Problem #2: Suppose it is known that p = 24% of a certain kind of scratch tickets are winners. In a random sample of 107such tickets, 38 are found to be winners.Problem #2(a):Problem #2(b):(a) What is the sample proportion of winners, p?(b) What is the standard error of p?answer correct to 4 decimalsanswer correct to 4 decimals

Answered: Problem #2: Suppose it is known that p…

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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Three-circle, red-on-white is one distinctive pattern painted on ceramic vessels of the Anasazi period found at an archaeological site. At one excavation, a sample of 175 potsherds indicated that 66 were of the three-circle, red-on-white pattern. (a) Find a point estimate p̂ for the proportion of all ceramic potsherds at this site that are of the three-circle, red-on-white pattern. (Round your answer to four decimal places.)(b) Compute a 95% confidence interval for the population proportion p of all ceramic potsherds with this distinctive pattern found at the site. (Round your answers to three decimal places.) lower limit upper limit
Suppose it is generally accepted that 40% of consumers use Apple products. You believe that the percentage is greater. You take a sample of 600 consumers and find that 270 of them use Apple products. Based on our sample, if we repeated this sampling procedure an infinite number of times, 95% of the sample proportions would be between which of the following two numbers?
Example 17: In a sample of 1000 citizens of India, 540 are wheat eaters and the rest are rice eaters. Can we assume that both rice and wheat are equally popular in India at a%. level of significance?
Three-circle, red-on-white is one distinctive pattern painted on ceramic vessels of the Anasazi period found at an archaeological site. At one excavation, a sample of 181 potsherds indicated that 64 were of the three-circle, red-on-white pattern. (a) Find a point estimate p̂ for the proportion of all ceramic potsherds at this site that are of the three-circle, red-on-white pattern. (Round your answer to four decimal places.)(b) Compute a 95% confidence interval for the population proportion p of all ceramic potsherds with this distinctive pattern found at the site. (Round your answers to three decimal places.) lower limit upper limit
2. In a population it is estimated that 20% have a desired trait of interest for the researcher. The researcher wants to know how many people on average he has to draw from a population to get 2 people with the trait. Use rows 20-24 of the Random Number Table to carry out the simulation. Explain clearly how you set up the problem and report your findings. Answer:
(A5) In a certain study of 900 men from Nsawam, it was found that 25 are smokers. Use (a) Identify the population in this study. (b) What is the sample size? (c) What percentage of the sampled population are smokers? (d) State the gender of interest in the study. Men (e) What question is the researcher most likely to ask in this study? d 2 doctors An executive
Three-circle, red-on-white is one distinctive pattern painted on ceramic vessels of the Anasazi period found at an archaeological site. At one excavation, a sample of 179 potsherds indicated that 62 were of the three-circle, red-on-white pattern. (a) Find a point estimate p̂ for the proportion of all ceramic potsherds at this site that are of the three-circle, red-on-white pattern. (Round your answer to four decimal places.)
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Suppose you want to decrease the margin of error by a factor of 5-for example, from 15% to 3%. By what factor must you increase the sample size? The sample size must be (Type a whole number.) times as great.
Question 23 Read and solve the problem; choose the best answer from the choices provided. At a college there are 120 freshmen, 90 sophomores, 110 juniors, and 80 seniors. A school administrator selects a simple random sample of 12 of the freshmen, a simple random sample of 9 of the sophomores, a simple random sample of 11 of the juniors, and a simple random sample of 8 of the seniors. She then interviews all the students selected. Your answer: O Systematic random sampling o Convenience sampling Stratified sampling Cluster sampling
3. At a factory that produces doorknobs, a batch of 1500 doorknobs has just been produced. To check the quality of the doorknobs, a random sample of 100 doorknobs is selected to test for defects. Out of these 100 doorknobs, 2 were found to be defective. Based on these results, what is the best estimate you can give for the number of defective doorknobs in the batch of 1500? Solve this problem in two different ways, explaining your reasoning in each case. just been
"A manufacturer of shampoo claims that 72% of the shampoo users prefer brand X. To test this claim, a random sample of 44 participants are selected and asked what brand they prefer. If 31 of the 44 participants prefer brand X, what conclusion do we draw? Use a 0.1 level of significance. What are the given? hypothesized proportion:Blank 1% sample proportion:Blank 2 (Write your answer in fraction form form and simplify your answer) sample size:Blank 3 level of significance:Blank 4 What are the critical values? Write the positve first then the negative z:Blank 5 andBlank 6 What is the calculated z? Round your answer to the nearest hundredths. z:Blank 7"

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