· A company wishes to test if the new software system installed improved the mean waiting timefor a customer to talk to a service representative to less than 120 seconds. Is the following thecorrect hypothesis to test for this problem?H X =120H: X <120O Yes, this hypothesis is the correct one to testO No, this hypothesis is incorrectly written

The hypothesis testing process would involve collecting a sample of waiting times, calculating the…

Answered: • A company wishes to test if the new…

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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The results section of an article reports the following “IQ scores of the sample differ from the population mean of 100, single sample t (19) = 2.80, p < .05, two tail”. Based on this result, how many people were included in the sample? Select one: 20 21 19 38
for one week) and S hypertensive controls (received placebo for one week) were involved, chosen from Al-Hussein Teaching Hospital in 2010. The results below were revealed: Statistics Mean SBP 150 S.D Cases Controls |142 12 9 Find out whether the (drug used has a significant effect on the blood pressure level.
A medical researcher says that 25% of U.S. adults are smokers. In a random sample of 272 US, adults, 57 say that they are smokers at a- 0.05, is there enough evidence to support that less than 25% of U.S. adults are smokers? What shall we use for Ho and Hy? Hg p-0.25 Hp 025 Ho p> 025 Hi:p<025
Week 9 – Hypothesis Testing oExamples of null and alternative hypotheses that are one and two sided, explaining how to distinguish between them. oExamples of z-test for proportion, z-test for mean, t-test for mean with explanations of when you use each one and why, with computations. oInterpretations of p-values for each of the above with context
You are a consumer psychologist interested in holidy spending. A national census reports that the American family spent an average of μ = $81 for Halloween candy and costumes last year. A sample of N = 16 families this year produced a mean of $85 with s = 20 A) State your non-directional null and alternative hypothesis
When using a Chi-square test, the expected frequency, E, has to be at least 5. State two possible approaches that can be implemented when the expected frequency, E, is less than 5.
Please no written by hand solution and no img . Pairs of hypotheses about a claim (a statistic of the population, like its mean, μ) include the following: (A) H0: μ ³ k and Ha: μ < k, where k is some value (B) H0: μ = k and Ha: μ ≠ k, where k is some value (C) H0: μ > k and Ha: μ £ k, where k is some value (D) H0: μ £ k and Ha: μ > k, where k is some value (E) H0: μ < k and Ha: μ ³ k, where k is some value
The average age of managers in a particular industry is over 35 years old, and we wishe to prove this. The null hypothesis to conduct a statistical test on this theory would be: the population mean is ˃ 35, or the population mean is ≤ 35 or the population mean = 35 or the population mean is ≥ 35.
The mean time taken to submit an assignment by a student was 20 days according to the previous semester record. The Exam office claimed that this year the submission time increased due to the natural calamities. Was thesubmission time really increased or not. Test the hypothesis with a 5% level of significance. The time taken by 15 students to submit their assignment are given below (14+a), (15+b),(16+c),(17+d),( 18+e) ,19, (20+a), (21+b),(22+c), (23+d),(24+e),(25+f), (26+a),(27+b), (28+c). values: a=1, b=9, c=1, d=9, e=4, f=6, g=3
Your medical research team investigating the mean cost of a 30-day supply of a certain heart medication. A pharmaceutical company thinks that the mean cost is more than $64. You want to support this claim. How would you write the null and alternative hypotheses? Ho: H₂:

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