Step 2 of 2: Interpret this and decide to reject/fail to reject? Is there sufficient or insufficient evidence? A researcher believes there is a difference in the mean number of days before visible results begin to show among three types of facial creams that reduce wrinkle lines.Several consumers are randomly selected and given one of the three creams. Each participant then recorded the number of days it took to see results. The results areshown in the table. Based on these data, can you conclude that there is a difference between the mean number of days for these three creams? Use a 0.05 level ofsignificance and assume the population distributions are approximately normal with equal population variances.Cream #11410111212Cream #21111112011Cream #3161715211914Copy DataStep 1 of 2: Compute the value of the test statistic. Round any intermediate calculations to at least six decimal places, and round your final answer to four decimalplaces.

Solution: Given information: k= 3 groups . Group 1 and Group 2 has 5 replicates or observation and…

Answered: researcher believes there is a…

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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Test Conduct a hypothesis test for the following problem: A medical researcher says that at least 20% of US adults are smokers. In a random sample of 200 uS adults, 18.5% say that they are smokers. At a =0.01 significance level, is there enough evidence to reject the researcher's claim? Ho: 0.20 p> 0.20 p 0.20 Claim: Select an answer What is the level of significance given in this problem? What is the critical value for this sample? What is the test statistic for this sample? What is the rejection region for this sample?
Is there a difference in the car brand's countries for Midwesterners and people from the west coast? Of the 193 randomly selected Midwesterners surveyed 60 had an American car, 110 had a car from Asia, and 23 had a cars from another country. Of the 151 randomly selected people from the west coast who were surveyed, 45 had an American car, 74 had a car from Asia, and 32 had a car from outside of the US and Asia. Conduct the appropriate hypothesis test using an a = 0.10 level of significance. a. What is the correct statistical test to use? O Homogeneity O Independence O Goodness-of-Fit O Paired t-test b. What are the null and alternative hypotheses? Ho: O The distribution of car brand's countries is not the same for Midwesterners and people from the west coast. Address and car brand's countries are independent. O The distribution of car brand's countries is the same for Midwesterners and people from the west coast. O Address and car brand's countries are dependent. H1: O Address and car…
Are the conditions for inference met?
Management of a company that produces a medical device has carefully selected and screened 220 finished items (packaged, ready to ship). The team agrees that the sample contains 33 defective items, all for various visual defects on the package such as crooked labels, poor seal, errant marks on package, etc. The items are then given to an inspector for classification into “defective” and “non-defective” piles. The inspector ends up rejecting 9 non-defective items, and accepting 11 defective items. The inspector classifies the remaining items in the sample correctly. Find the following (answer as a probability, NOT a percentage. Use 2 decimal places: P(inspector accepts the item and its actually defective) =
" The Higher Education Research Institute at UCLA collected data from 203,967 incoming first-time, full-time freshmen from 270 four-year colleges and universities in the U.S. 71.4% of those students replied that, yes, they believe that same-sex couples should have the right to legal marital status. Suppose that you randomly pick eight first-time, full-time freshmen from the survey. You are interested in the number that believes that same-sex couples should have the right to legal marital status"I need help constructing the probability distribution function (PDF). (I need to round the probabilities to five decimal places.) x P(x) 0 1 2 3 4 5 6 7 8
In a survey of 1000 randomly selected adults in the United States, participants were asked what their most favorite and what their least favorite subject was when they were in school (Associated Press, August 17, 2005). In what might seem like a contradiction, math was chosen more often than any other subject in both categories! Math was chosen by 232 of the 1000 as the favorite subject, and it was also chosen by 366 of the 1000 as the least favorite subject. In USE SALT (a) Construct a 95% confidence interval for the proportion of U.S. adults for whom math was the favorite subject in school. (Give the answers to three decimal places.) (b) Construct a 95% confidence interval for the proportion of U.S. adults for whom math was the least favorite subject. (Give the answers to three decimal places.)
Is there a difference in the car brand's countries for Midwesterners and people from the west coast? Of the 170 randomly selected Midwesterners surveyed 50 had an American car, 100 had a car from Asia, and 20 had a cars from another country. Of the 159 randomly selected people from the west coast who were surveyed, 44 had an American car, 81 had a car from Asia, and 34 had a car from outside of the US and Asia. Conduct the appropriate hypothesis test using an αα = 0.05 level of significance. What is the correct statistical test to use? Goodness-of-Fit Independence Paired t-test Homogeneity What are the null and alternative hypotheses?H0:H0: Address and car brand's countries are dependent. The distribution of car brand's countries is not the same for Midwesterners and people from the west coast. Address and car brand's countries are independent. The distribution of car brand's countries is the same for Midwesterners and people from the west coast. H1:H1: The distribution…
5. In 2006, tenis introduced a challenge system in which a player can challenge a decision as to whether a tennis ball was correctly called 'in’ or ´ouť by an official. In the 2015 U.S. Open Tennis Championship there were a total of 850 player challenges between both the Men's and Women's Singles matches. These challenges were determined either to be correct (meaning the player was correct and the umpire was incorrect) or incorrect (meaning the player was incorrect and the umpire was correct). These 850 challenges are summarized in the table below. Player Challenge Men's Women's Correct 153 72 Incorrect 394 231 (a) Calculate the proportion of all challenges that were determined to be correct. (b) Using these data as a representative sample of all player challenges in professional tennis, a 95% confidence interval for the difference in the proportion of men's and women's challenges that are determined to be correct (men – women) was found to be 0.04 ± 0.06. All conditions for inference…
a bag contains 8 blue chips, 5 red chips, and 4 white chips. if two chosen at a random, what is the probabilitiy they will both be white?
Cars and trucks We have data on the city and highwayfuel efficiency of 316 cars and 316 trucks.a) Would it be appropriate to use paired t methods tocompare the cars and the trucks?b) Would it be appropriate to use paired t methods tocompare the city and highway fuel efficiencies ofthese vehicles?c) A histogram of the differences (highway – city) isshown. Are the conditions for inference satisfied?
According to a study, approximately 60% of US adults believe that they have achieved, or are within reach of, the "American Dream" (that is, home ownership and financial stability). Now consider a random sample of 400 US adults. What is the probablity that over 65% of the sampled adults believe they have reached or are optimistic about reaching the American Dream? NEED ANSWER! No explanattion please
16% of workers got their job through internet resume sites. Express the null and alternative hypotheses in symbolic form for this claim (enter as a percentage).

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