est).2364912.qx3zqy7Jump to level 1A company would like to know if efficiency can be improved through a training course for eemployees is taken. The time taken for an employee to complete a task before training ancBefore33.1MeanVarianceObservationsHypothesized Mean Difference12.25DEIPIStatP(T<+t) one-tailt Critical one tailp3 Ex 1.234TSO'OP(T<+t) two-tailL Critical two-tail-2.0453.t = Ex: 1.234n=Ex: 9Degrees of freedom: dfEx: 1.234Point estimate for before training: 1Point estimate for after training,

Answered: est). 2364912.qx3zqy7 Jump to level 1 A…

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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O DESCRIPTIVE STATISTICS Mean, median, and mode: Comparisons The total blood cholesterol level was measured for each of 21 adults. Here are the 21 measurements (in mg/dL). 132, 144, 151, 153, 165, 167, 176, 180, 184, 184, 184, 194, 195, 196, 196, 210, 211, 214, 219, 234, 241 Send data to calculator Send data to Excel Frequency 10 6. 8- 6+ 4 4 2- 150 175 200 225 250 125 Cholesterol level (in mg/dL) OMean (a) For these data, which measures of central tendency take more than one value? Choose all that apply. OMedian O Mode ONone of these measures (b) Suppose that the measurement 241 (the OMean largest measurement in the data set) were Median Check Explanation 2021 McGraw-Hl Education. All Righ II
Question 6 of 6 - /2 E View Policies Current Attempt in Progress Fast Auto Service provides oil and lube service for cars. It is known that the mean time taken for oil and lube service at this garage is 15 minutes per car and the standard deviation is 2.4 minutes. The management wants to promote the business by guaranteeing a maximum waiting time for its customers. If a customer's car is not serviced within that period, the customer will receive a 50 % discount on the charges. The company wants to limit this discount to at most 4% of the customers. What should the maximum guaranteed waiting time be? Assume that the times taken for oil and lube service for all cars have a normal distribution. Round your answer to the nearest minute. The maximum guaranteed waiting time should be approximately i minutes. eTextbook and Media Save for Later Attempts: 0 of 5 used Submit Answer 50 e Type here to search
1. Describe the key features of the normal curve and explain why the normal curve in real-life distributions nevermatches the model perfectly.
Chapter 9, Section 2, Exercise 030 Use the following ANOVA table for regression to answer the questions. Analysis of Variance Source DF SS MS F P Regression 1 304.5 304.5 2.01 0.158 Residual Error 174 26361.0 151.5 Total 175 26665.5 Give the F-statistic and p-value.Enter the exact answers.The F-statistic is=The p-value is=
5. Oxygen demand is a term blologists use to describe the axygen needed by fish and other aquatic organisms for survval. The Environmental Protection Agency conducted a study of a wetland area in Marin County, Californla. In this wetland environment, the mean oxygen demand was u=9.9 mg/L, and a= 1.7 mg/L. (Reference: EPA Report 832-R- 93- 005). Let x be a random varlable that represents oxygen demand in this wetland environment. Assume x has a probability distribution that is approximately normal. a. An oxygen demand below 8 mg/L Indicates that some organisms In the wetland environment may be dying. What is the probability that the oxygen demand will fall below 8 mg/L? b. A high oxygen demand can also indicate trouble. An oxygen demand above 12 mg/L may indicate an overabundance of organisms that endanger some types of plant life. What is the probability that the oxygen demand will exceed 12 mg/L?
10.2.17 Question Help v Listed below are systolic blood pressure measurements (in mm Hg) obtained from the same woman. Find the regression equation, letting the right arm blood pressure be the predictor (x) variable. Find the best predicted systolic blood pressure in the left arm given that the systolic blood pressure in the right arm is 85 mm Hg. Use a significance level of 0.05. Right Arm 102 101 95 75 74 O Left Arm 176 169 147 143 145 E Click the icon to view the critical values of the Pearson correlation coefficient r The regression equation is y =+ x. (Round to one decimal place as needed.) Enter your answer in the edit fields and then click Check Answer. 1 part remaining Clear All Check Answer Windows Ink Workspace 9:32 PM P Type here to search 4/26/2021 (8)
Cardiovascular Disease Suppose the incidence rate of myocardial infarction (MI) was 5 per 1000 among 45- to 54-year-old men in 2000. To look at changes in incidence over time, 5000 men in this age group were followed for 1 year starting in 2010. Fifteen new cases of MI were found. 7.14 Of the 15 new MI cases in the preceding study, 5 died within 24 hours. Test whether the 24-hour case- fatality rate changed from 2000 to 2010.
Scores on a certain exam are normally distributed with a mean of 90 and a variance of 25. What is the z-value for a score of 80? -2.0 -0.4 1.0 2.0 0.4
Stoaches are fictional creatures, sometimes mistaken for mome raths. Suppose a two-tailed t-test is conducted to test for a difference between the population means of adult female stoach weights and adult male stoach weights. The female sample has 13 weights, and the male sample has 7 weights. The t-statistic for the test is -0.20542. What is the p-value? (Give your answer to 4 decimal places.) p-value:
QUESTION 20 A treatment for anxiety is found to demonstrate a consistent reduction of anxiety sympotms by 2 points on a 50- point anxiety symptoms scale. Although patients overall do not report feeling much difference, the experiemnter finds that the change in symptoms on the anxiety symptoms scale results in a p-value of less than .05. This is an example of A statitically significant effect that does not have clinical/practical significance A clinically significant change which is supported by a statistically significant effect A correlational research design A placebo effect
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