9. Length of Hospital Stays The average length of"short hospital stays" for men is slightly longer thanthat for women, 5.2 days versus 4.5 days. A randomsample of recent hospital stays for both men andwomen revealed the following. At a-0.01, is theresufficient evidence to conclude that the average hospitalstay for men is longer than the average hospital stay forwomen?MenWomenSample sizeSample meanPopulation standard deviation32305.5 days1.2 days4.2 days1.5 daysSource: www.cdc.gov/nchs

We have given that Sample sizes n1=32 , n2= 30 Sample means X̄1= 5.5 , X̄2= 4.2…

Answered: 9. Length of Hospital Stays The average…

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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Weights of whole walnuts are normally distributed with mean 9.2 grams and standard deviation 0.104 grams. What proportion of walnuts weigh less than 8.9722 grams? What proportion of walnuts weigh more than 9.0315 grams? Use the closest value in the normal table, and show all four decimals.
Assum a sample is used to estimate a populatation mean. Find the 95% confidence interval for a sample size of 41 with a mean of 64.2 and a standard deviation of 13.4. Enter answer as an open interval (i.e. parentheses) accurate to 3 decimal places.
21)
Job satisfaction as a function of a work schedule was investigated in different factories. In the first factory, the employees are on fixed shift system while in the second factor, the workers have rotating shift system. Using the data in the table below, determine if there is a significant difference in job satisfaction between the two groups of workers. Use 0.01 level of significance. Shift Schedule Mean Standard Deviation Sample size Fixed 7.43 2.42 23 Rotating 6.18 2.15 29
Suppose the total weight of passengers and luggage on an airline flight is normally distributed with mean 8914 and standard deviation 32 What is the 2.28th percentile of total passenger weight
PLEASE ONLY SELECT THE ANSWERS AS SHOWN FOR THE MULTIPLE CHOICE, SUCH AS OPTION 1, 2, ETC. 1) In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.8 and a standard deviation of 1.51. Use a 0.10 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. What are the null and alternative hypotheses? A. H0: μ=0 mg/dL H1: μ<0 mg/dL B. H0: μ>0 mg/dL H1: μ<0 mg/dL C. H0: μ=0 mg/dL H1: μ≠0 mg/dL D. H0: μ=0 mg/dL H1: μ>0 mg/dL…
significance level is 99%
Arecent study of the lifetimes of cell phones found the average of a certain brand is 36.5 months. The standard deviation is 4.6 months. If a company provides this brand to 33 employees, what is the mean lifetime of the sample for which 30% are above it?
1) SAT verbal scores are normally distributed with a mean of 400 and a standard deviation of 90. Use the Empirical Rule to determine what percent of the scores lies between 400 and 670. * Your answer
what is the minimum pregnancy length that can be in the top 8% of pregnancy given a mean of 265 and a standard deviation of 12
The mean age when smokers first start is 13 years old with a population standard deviation of 1.8 years. A researcher thinks that smoking age has significantly changed since the invention of ENDS-electronic nicotine delivery systems. A survey of smokers of this generation was done to see if the mean age has changed. The sample of 33 smokers found that their mean starting age was 12 years old. What type of test should you use? A) z-test for population mean B) t-test for population mean C) z-test for population proportion
6. Test a claim that the mean amount of lead in the air in U.S. cities is less than 0.035 microgram per cubic meter. It was found that the mean amount of lead in the air for the random sample of 58 U.S. cities is 0.038 microgram per cubic meter and the standard deviation is 0.069 microgram per cubic meter. At a = 0.10, can the claim be supported? Complete parts (a) through (e) below. Assume the population is normally distributed. (a) Identify the claim and state Ho and Ha Ho: (1) На (3) (4) (Type integers or decimals. Do not round.) The claim is the (5) hypothesis. (b) Find the critical value(s) and identify the rejection region(s). The critical value(s) is/are to = (Use a comma to separate answers as needed. Round to two decimal places as needed.) Choose the graph which shows the rejection region. OA. OB. OC. OD. - to to t to (c) Find the standardized test statistic, t. The standardized test statistic is t= (Use a comma to separate answers as needed. Round to two decimal places as…

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