18. A study was carried out to investigate whether the type of milk used is the same among young pcople as among older oncs. A sample of 500 pcople were classificd as given below. Skimmed milk Semi-skimmed milk Homogenized milk Total Age < 45 Age > 45 138 83 64 285 64 67 84 215 202 150 148 500 (a) State in words the appropriate null and alternative hypotheses. (b) Is the type of milk used is the same among young people as among older ones? Justify your answer. (c) Examine the residuals and draw appropriate conclusions.

18. A study was carried out to investigate whether the type of milk used is the same among young pcople as among older oncs. A sample of 500 pcople were classificd as given below. Skimmed milk Semi-skimmed milk Homogenized milk Total Age < 45 Age > 45 138 83 64 285 64 67 84 215 202 150 148 500 (a) State in words the appropriate null and alternative hypotheses. (b) Is the type of milk used is the same among young people as among older ones? Justify your answer. (c) Examine the residuals and draw appropriate conclusions.

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

Suppose 212 subjects are treated with a drug that is used to treat pain and 54 of them developed nausea. Use a 0.05 significance level to test the claim that more than 20% of users develop nausea. The test statistic for this hypothesis test is (Round to two decimal places as needed.) Identify the P-value for this hypothesis test. The P-value for this hypothesis test is (Round to three decimal places as needed.) Identify the conclusion for this hunnthacic tact ………. 4
A police department released the numbers of calls for the different days of the week during the month of October, as shown in the table to the right. Use a 0.01 significance level to test the claim that the different days of the week have the same frequencies of police calls. What is the fundamental error with this analysis? Day Sun Mon Tues Wed Thurs Fri Sat Frequency 158 202 230 240 179 215 233 Determine the null and alternative hypotheses. Ho- H4: ZE
only 20% of registered voters voted in the last election. will voter participation increase for the upcoming election? of the 341 randomly selected registered voters surveyed, 78 of them will vote in the upcoming election. what can be concluded at the...0.01 level of significance
According to a Pew Research Center nationwide telephone survey of adults conducted between March 15 and April 24, 2011, 55% of college graduates said that college education prepared them for a job (Time, May 30, 2011). Suppose this result was true of all college graduates at that time. In a recent sample of 1850 college graduates, 60% said that college education prepared them for a job. Is there significant evidence at a 2% significance level to conclude that the current percentage of all college graduates who will say that college education prepared them for a job is different from 55%? Use both the p-value and the critical-value approaches. Round your answers for the observed value of z and the critical value of z to two decimal places, and the p-value to four decimal places. Enter the critical values in increasing order.zobserved =Enter you answer; z_observed p-value =Enter you answer; p-value Critical values: Enter you answer; Critical value 1 and Enter you answer; Critical value…
1. Lumber companies dry freshly cut boards in kilns before selling them. As a result of the drying process, a certain percentage of the boards crack. The current drying procedure is known to produce cracks in 16% of the boards. The drying supervisor wants to test a new method to determine if fewer boards will crack. (a) State appropriate hypotheses for a significance test in this setting. To investigate, he selected an SRS of 50 boards, dried them using the new method, and found 5 that cracked (p =5/50 =0.10). To detemine if these data provide convincing evidence that less than 16% of the boards will crack when using the new method, 100 trials of a simulation were conducted. Each dot in the graph below shows the proportion of boards that cracked in a random sample of 50 boards, assuming that each board has a 16% chance of cracking. 0.05 0.15 02 0.25 0.1 Simukated sample proportion of boards that cracked (b) Use the simulation results to estimate the P-value of the test. (c) Interpret…
Suppose that in a random selection of 100 colored candies, 28% of them are blue. The candy company claims that the percentage of blue candies is equal to 24%. Use a 0.05 significance level to test that claim. ..... Identify the null and alternative hypotheses for this test. Choose the correct answer below. О А. Но: р-0.24 H1:p>0.24 О В. Но: р30.24 H1: p<0.24 О с. Но: р30.24 H1:p#0.24 O D. Ho: p#0.24 H1: p= 0.24 Identify the test statistic for this hypothesis test. The test statistic for this hypothesis test is (Round to two decimal places as needed.) Identify the P-value for this hypothesis test. The P-value for this hypothesis test is (Round to three decimal places as needed.) Identify the conclusion for this hypothesis test. O A. Reject Ho. There is sufficient evidence to warrant rejection of the claim that the percentage of blue candies is equal to 24% B. Fail to reject Ho. There is not sufficient evidence to warrant rejection of the claim that the percentage of blue candies is…
