49.2 54.1 56.9 50.9 53.6 Find the value of the test statistic. W = 75.50 X 49.7 53.9 51.8 48.9 (a) Use a 0.05 level of significance and test the hypothesis that there is no difference between the starting annual salaries of public accountants and financial planners. State the null and alternative hypotheses. O Ho: The two populations of salaries are not identical. H₂: The two populations of salaries are identical. O Ho: Median salary for public accountants - Median salary for financial planners 20 H₂: Median salary for public accountants - Median salary for financial planners 0 O Ho: Median salary for public accountants - Median salary for financial planners > 0 H₂: ₂: Median salary for public accountants - Median salary…
The ages (in years) of a random sample of shoppers at a gaming store are shown. Determine the range, mean, variance, and standard deviation of the sample data set. 12, 20, 23, 14, 18, 18, 19, 18, 15, 19 1) The range is ______ 2) The mean is ______ 3) The variance is ________
Statistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: Grades 73.5 63.9 64.3 85.5 62.7 69 88 63.9 65 64.3 Test grades are believed to be normally distributed.Use a significance level of 5%.
A study found that there was 48% chance that the driver fails a breathalyzer test when it is administered on a Friday night. The test is administered to 80 drivers. What distribution that can be used to model the above situation. How many drivers do we expect to fail the test
The durations (minutes) of 26 electric power outages In the community of Sonando Heights over the past five years are shown below. 35 48 25 65 25 57 11 51 15 46 41 101 32 17 13 50 23 5 18 26 89 28 13 19 Clck here for the Excel Date File (a) Find the mean, median, and mode. (Round your answers to 2 decimal places.) Descriptive Statistics Data Mean Median Mode (b) Are the mean and medlan about the same? (Click to select) * , the mean is (Click to select) ] the medlan. (c) Is the mode a good measure of center for this data set? Yes O No (d) Is the distribution skewed? O No, the distributlon is symmetric. O Yes, the distributlon Is skewed left. O Yes, the distributlon is skewed right.
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