A mortality study consists of 10 individuals. Deaths are recorded at the following times (in years):3 5 9 14 1416 17 22 28 36Time until death is fitted to an exponential distribution with mean 0 using maximum likelihood.0, is the maximum likelihood estimate of 0 had the study been terminated after 10 years.02 is the maximum likelihood estimate of 0 had the study been terminated after 15 years.0z is the maximum likelihood estimate of 0 had the study been terminated after 20 years.Rank the maximum likelihood estimates of 0 in ascending order.ô, < ô2 < ôgAô < ô3 < Ô2Bôz < ô, < ô3ô, < ôg < ô,Ô3 < ô2 < ô,E

In this question, we are given a mortality study consisting of 10 individuals, and the recorded…

Answered: A mortality study consists of 10…

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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Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 159 smartphone users. a-1. What is the expected value and the standard error of the sample proportion? Note: Round "Expected value" to 2 decimal places and "Standard error" to 4 decimal places. a-2. Is it appropriate to use the normal distribution approximation for the sample proportion? multiple choice Yes, because np ≥ 5 and n(1 - p) ≥ 5 Yes, because n ≥ 30 No, because np ≥ 5 and n(1 - p) ≥ 5 No, because n < 30 b. What is the probability that more than 24% of smartphone users in the sample have fallen prey to cyber-attack? Note: Round final answer to 2 decimal places.
Suppose that one in six smartphone users have fallen prey to cyber-attack. We use a sample of 200 smartphone users. a-1. What is the expected value and the standard error of the sample proportion? Note: Round "Expected value" to 2 decimal places and "Standard error" to 4 decimal places. a-2. Is it appropriate to use the normal distribution approximation for the sample proportion? multiple choice Yes, because np ≥ 5 and n(1 - p) ≥ 5 Yes, because n ≥ 30 No, because np ≥ 5 and n(1 - p) ≥ 5 No, because n < 30 b. What is the probability that more than 20% of smartphone users in the sample have fallen prey to cyber-attack? Note: Round final answer to 2 decimal places.
A population of values has a normal distribution with M=153.9 and O=82.9 You intend to draw a random sample of size n=115. A). Find P86, which is the score separating the bottom 86% scores from the top 14% scores. P86 (for single values) =__________ B). Find P86, which is the mean separating the bottom 86% means from the top 14% means. P86 (for sample means) =_________
In a field test, 30 units have been tested for 125 hours each with the following failure times. In the event of a failure, the unit was repaired and the test continued. [Hint: use the exponential distribution] 10, 26, 31, 55, 75, 90, 120 What is the failure rate of the units based on this information? Write the Reliability function. What is the survival probability of the units at time 50 and time 100? Sketch the hazard plot based on the assumptions made. Solve for t at R(t)=0.90?
Heart rates are determined before and 30 minutes after a Kettleball workout. It can be assumed that heart rates (bpm) are normally distributed. Use the data provided below to test to determine if average heart rates prior to the workout are significantly lower than 30 minutes after a Kettleball workout at the 0.02 level of significance. Let 41 = mean before workout. before 70 68 69 74 72 67 61 after 73 69 76 76 72 71 63 Select the correct Hypotheses: Ho: Ha 12 Ho:1 = µ2 Ho:Hd = 0 Ho:µd >0 Ha:Ha > 0 Ha:H1 > H2 Ha:i < µ2 Ha:µ1 + µ2 Ha:Hd # 0 Ha:µd <0 Test Statistic = [three decimal accuracy] p-value = [three decimal accuracy] Conclusion: O Fail to Reject Ho O Reject Ho Interpret the conclusion in context: O There is not enough evidence to suggest the mean bpm before a Kettleball workout is lower than 30
