help question 15 Question 15>A well-known brokerage firm executive claimed that 90% of investors are currently confident of meeting theirinvestment goals. An XYZ Investor Optimism Survey, conducted over a two week period, found that in a sampleof 600 people, 570 of them said they are confident of meeting their goals.Test the claim that the proportion of people who are confident is larger than 90% at the 0.01 significancelevel.The null and alternative hypothesis would be:Ho:P0.9 Но: и 3 0.9 Но:р—D 0.9 Но:рH1:p < 0.9 H1:µ < 0.9 H1: µ > 0.9 H1:p 7 0.9 H1: µ + 0.9 H1:p > 0.90.9 Но:и 3 0.9 Но:р — 0.9The test is:two-tailed right-tailed left-tailedThe test statistic is:(to 3 decimals)The p-value is:(to 4 decimals)Based on this we:Fail to reject the null hypothesisReject the null hypothesis

Answered: Image /qna-images/answer/fe00abad-938f-489a-827c-03d09d70509e.jpg

Answered: A well-known brokerage firm executive…

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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Question #4. US Universities found that 72% of people are concerned about the possibility that their personal records could be stolen over the Internet. If a random sample of 300 college students at a Midwestern university were taken and 228 of them were concerned about the possibility that their personal records could be stolen over the Internet, could you conclude at the 0.025 level of significance that a higher proportion of the university's college students are concerned about Internet theft than the public at large? Report the p-value for this test. Z0.025 = 1.96
Question 10 Political Science, Inc. (PSI) specializes in voter polls and surveys designed to keep political office seekers informed of their position in a race. Using telephone surveys, interviewers ask registered voters who they would vote for if the election were held that day. In a recent election campaign, PSI found that 220 registered voters, out of 500 contacted, favored a particular candidate. a. Develop a 95% confidence interval estimate for the proportion of the population of registered voters that favors the candidate.b. Suppose that PSI would like 99% confidence that the sample proportion is within ± .03 of the population proportion. What sample size is needed to provide the desired margin of error?
QUESTION 14 A general manager of the Mega Mart supermarket chain is studying the method of payment used by the customers at two of its city stores. At the chain’s downtown store last week, a sample of 400 patrons was randomly selected, and each patron’s method of payment was identified. Is there sufficient evidence to dispute the claim, using a 0.001 level of significance, that all methods of payment had an equal likelihood of occurrence? The multinomial sample results were as follows: Payment Method Cash Check Credit Card Debit Card Food Stamps Observed Frequency 119 107 71 55 48 Given that all five methods of payment are claimed to have the same likelihood of occurrence, their respective hypothesized proportions are 20% or 0.20. Therefore, what is the expected value for each category?
QUESTION 14 A general manager of the Mega Mart supermarket chain is studying the method of payment used by the customers at two of its city stores. At the chain’s downtown store last week, a sample of 400 patrons was randomly selected, and each patron’s method of payment was identified. Is there sufficient evidence to dispute the claim, using a 0.001 level of significance, that all methods of payment had an equal likelihood of occurrence? The multinomial sample results were as follows: Payment Method Cash Check Credit Card Debit Card Food Stamps Observed Frequency 119 107 71 55 48 Given that all five methods of payment are claimed to have the same likelihood of occurrence, their respective hypothesized proportions are 20% or 0.20.
Question 1For the following scenarios provide the following for each scenario:• the null and alternative hypotheses• explain whether the hypothesis test is left-tailed, right-tailed, or two-tailed, • explain how you should interpret a decision that rejects the null hypothesis, and • explain how you should interpret a decision that fails to reject the null hypothesis. a. A Don Anderson Poll reports that on average 70% of Jamaicans believe that electricitybills are too high. b. Sunshine Cooperation guarantees that the mean shelf life of cornflakes is at least 750 days. c. Consumer Affairs has advised that the standard deviation of the fuel economies of its Honda Civics for 2016 is no more than 10.7 miles per gallon.d. A meal supplement provider claims that the average difference in calories between two brands is 55.