6. In a study of 809 randomly selected medical malpractice lawsuits, it was found that 486 of them were dropped or dismissed. Use a 0.01 significance level to test the claim that most medical malpractice lawsuits are dropped or dismissed. Which of the following is the hypothesis test to be conducted? O A. Ho: p= 0.5 O B. Ho: p0.5 H1: p = 0.5 O C. Ho: p= 0.5 O D. Ho: p= 0.5 H,: p#0.5 H:p0.5 H:p= 0.5 H1: p= 0.5 What is the test statistic? Z= (Round to two decimal places as needed.) What is the P-value? P-value = (Round to three decimal places as needed.) What is the conclusion about the null hypothesis? O A. Fail to reject the null hypothesis because the P-value is greater than the significance level, a. O B. Reject the null hypothesis because the P-value is less than or equal to the significance level, a. O C. Fail to reject the null hypothesis because the P-value is less than or equal to the significance level, a. O D. Reject the null hypothesis because the P-value is greater than the…
1. The accompanying data on degree of spirituality for a random sample of natural scientists and a random sample of social scientists working at research universities appeared in a paper. Is there evidence that the spirituality category proportions are not the same for natural and social scientists? Test the relevant hypotheses using a significance level of ? = 0.01. Degree of Spirituality Very Moderate Slightly Not at All Natural Scientists 56 160 195 215 Social Scientists 56 220 244 239 State the appropriate null and alternative hypotheses. A) H0: The spirituality category proportions are the same for natural scientists and social scientists. Ha: The spirituality category proportions are not the same for natural scientists and social scientists. B) H0: The spirituality category proportions are not the same for natural scientists and social scientists.Ha: The spirituality category proportions are the same for natural scientists and social scientists. C) H0:…
The accompanying table shows results of challenged referee calls in a major tennis tournament. Use a 0.05 significance level to test the claim that the gender of the tennis player is independent of whether a call is overturned. Was the Challenge to the Call Successful? Yes No Men 365 699 Women 474 749 Determine the null and alternative hypotheses. A. H0: Male tennis players are more successful in overturning calls than female players. H1: Male tennis players are not more successful in overturning calls than female players. B. H0: Male tennis players are not more successful in overturning calls than female players. H1: Male tennis players are more successful in overturning calls than female players. C. H0: The gender of the tennis player is independent of whether a call is overturned. H1: The gender of the tennis player is not…
Researchers collected data on the numbers of hospital admissions resulting from motor vehicle crashes, and results are given below for Fridays on the 6th of a month and Fridays on the following 13th of the same month. Use a 0.05 significance level to test the claim that when the 13th day of a month falls on a Friday, the numbers of hospital admissions from motor vehicle crashes are not affected. Friday the 6th: Friday the 13th: 10 14 7 13 What are the hypotheses for this test? Let Hd be the mean of the differences Ho: Hd = 0 H₁: Hd 0 11 14 11 10 4 6 Find the value of the test statistic. t= -2.860 (Round to three decimal places as needed.) 50 13 in the numbers of hospital admissions resulting from motor vehicle crashes for the population of all pairs of data. Identify the critical value(s). Select the correct choice below and fill the answer box within your choice. (Round to three decimal places as needed.) OA. The critical values are t = t OB. The critical value is t =
Suppose we are interested in the relationship between individuals’ place of residence (rural versus urban) and their political affiliation (Republican versus Democrat). A random sample of 100 individuals yields the following crosstabulation: Political Affiliation Place of Residence Republican Democrat Rural 21 29 Urban 14 36 a) In words, what is the null hypothesis to be tested? b) Is the relationship between place of residence and political affiliation statistically significant at the .05 level? (Be sure to show the statistics that lead to your decision.) c) Compute and interpret an appropriate measure of association for the relationship between these two variables.
A police department released the numbers of calls for the different days of the week during the month of October, as shown in the table to the right. Use a 0.01 significance level to test the claim that the different days of the week have the same frequencies of police calls. What is the fundamental error with this analysis? Day Sun Mon Tues Wed Thurs Fri Sat Frequency 154 204 223 241 176 209 240 Determine the null and alternative hypotheses. Но H1: Calculate the test statistic, y?. x2 = (Round to three decimal places as needed.) Calculate the P-value. P-value =| |(Round to four decimal places as needed.) Click to select vour answer(s)