Homework: Secti..Quontion 8, 8.2.10-THW Score: 48A%, 4.30 of O pointsO Polnts: 0 of 1Part 1 of4Savena study of cell phone unage and brain hemispheric dominance, an Internet survey was e mailed to 6002 subjects randomty selected from an orlina group involvedwith ears There were 1304 surveys returned. Use a 001 signficance leve! to test the claim that the retum rate is less than 20% Use the Pvalue method and use emormal distribution as an approximation to the binomial distributondentify thn nult hypothosis and alternative hypothesis.DA. Hi p-02Hpr02OB. 1 pe02H, pe02DC. Hg: p-02H, p>02OD. H p>0.2H: p=02DE. H: p=0.2OF. Hyi pr02Hp=02H,: p<02

Answer: The appropriate null and alternative hypothesis are, H0 : p= 0.20 H1: p < 0.20 Option E…

Answered: na study of cell phone usage and brain…

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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Use test concerning proportions: *A registrar claims that 45% of their students change their major after their 2nd yr due to retention policy. A random sample of 125 revealed that 50 students had changed their major after their 2nd Is there a decrease in the proportion of students who changed their major after their 2nd yr, test at 0.02 level of significance.
In a recent year, a city had 687 auto accidents. Assume that Poisson distribution applies. Round answers to one decimal place. a) The mean number of auto accidents per day is . b) The standard deviation is . c) The variance is .
Consider the heights of a random sample of 12 eldest sons in inches with a sample variance of 3.537878788 square inches: 68, 66, 68, 65, 69, 66, 68, 65, 71, 67, 68, 70 Describe the distribution (symmetric, positively skewed, or negatively skewed) based on Pearson’s second coefficient of skewness. Report final answer to 2 decimal places
REM (rapid eye movement) sleep is sleep during which most dreams occur. Each night a person has both REM and non-REM sleep. However, it is thought that children have more REM sleep than adults†. Assume that REM sleep time is normally distributed for both children and adults. A random sample of n1 = 11 children (9 years old) showed that they had an average REM sleep time of x1 = 2.5 hours per night. From previous studies, it is known that σ1 = 0.6 hour. Another random sample of n2 = 11 adults showed that they had an average REM sleep time of x2 = 1.80 hours per night. Previous studies show that σ2 = 0.7 hour. Do these data indicate that, on average, children tend to have more REM sleep than adults? Use a 1% level of significance.A) What is the value of the sample test statistic? (Test the difference μ1 − μ2. Round your answer to two decimal places.)B) Find (or estimate) the P-value. (Round your answer to four decimal places.)
The lifetime of a certain type of car engine is normally distributed with a mean of 200,000 miles and a standard deviation of 30,000 miles. An automaker claims that the new-year model has an engine with a longer average lifetime. A sample of 16 cars with this type of engine from the new model is obtained for a test. Consider a rejection region { ≥ 215,000}. a) What hypotheses should be tested? b) Find the probability of a type 1 error. c) Suppose that a further study establishes that, in fact, the average lifetime of the new engine is 210,000 miles. Find the probability of a type II error. Show your reasoning.
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The average wait time to get seated at a popular restaurant in the city on a Friday night is 13 minutes. Is the mean wait time different for men who wear a tie? Wait times for 12 randomly selected men who were wearing a tie are shown below. Assume that the distribution of the population is normal. 12, 11, 14, 13, 14, 11, 13, 12, 13, 13, 11, 12 What can be concluded at the the a = 0.01 level of significance level of significance? a. For this study, we should use b. The null and alternative hypotheses would be: Select an answer Но: Select an answer ? H1: ? Select an answer c. The test statistic ? (please show your answer to 3 decimal places.) d. The p-value = (Please show your answer to 4 decimal places.) %3D e. The p-value is ? f. Based on this, we should O the null hypothesis. Select an answer g. Thus, the final conclusion is that ... The data suggest the populaton mean is significantly different from 13 at a = 0.01, so there is statistically significant evidence to conclude that the…
The score in the final statistics exam is distributed as a normal random variable with mean of 72 and standard deviation of 7 points. Determine: If a sample of 10 students is taken, deteremine the probability that the mean sample score is greater than 75 is: (use 4 decimal places)
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