6. What type of car is more popular among University students, South African orforeign? One hundred fifty-nine college students were randomly sampled and eachI was asked which type of car he or she prefers. A computer package was used togenerate the printout below for the proportion of college students who preferAmerican automobiles.SAMPLE PROPORTION=SAMPLE SIZEUPPER LIMITLOWER LIMIT==0.3962261590.464920.331153Is the sample large enough for the interval to be valid?(a) Yes, since n > 30.(b) No, the population of college students is not normally distributed.(c) Yes, since np and nâ are both greater than 15.(d) No, the sample size should be at 5% of the population.

Given that p^ = 0.396226 , n = 159 , Lower limit = 0.331153 , Upper limit = 0.46492 q^ = 1 - p^ =…

Answered: Is the sample large enough for the…

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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Please help. I’m trying to complete these problems as review and they’re stumping me. No code please just math
One consumer wants to know if the average number of chips is less than 45 in a bag of Red Bird potato chips. A random sample of 100 was selected and the sample statistics werex=41.6 and s = 7.6. (i) What is the standard error of x? (ii) Using one or two sentences, briefly describe the Central Limit Theorem (CLT) for the sample mean. (ii) Does CLT hold for this test? Explain your reasoning. (iv) State the hypotheses for the test. (v) Give a 90% CI (3 d.p.) for the average amount of chips in each bag (The margin of error is 1.262). (vi) Interpret your Cl in part (iv) in context. (vii) Make a decision and conclusion based on your Cl in part (v).
At an art store, the mean sale amount is $1250 per customer. The owner thinks that the mean sales amount increases during promotion. A random sample of 45 paintings purchased during a promotion was selected, the sample mean sales amount is x¯=1315. Assume σ=$155. How can I implement the hypothesis test to check if the mean sales amount increases during promotion, and let α=0.01. I want to solve by both P-value method and reject region method.
When using an independent samples t-test, the author of a journal article reported that t(30) = 3.60, p < .05. Should the researcher reject the null or fail to reject the null?
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A previous study showed to determine whether a sales tax on soda will reduce consumption of soda in the US below the current per-capita level of about 50 gallons of soda per year. Hypotheses Test is Ho: m(mue) =50 vs. Ha: m<50 where m (mue) represents the average annual consumption of soda in communities where the sales tax is implemented. (b) Now supposed sample results give a p-value of 0.41. Interpret this p-value in terms of random chance and in the context of taxes and soda consumption.
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Is the sample large enough for the interval to be valid? (a) Yes, since n > 30. (b) No, the population of college students is not normally distributed. (c) Yes, since np and nq are both greater than 15. (d) No, the sample size should be at 5% of the population.