Answers:1a) t = 3.033, reject Ho: there is evidence for a significant increase in the number of tremorsb) 377.35 to 423.99 1. (Previous exam question) Over the past 50 years, an average of 370 minor earth tremors a day has been recorded inNorthern California. Recently, over a period of nine days, the following number of minor tremors were recorded:386, 394, 362, 423, 456, 370, 385, 430, 400a) Is there evidence for a recent increase in the number of tremors (a ≤.05)?b) Based on the 9-day data, form a 95% confidence interval to estimate the mean number of minor tremors thatmight be expected each day over the next several weeks.

Answered: Image /qna-images/answer/bae33276-4379-44a8-8aaa-a620a8635f33.jpg

Answered: . (Previous exam question) Over the…

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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From 1984 to 1985 the mean height of 15 to 18 year old males from Chile was 172.36 cm and the standard deviation was 6.34 cm. Let Y = the height of 15 to 18 year old males in 1984 to 1985 then Y ~ N ( 172.36, 6.34 ) a.) about 68% of the y values lie between what two values ? That z scores are respectively ? b.) about 98% of the y values lie between what two values ? That z scores are ? c.) about 99.7% of the y values lie between what two values ? That z scores are ?
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A new vaccination is being used in a laboratory experiment to investigate whether it is effective. Thereare 285 subjects in the study. Is there sufficient evidence to determine if vaccination and diseasestatus are related?Vaccination Status Diseased Not Diseased TotalVaccinated 77 85 162Not Vaccinated 63 60 123Total 140 145 285d) Find the value of the test statistic. Round your answer to three decimal places.g) Make the decision to reject or fail to reject the null hypothesis at the 0.025 level of significance.h) State the conclusion of the hypothesis test at the 0.025 level of significance.
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A one-way between subjects ANOVA produces SSbetween = 30, SSwithin = 60, and an F-ratio with df = 2, 15. For this analysis, what is the F-ratio? a) .05 b) 2 c) 3.75 d) .27
What is the appropriate conclusion for this test? (Do not reject OR reject) H₀ and conclude that there (is or is not) sufficient evidence that mice with an average life span of 32 months will live to be (less or greater) than 42 months old when 40% of the calories in their diet are replaced by vitamins and protein.
In a poll, 248 of 362 randomly selected baseball fans stated that they thought the designated hitter rule should either be expanded to both baseball leagues or eliminated. Based on the given information, is there sufficient evidence to conclude that a majority of baseball fans feel this way? Find the test statistic and P-value. (Use ? = 0.05. Round your test statistic to two decimal places and your P-value to four decimal places.) z= _______ b) A poll found that in a random sample of 1000 American adults, 715 indicated that they oppose the reinstatement of a military draft. Is there convincing evidence that the proportion of American adults who oppose reinstatement of the draft is greater than 0.7? Use a significance level of 0.05. (Round your test statistic to two decimal places and your P-value to four decimal places.) z = P =
Let p denote the population proportion of all buttered toast that will land with the buttered side down when dropped. Identify the null and alternative hypotheses to test the claim that buttered toast will land with the buttered side down 50% of the time. Ho p = H₁p 0.5 0.5 (Type integers or decimals. Do not round.) Identify the test statistic. z = -1.81 (Round to two decimal places as needed.) Identify the P-value. P-value = 0.070 (Round to three decimal places as needed.) State the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Fail to reject the null hypothesis. There is not sufficient evidence to warrant rejection of the claim that buttered toast will land with the buttered side down 50% of the time. Write a conclusion that addresses the test that the toast will land with the buttered side down more than 50% of the time. The intent of the experiment was to test Ho: p = down more than 50% of the time. 0.5 and H₁: p > 0.5.…
A1) - Calculate the mean speed [in mph] of 4 cars travelling at 46 mph and 4 cars travelling at 63 mph. A2) Calculate the root mean square speed [in mph] of 6 cars travelling at 43 mph and 7 cars travelling at 56 mph. Sidenote: for a1 I tried submitting the answer as 54.5 and it was wrong for a2 I tried submitting the answer as 50.42 and it was incorrect
You are playing a dice game with a friend and become suspicious that he is using weighted dice. So you stop the game, take one of his dice, and roll it 100 times. The results are in the table below. Do these results provide significant evidence that the proportion of times the dice lands on the six numbers are unequal? Calculate the chi-squared test statistic and the range the p-value falls in for this test. Number on die 1 2 4 Frequency 16 21 6 26 13 18 test statistic = 14.12, p-value in (.01, .025) test statistic = 24.368, p-value in (.005, .01) test statistic = 14.12, p-value in (.025, 05) test statistic = 24.368, p-value less than .005 O none of these
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