QUESTION 11 If a hypothesis test with a significance level of \alpha rejects H0: \ mu 1 = \mu 2 in favor of Ha: \mu 1!= \mu 2, then the corresponding (1-\alpha) % confidence interval for (\mu 1 \mu 2) does not contain zero. Training False True
Question 19: "Trydint" bubble-gum company claims that 3 out of 10 people prefer their gum to "Eklypse". Test their claim at the 99 confidence level.The null and alternative hypothesis in symbols would be: H0:p≤0.3H0:p≤0.3H1:p>0.3H1:p>0.3 H0:μ=0.3H0:μ=0.3H1:μ≠0.3H1:μ≠0.3 H0:μ≤0.3H0:μ≤0.3H1:μ>0.3H1:μ>0.3 H0:p≥0.3H0:p≥0.3H1:p<0.3H1:p<0.3 H0:μ≥0.3H0:μ≥0.3H1:μ<0.3H1:μ<0.3 H0:p=0.3H0:p=0.3H1:p≠0.3H1:p≠0.3 The null hypothesis in words would be: The proportion of all people that prefer Trydint gum is 0.3 The proportion of all people that prefer Trydint gum is less than 0.3. The average of people that prefer Trydint gum is not 0.3. The average of people that prefer Trydint gum is 0.3. The proportion of all people that prefer Trydint gum is greater than 0.3. The proportion of people in a sample that prefers Trydint gum is 0.3. The proportion of people in a sample that prefer Trydint gum is not 0.3 Based on a sample of 50 people, 5 said they prefer "Trydint" gum…
Question 16: Test the claim that the proportion of people who own cats is larger than 50% at the 0.005 significance level.The null and alternative hypothesis would be: H0:μ=0.5H0:μ=0.5H1:μ≠0.5H1:μ≠0.5 H0:p≤0.5H0:p≤0.5H1:p>0.5H1:p>0.5 H0:μ≤0.5H0:μ≤0.5H1:μ>0.5H1:μ>0.5 H0:p=0.5H0:p=0.5H1:p≠0.5H1:p≠0.5 H0:μ≥0.5H0:μ≥0.5H1:μ<0.5H1:μ<0.5 H0:p≥0.5H0:p≥0.5H1:p<0.5H1:p<0.5 The test is: left-tailed right-tailed two-tailed Based on a sample of 200 people, 56% owned catsThe test statistic is: (to 2 decimals)The p-value is: (to 2 decimals)Based on this we: Fail to reject the null hypothesis Reject the null hypothesis
QUESTION IV [6]A courier service company has found that their delivery time of parcels to clients is approximatelynormally distributed with a mean delivery time of 30 minutes and a variance of 25 minutes (squared).Required:a) What is the probability that a randomly selected parcel will take more than 26 minutes todeliver? (2)b) What is the minimum delivery time (minutes) for the 2.5% of parcels with the longest time todeliver? (4
Question 12: Test the claim that the proportion of men who own cats is larger than 50% at the .005 significance level.The null and alternative hypothesis would be: H0:p=0.5H0:p=0.5H1:p≠0.5H1:p≠0.5 H0:μ=0.5H0:μ=0.5H1:μ>0.5H1:μ>0.5 H0:μ=0.5H0:μ=0.5H1:μ<0.5H1:μ<0.5 H0:μ=0.5H0:μ=0.5H1:μ≠0.5H1:μ≠0.5 H0:p=0.5H0:p=0.5H1:p<0.5H1:p<0.5 H0:p=0.5H0:p=0.5H1:p>0.5H1:p>0.5 The test is: left-tailed two-tailed right-tailed Based on a sample of 100 people, 53% owned catsThe test statistic is: (to 2 decimals)The critical value is: (to 2 decimals)Based on this we: Reject the null hypothesis Fail to reject the null hypothesis
question 1: What is the critical value for an upper‐tailed hypothesis test of the population mean when the population variance is unknown in which a null hypothesis is tested at the 0.01 level of significance based on a sample size of 22? Options 2.518 1.721 1.734 1.323 Question 2: The state lottery office claims that the average household income of those people playing the lottery is at least $37,000. Assume that the distribution of household income of those people playing the lottery is normally distributed with a standard deviation of $5,000. Suppose that for a sample of 16 households, it is found that the average income was $35,000. What is the test statistic for this test? Options t = ‐1.76 t = ‐0.96 t = -2.00 t = -1.60
Question 3. Two samples of sizes 15 and 16 are drawn from two normally distributed populations havingmeans of 16 and 11, respectively. If the sample variances are 6 and 5, determine whether the firstsample has a significantly lower variance than the second sample at a 0.025 significance level.

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