الله3G4G24↓↑Question 3A sample of 44 commuters in Chicago showed the average of the commuting times was 33.2 minutes. Ifthe standard deviation was 8.3 minutes(a) Find the 95% confidence interval of the true mean.(b) Test the Hypothesis Ho: μ = 10 against H₁:µ > 0.lll 13% 22:36

The following information has been given: The sample size is n=44. The sample mean is x¯=33.2. The…

Answered: Question 3 A sample of 44 commuters in…

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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It the weights of students in U.OJ. are bell-shaped. We take a sample of 4200 students with mean 75 kgs and variance 9 kgs. Find the weight for which 2100 students are smaller? Select one Oa 72 Ob70 O 75
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in a test of a lifelong brand of tires , a survey revealed that the mean life was 35,000 mikes and the standard deviation was 7083 mikes. if the shape of the population distribution is known to be normal, approximately what percentage of the tires lasts less than 20834 miles ?
QUESTION 22 Suppose that the average number of grams of fat consumed in a day for the sample of 9 adults is 77 grams with a standard deviation of 24.1 grams. If the fat consumption by adults is normally distributed, find the margin of error (E) of the 90% confidence interval for the mean number of grams of fat consumed daily by adults. Round your answer to one decimal place.
If a standard deviation is 1.4 away from a mean of 7.2 what is the z score of an x value of 10
Question 22 SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college. If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample? > Next Question hp Ce % & 3. 7 8 9 16 %24
75 specimens of the new chip were tested and 67 specimens of the old chip were tested. The average speed, in MHz, for the new chips was 494.9 and the standard deviation was 19.3. The average speed of the old chips was 485.8 and the standard deviation was 16.7. Suppose we wish to test Ho : Hx - Hy = 0 versus H1 : Hx - Hy # 0. Calculate the z-score. (answers are considered correct if they're within 5% of the correct value)
Part 1 of 4 Suppose that you randomly survey death records for people born in 1900 in Virginia and compared the life span of two different ethnicities. Of the 132 individuals sampled from ethnicity 1, the mean life span was 58.5 years with a standard deviation of 16.9 years. Of the 191 individuals sampled from ethnicity 2, the mean life span was 54.3 years with a standard deviation of 10.3 years. Conduct a hypothesis test with a 7% level of significance to see if the mean life spans in Virginia were the same for the two ethnicities. Step 1: State the null and alternative hypotheses. Ho: 12V✓0 Ha: 1₂V0 (So we will be performing a two-tailed Part 2 of 4 Step 2: Assuming the null hypothesis is true, determine the features of the distribution of the differences of sample means. The differences of sample means are t-distributed and distribution standard deviation Question Help: Post to forum C Submit Part test.) 06 ✓✓with distribution mean MacBook Pro Search or type URL ...........
QUESTION 10 The daily electrical energy consumption (in Watts) during July for a random sample of 11 households was recorded. The mean was 3005 W and the standard deviation was 455 W. Assume the underlying distribution of the consumption is normal. Find the marging of error E of the 95% confidence interval for the mean daily electrical energy consumption during that month. Round your answer to two decimal places.
Question 20. part b. Nationally, patients who go to the emergency room wait an average of 7 hours to be admitted into the hospital. Do patients at rural hospitals have a lower waiting time? The 14 randomly selected patients who went to the emergency room at rural hospitals waited an average of 5.8 hours to be admitted into the hospital. The standard deviation for these 14 patients was 1.7 hours. What can be concluded at the the αα = 0.05 level of significance level of significance? C.)The test statistic ?, z or t = ____ (please show your answer to 3 decimal places.) D.)The p-value = ______ (Please show your answer to 4 decimal places.) E.) The p-value is ?, ≤ , > α
Question 7: give the test statistic

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Question 3 A sample of 44 commuters in Chicago showed the average of the commuting times was 33.2 minutes. If the standard deviation was 8.3 minutes (a) Find the 95% confidence interval of the true mean. (b) Test the Hypothesis Ho: μ = 10 against H₁:μ > 0.