The owner of a small deli is trying to decide whether to discontinue selling magazines. He suspectsthat only 7.9% of his customers buy a magazine and he thinks that he might be able to use thedisplay space to sell something more profitable. Before making a final decision, he decides that forone day he will keep track of the number of customers that buy a magazine.(a) Explain why this is a binomial experiment.(b) Assuming his suspicion that 7.9% of his customers buy a magazine is correct, what is theprobability that exactly 4 out of the first 10 customers buy a magazine? Give your answer as adecimal number rounded to two digits.(c) What is the expected number of customers from this sample that wil buy a magazine?

If each trial has only two possible outcomes, that is, success and failure, the probabilities of…

Answered: The owner of a small deli is trying to…

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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A biologist wishes to study the effect of the pollinating number of insects on yields of dates on a large dates farm located in the governorate of Musandam. Using your statistics knowledge, you propose to her that for better inferential statistics she should use systematic random sampling to select a sample of 100 date trees from the 2000 date trees in the farm. Which of the following is true? Select one: O a. The population is 100 date trees selected from the farm O b. Systematic sampling is a convenient sampling method O c. The sampling size will be 20 O d. Systematic sampling is obtained by taking every pth element from the population
A researcher claims that exactly 40% of all adults in the U.S. use their cell phone for most of their online browsing. You believe that the true proportion is different. To test this, you take a simple random sample of 200 adults in the U.S and find that 44% of them use their phone for most of their online browsing. Test at 5% significance. Round to the fourth as needed What's the minimum population size required? How many successes were there? Ho: Select an answer V Select an answer v HA: Select an answer V Select an answer V Test Statistic: P-value: Did something significant happen? Select an answer Select the Decision Rule: Select an answer There Select an answer v enough evidence to conclude Select an answer Build a 95% confidence interval and decide if you can conclude the same. Use your calculator to do this and round to the fourth decimal place. Can we conclude the same as our Hypothesis Test? v because the true proportion of U.S. adults that use their cell phones for most of…
Q (2): Identify each of the following studies as either descriptive statistics or statistical inference: a. Examine the weights of a sample of 25 manufacturer parts to see if the average weight of all the parts produced by the process is 3 pounds. b. Post the average final score for the statistics class. c. Estimate the percentage of the US population that will vote for George W. Bush in the next presidential election. d. Select a random sample of 50 babies born in 2000 and estimate the birth weight of all babies born during the same year. e. Examine the weights of a sample of 10 candy bars to see if their average weight is 6 ounces.
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?
Polling 2004. In the 2004 U.S. presidential election,the official results showed that George W. Bush received50.7% of the vote and John Kerry received 48.3%. RalphNader, running as a third-party candidate, picked uponly 0.4%. After the election, there was much discussionabout exit polls, which had initially indicated a differentresult. Suppose you had taken a random sample of 1000voters in an exit poll and asked them for whom they hadvoted.a) Would you always get 507 votes for Bush and 483 forKerry? b) In 95% of such polls, your sample proportion of vot-ers for Bush should be between what two values? c) In 95% of such polls, your sample proportion of vot-ers for Nader should be between what two numbers? d) Would you expect the sample proportion of Nadervotes to vary more, less, or about the same as thesample proportion of Bush votes? Why?
[9] Two researchers conducted studies about vaccination hesitancy rates of adults in the entire Philippines. The first researcher found out that 12% of his respondents were hesitant and will never allow to be vaccinated. The second researcher found 9%. Assuming both followed proper sampling procedures and did their calculations correctly, what would be the likely explanation/s for this discrepancy? Provide 3 (three) explanations:
Part 2
Suppose that 67% of voters in a state oppose concealed carry handguns. Repeated random samples of 400 voters were collected. Use the Empirical Rule to find the interval in which the sample proportion of opponents should fall 95% of the time. Select one: A. (64.6%,69.4%)(64.6%,69.4%) B. (63.8%,70.2%)(63.8%,70.2%) C. (60.7%,73.3%)(60.7%,73.3%) D. (61.5%,72.5%)(61.5%,72.5%) E. None of the above
R3.25. Timing In August 2011, a Sodahead.com voluntary response poll asked site visitors, "Obama is on Vacation Again: Does He Have the Worst Timing Ever?" 56% of the 629 votes were for "Yes." During the week of the poll, a 5.8 earthquake struck near Washington, D.C., and Hurricane Irene made its way up the East Coast. What types of bias may be present in the results of the poll?
Write about the role of box-and-plots in statistical random experiments. The double whisker plots of the homework time (in minutes) per night with TV time per night of the same group of the students are: a) What percent of the students work on homework for at least 48 minutes per night? b) What percent of the students watch TV for at least 15minutes per night? c) Is it more common for the students at this university to spend more than 1 hour on homework and more than 1 hour on watching TV also? Explain.
(6) A student surveys some students on campus in the evening and finds that 16 out of 20 of the students she interviewed are part time students. She uses the data to estimate the percentage of all students who are part time. What type of bias is present in her sample?
Part 2

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