An online math tutor service would like to claim that the average time spent taking a standardized test after students go through tutoring is less than the average time spent before going through tutoring. A simple random sample of students takes a pre-test, then goes through tutoring and takes a post-test. Results of the sample are shown below. Mean Variance Observations Pearson Correlation Hypothesized Mean Difference df t Stat P(T<=t) one-tail t Critical one-tail P(T<=t) two-tail t Critical two-tail Confidence Level Before After 82.333 74.944 110.118 199.820 18 0.727 18 0 17 -3.227 0.002 -1.740 0.005 -2.110 99% What are the population parameters? Pick Is the two-sample hypothesis test a paired t-test or an unpaired t-test? Pick What is the level of significance? Ex: 0.12 What is the null hypothesis? Ho: Mafter Pick Mbefore What is the alternative hypothesis? Ha : Pafter Pick Should Ho be rejected or does Ho fail to be rejected? Pick What conclusion can be drawn from the data? Pick…
A teacher believes that the third homework assignment is a key predictor in how well students will do on the midterm. Let x represent the third homework score and y the midterm exam score. A random sample of last terms students were selected and their grades are shown below. Assume scores are normally distributed. HW3 Midterm 6.1 37.359 23 75.37 18.9 73.391 24.9 79.531 21.9 77.961 23.8 78.122 20.6 73.114 22.6 73.494 8.4 46.396 6.6 38.454 10.7 50.433 21 77.99 22.1 76.399 6 41.14 22.4 73.056 14.1 58.879 9.9 48.681 15 58.85 19.3 69.267 18 72.42 Round answers to at least 4 decimal places. a) Calculate the correlation coefficient. r= Perform a hypothesis test to see if the correlation is statistically significant. What is the p-value? b) Find the regression equation y^ = Predict the exam score for a student that scored 26.9 on their third homework assignment. c) Interpret the slope coefficient. For 2.2342 additional points on…
Single-Sample z test. Here are the Degree of Reading Power (DRP) scores for a random sample of 10 third grade students in the Albany City school district: 31, 27, 38, 34, 42, 28, 26, 43, 46, 27 You wonder whether the mean score of this sample is greater than the population mean of all third grade students in the Albany City school district, which is 30. Suppose scores on the DRP are known to be normally distributed with a population standard deviation of 11. Step 1) Population 1 (Sample): Population 2: Null Hypothesis (H0): Research Hypothesis (H1): Step 2) Determine the characteristics of the comparison distribution. Sample Mean = M = _________ Mean of the population = μ = ________ Population standard deviation = = _________ Standard deviation of distribution of means = = __________ Step 3) Determine the cutoff score on the z distribution (use a 0.05 p value). Cut-off score = _________ Step 4) Determine your sample’s z score. z = ___________ Step…
Determine whether carpeted rooms have more bacteria than uncarpeted rooms at the a = 0.05 level of significance. Normal probability plots indicate that the data are approximately normal and boxplots indicate that there are no outliers. State the null and alternative hypotheses. Let population 1 be carpeted rooms and population 2 be uncarpeted rooms. A. Ho: H1= H2 H1: H1> H2 B. Ho: H1 H2 c. Hoi H1= H2 H1: H1
Using the unemployment data provided, investigate the association between the male unemployment rate in 2007 and 2010 for a sample of 52 countries. Complete parts (a) through (4). m Click the icon to view the data table. OC The plot of the residuals against x tends to cluster as x increases, which is a possible violation of the Linearity Conditon. The Normal probability plot indicates that the Normal Population Assumption is satisfied. OD. The plot of the residuals againat x shows no patten, which satisfes the conditions for linear regression. The Normal probability plot indicates that the Nomal Probability Assumption is violated. c) Test an appropriate hypothesis using a- 0,05 to determine it the association is signiftcant. Choose the corect nul and altemative hypotheses. OA Ha: 0 OB. Ho: lo " 0 HA P0 or l 0 O C. Ho Po-0 OD. Ho: la =P HA Po
A farm is breeding sheep and has been keeping records of the number of new-born to each sheep during the first five years of animal's life span. The results are presented below: No. of New Born0 1 2 3 4 5 No. of Sheep | 4 19 41 52 26 8 Test whether the binomial distribution is an adequate model for the data.

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