Current Attempt in ProgressFind the expected counts in each category using the given sample size and null hypothesis.Ho: P₁ = 0.4, P₂ = 0.1, P3 = 0.25, P4 = 0.25; n = 400Enter the exact answers.CategoryExpectedcounteTextbook and MediaHintSave for Later12i3iAttempts: unlimited4Submit Answer

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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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Online customer service is a key element to successful online retailing. According to a marketing survey, 30% of online customers take advantage of the online customer service. Assume the population proportion of those who use online customer service is 0.30. Random samples of 100 customers are selected. 95% of the sample proportions centered symmetrically about the sampling distribution mean will be between _________________ and _________________.
A fitness trainer is interested in investigating whether ethnicity and the first exercise activity that members engage in are dependent. The table below shows the results of the trainer's observation of randomly selected members. Frequencies of Ethnicity and Exercise Activity Weight Machines White Hispanic Black Other Cardio 84 84 68 48 98 97 51 70 O Homogeneity O Independence Free Weights 81 98 69 41 What can be concluded at the α = 0.05 significance level? a. What is the correct statistical test to use? O Goodness-of-Fit Paired t-test b. What are the null and alternative hypotheses? Ho: O Ethnicity and first exercise activity are dependent. O Ethnicity and first exercise activity are independent. O The distribution of first exercise activity is not the same for each ethnicity. O The distribution of first exercise activity is the same for each ethnicity. H₁: O The distribution of first exercise activity is the same for each ethnicity. O Ethnicity and first exercise activity are…
Scenario: 200 people were asked, “Who is your favorite superhero?” Below are the data. Test the null hypothesis that the population frequencies for each category are equal. α= .05. Iron Man Black Panther Wonder Woman Spiderman fo = 40 fo = 60 fo =55 fo = 45 fe = fe = fe = fe = The expected frequency, fe = ____
Find the expected counts in each category using the given sample size and null hypothesis. Ho: P₁ P₂ = P3 = P4 = 0.25; n Enter the exact answers. Category Expected count 1 2 = 700 3 i 4
44 randomly selected students were asked how many siblings were in their family. Let X represent the number of pairs of siblings in the student's family. The results are as follows: # of Siblings Frequency 1 2 3 4 6 11 7 5 3 7 Round all your answers to 4 decimal places where possible. The mean is: The median is: The sample standard deviation is: The first quartile is: The third quartile is: What percent of the respondents have at least 4 siblings? 66% of all respondents have fewer than how many siblings?
In a survey of 175 females who recently completed high school, 76% were enrolled in college. In a survey of 150 males who recently completed high school, 72% were enrolled in college. At a = 0.05, can you reject the claim that there is no difference in the proportion of college enrollees between the two groups? Assume the random samples are independent. Complete parts (a) through (e). O A. Ho: P1 #P2 Ha: P1 = P2 O B. Ho: P1 P2 OF. Ho: P1 = P2 O D. Ho: P1 > P2 Ha: P1 SP2 Ha: P1 O B. z 1.96 O D.
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II. Supply the table with the corresponding random variable and/or the possible values of the random variable for each experiment. Possible values (x) for the Experiment Random Variable (X) Random Variable Number of customers who 1. Contacting 10 customers 0, 1, 2, 3, 4,5 placed a complaint 2. Inspection of shipment of 100 laptops 3. Filling a bottle of water (maximum of 500 mL) 0, 1,2, .,99, 100 0sxs 500 The temperature when the desired reaction takes place (minimum of 40°C; maximum of 90* C) 4. Testing of new chemical process 5. Selling an automobile O if male; 1 if female
A bank manager is interested in if the mean time it takes for customers to be served at their branch is 8 minutes. Having taken a random sample of customer waiting times, the manager performs a hypothesis test and finds a p-value of 0.03. At the 5% significance level, the conclusion of the test will be: A. B. C. D. E. As only the p-value is provided, there is not enough information to be able to decide whether to reject or not reject the null hypothesis at the 5% significance level. The results suggest that, at the 5% significance level, the population mean waiting time is not 8 minutes. The results suggest that, at the 5% significance level, the population mean waiting time is in fact 0.03 minutes. The results suggest that, at the 5% significance level, the manager is unable to reject the null hypothesis, that the population mean waiting time is 8 minutes. None of the above. The mean represents: A. the arithmetic average of a data distribution B. the degree of kurtosis C. the most…
The sample data below represent the number of late and on time flights for three airlines. Flight Late 1 Airline 2 3 81 93 98 On Time 219 207 302 (a) Formulate the hypotheses for a test that will determine if the population proportion of late flights is the same for all three airlines. P₂ P3 O Ho: Not all population proportions are equal. Ha: P₁ = P₂ = P3 Ho: P₁ = P₂ = P3 H: Not all population proportions are equal. O Ho: All population proportions are not equal. Ha: P₁ = P₂ = P3 O Ho: P₁ = P₂ = P3 H: All population proportions are not equal. (b) Conduct the hypothesis test with a 0.05 level of significance. Find the value of the test statistic. (Round your answer to three decimal places.) Find the p-value. (Round your answer to four decimal places.) p-value = Need Help? Read It State your conclusion. Reject H. We cannot conclude that not all of the population proportions are equal. O Do not reject Ho. We conclude that not all of the population proportions are equal. O Reject H. We…
A survey is conducted to determine if there is a difference in the proportion of students, parents, and teachers who volunteer at least once a month. To investigate, a random sample of 45 students, 25 parents, and 12 teachers was selected from a large high school. The data are displayed in the tables. Observed counts: Expected counts: The researcher would like to test these hypotheses: H0: There is no difference in the distribution of responses among these three populations.Ha: There is a difference in the distribution of responses among these three populations. The conditions for inference are met. What is the value of the chi-square test statistic and what are the degrees of freedom for this test? χ‑2 = 0.19, df = 2χ‑2 = 0.19, df = 5χ‑2 = 0.44, df = 2χ‑2 = 0.44, df = 5

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Find the expected counts in each category using the given sample size and null hypothesis. Ho: P₁ = 0.4, P2 = 0.1, P3 = 0.25, P4 = 0.25; n = 400 Enter the exact answers. Category Expected count i 1 |i 2 i 3 4