Answered: tourists

Math

Statistics

tourists

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A new procedure mixing Calcium hydroxide and Calcium silicate hydride nanotubes with concrete has been developed, and the strengths of various concrete specimens have been measured based on the relative proportion of calcium hydroxide and calcium silicate hydride tubes.3 treatments are shown in the table below, 100% calcium hydroxide, 50% Calcium Hydroxide and 50% Calcium silicate hydride, and 100% calcium silicate hydride, all added as ~ 1% of the mixture to the concrete . Eight samples of each were used to produce the means and variances. A) Run ANOVA on this data to see if there are any differences B) Why might classical ANOVA be inappropriate for this data set?
In a survey conducted by a website, employers were asked if they had ever sent an employee home because they were dressed inappropriately. A total of 2754 employers responded to the survey, with 978 saying that they had sent an employee home for inappropriate attire. In a press release, the website makes the claim that more than one-third of employers have sent an employee home to change clothes.Do the sample data provide convincing evidence in support of this claim? Test the relevant hypotheses using α = 0.05. For purposes of this exercise, assume that it is reasonable to regard the sample as representative of employers in the United States. (Round your test statistic to two decimal places and your P-value to four decimal places.) z = P-value = z value i got was 2.46 p value i tried 0.0069 and 0.0070 and both were wrong
wu.aleks.com.jpeg A marriage counselor has traditionally seen that the proportion p of all married couples for whom her communication program can prevent divorce is 76%. After making some recent changes, the marriage counselor now claims that her program can prevent divorce in more than 76% of married couples. In a random sample of 220 married couples who completed her program, 174 of them stayed together. Based on this sample, is there enough evidence to support the marriage counselor's claim at the 0.01 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis Ho and the alternative hypothesis H₁. Ho H₂ : O H₁ :0 (b) Determine the type of test statistic to use. (Choose one) ▼ (c) Find the value of the test statistic. (Round to three or more decimal places.) 1 (d) Find the p-value. (Round to three or more decimal…
The bad debt ratio for a financial institution is defined to be the dollar value of loans defaulted divided by the total dollar value of all loans made. Suppose that a random sample of sixty-five banks in Illinois is selected and that their bad debt ratios (recorded as a percentage) are presented in the sample. Banking officials claim that the mean bad debt ratio for all Midwestern banks is 3.5 percent and that the mean bad debt ratio for Illinois banks is higher. What is the null hypothesis? What is the t-value? bank Bad Debt Ratio 1 3.38 2 5.15 3 4.63 4 9.69 5 8.32 6 3.58 7 5.9 8 7.33 9 6.28 10 6.87 11 3.93 12 5.76 13 3.98 14 3.66 15 7.46 16 5.59 17 6.39 18 6.49 19 2.31 20 7.84 21 9.2 22 4.64 23 5.38 24 4.23 25 7.12 26 3.48 27 2.87 28 4.59 29 7.43 30 8.34 31 5.15 32 5.84 33 4.95 34 5.6 35 7.52 36 5.23 37 7.88 38 8.86 39 4.42 40 6.64 41 9.25 42 6.53 43 5.35 44 6.04 45 5.19 46 2.87 47 2.91…
7. Time magazine reported the result of a telephone poll of 800 adult Americans. The question posed of the Americans who were surveyed was: "Should the federal tax on cigarettes be raised to pay for health care reform?" 351 out of 605 non-smokers said "yes" and 41 our 195 smokers said "yes." The researcher suspects that smokers would not agree with the decision to tax. a. Conduct a 5-step hypothesis test at a 5% level of significance.
Of all sports, football accounts for the highest incidence of concussion in the United States due to the large number of athletes participating and the nature of the sport. While there is general agreement that concussion incidence can be reduced by making rule changes and teaching proper tackling technique, there remains debate as to whether helmet design may also reduce the incidence of concussion. Rowson et al. (2014) report on a retrospective analysis of head impact data collected between 2005 and 2010 from eight collegiate football teams. Concussion rates for players wearing two types of helmets, Riddell VSR4 and Riddell Revolution, were compared. A total of 1,281,444 head impacts were recorded, from which 64 concussions were diagnosed. The relative risk of sustaining a concussion in a Revolution helmet compared with a VSR4 helmet was 46.1%. This study illustrates that differences in the ability to reduce concussion risk exist between helmet models in football. Although helmet…
According to the Pew Research Center, the proportion of the American population who use only a cellular telephone (no landline) is 0.37. Jason conducts a survey of thirty 20- to 24-year-olds who live on their own and finds that 16 do not have a landline to their home. Does this provide sufficient evidence to conclude that the proportion of 20- to 24-year-olds who live on their own and don’t have a landline is greater than 0.37? Use an a=0.10 level of significance. Note
A poll in one country indicated that 48% favor imposing the death penalty (the country currently does not have it). The poll did not report the sample size but stated, "Polls of this size are considered to be accurate to within 2.3 percentage points 99% of the time." About how large was the sample size?
The Mayoral challenger claims that less than 30% of residents over the age of 25 have bachelor's degrees in our city. To test this claim, you survey 80 adults over the age of 25 and find only 18 possess bachelor's degrees. At the 5% level of significance, is there enough evidence to support the challengers claim?
The Excel file Room Inspection provides data for 100 room inspections at 25 hotels in a major chain. Management would like the proportion of nonconforming rooms to be less than 2%. Test an appropriate hypothesis to determine if management can make this claim.
An ABC News poll asked adults whether they felt genetically modified food was safe to eat. 35% felt it was safe, 52% felt it was not safe, and 13% had no opinion.A random sample of 120 adults was asked the same question at a local county fair. 40 people felt that genetically modified food was safe, 60 felt that it was not safe, and 20 had no opinion.At the 0.01 level of significance, is there sufficient evidence to conclude that the proportions differ from those reported in the survey? What is an apropriate alternate hypothesis for this problem? What is the critical value for this problem? What is the expected value for no opinion people? What is the Chi squared value for this problem? What is the appropriate decision?
According to the Federal Trade Commission report on consumer fraud and identity theft, 23% of all complaints in 2007 were for identity theft. This year, a certain state kept track of how many of its 1380 complaints were for identity theft. They want to know if the data provide enough evidence to show that this state had a different proportion of identity theft than 23%. State the sample statistic, population parameter, and hypotheses.a) The sample statistic in context is: Select an answer A randomly selected complaint filed with the FTC for that state. The percentage of 1380 randomly selected complaints filed with the FTC for that state that are for identity theft. The percentage of all complaints filed with the FTC for that state that are for identity theft. The mean number of all complaints filed with the FTC for that state that are for identity theft. The mean number of 1380 randomly selected complaints filed with the FTC for that state that are for identity theft. A randomly…