13. Two groups of 100 people each were taken for testing the use of a vaccine 15persons contracted the disease out of the inoculated persons, while 25 contracted the disease in theotherTest the efficacy of the vaccine using x-Value.At 5% level for one degree of freedom, the value of x = 3.84.group.%3D

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Answered: 13. Two groups of 100 people each were…

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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Forty-eight percent of people believe that there is life on other planets in the universe. A scientist does not agree with this finding. He surveyed 130 randomly selected individuals and found 52 believed that there is life on other planets. At α=0.05, is there sufficient evidence to conclude that the percentage differs from 48%? Use the critical value method with tables. Critical values are: -1.96, 1.96 Compute the test value. Round the answer to at least two decimal places. Thank you very much!
Determine the Availability and downtime per year
You take a survey that is supposed to measure whether you are an extrovert or not. The score you get on the extrovert survey is a z-score of 2.0. What does that mean about your level of extraversion compared to the average score?
A large automobile insurance company selected samples of single and married male policyholders and recorded the number who made an insurance claim over the preceding three-year period. Single Policyholders Married Policyholders n1=550 n2=1,000 Number making claims = 110 Number making claims = 150 a. Use a=0.05 Test to determine whether the claim rates differ between single and married male policyholders. z-value (to 2 decimals) p-value (to 4 decimals) b. Provide a 95% confidence interval (to 4 decimals) for the difference between the proportions for the two populations. Enter negative answer as negative number. ( , )
Does training in stress reduction make a difference for student success? 15 students received training (M1= 88, SS1= 400) and 15 students did not (M2= 82, SS2= 440). Test using α = .05 What type of error could you be making?
You want to obtain a sample to esimate a population proportion. Based on previous evidence you believe the population proportion is approximately p*=21%. You would loke to be 99.9% confident that you estomate within 1% of the true population proportion. How large of a sample size is required?
i need the answer quickly
A past survey claimed that at least 15% of sports activities per day. In a sample of 160 students, 25 said they spend more than 2 hours on sports activities per day. Test the claim at a = 0.05. students spend more than 2 hours on
A repeated measures study with n=26 participants produces a mean difference of M D = 3 points, SS=500 for the difference scores, and t=2.50. Calculate Cohen's d and r square (r2) to measure the effect size for this study.
Sean also took the SAT (μ=1010,σ=200) and had a z score of +0.25. What was his SAT raw score? What was his percentile?
On average, a sample of n = 36 scores will provide a better estimate of the population mean than a sample of n = 49 scores from the same population.
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