13. Companies are interested in the demographics of those who listen and call in to the radio programsthey sponsor. Suppose that only 20% of listeners phoning in to a morning talk show are male.(a) If the station takes a random sample of 200 callers, what is the probability that the sample proportionof males will be at least 0.25?(b) The station management wonders if adding a male host to the program will increase the proportion ofcallers who are male. After adding the male host, the station selects a random sample of 200 callers andfinds that 25% are male. Does this provide convincing evidence to suggest that the proportion of malecallers has increased from 20%? Explain.

From the provided information, 20% of listeners phoning in to a morning talk show are male that is p…

Answered: 13. Companies are interested in 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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6. A survey by Altgeld Travel Magazine found that 85% of airline passengers prefer to sleep during their flights. Ifwe randomly select 9 passengers, what is the probability that…. (a) Exactly 8 passengers prefer to sleep during their flights? (b) 8 or more passengers prefer to sleep during their flights?
4. The salaries of UConn professors is approximately normally distributed. Suppose you know that 33 percent of professors eam less than $80,000. Also 33 percent earn more than $120,000. (a) What is the probability that a UConn professor makes more than $100,000? (6) What is the probability that a UConn professor makes between $70,000 and $80,000?
I need help with this problem.
We believe that 95% of the population of all Elementary Statistics students consider Statistics an exciting subject. Suppose we randomly and independently selected 20 students from the population. If the true percentage is really 95% find the probability of observing 19 or more of the students who consider statistics to be an exciting subject in our sample of 20.
7. According to a college survey, 22% of all students work full time. In a survey of 14 students, what is the probability that no more than 2 of them work full time?
A recent study has shown that approximately 31.6% of Canadians are considered 'supertasters,' or people who experience the sense of taste with greater intensity than average. Consider a sample of 23 Canadians, each of whom are asked to indicate if they are a supertaster or not. Please use this information to answer the following questions.a. Suppose you know that at least 7 of the Canadians sampled are supertasters. What is the probability that exactly 15 of the Canadians sampled are supertasters?Answer:______________Round to at least FOUR digits after the decimal if necessary. b. What is the probability that the 10th Canadian sampled is the sixth person to indicate that they are a supertaster?Answer:______________Do NOT round your answer; give all the decimals.
(This is a introduction to statistics course) From past records, a department store finds that 70% of the people who enter the store will make a purchase on Black Friday. Suppose that 3 customers are randomly selected at the store, answer the following questions: 1) What is the chance that exactly one out of three customers make a purchase? Give your answer (%) rounded to one decimal place. (For example, if your answer is 0.5125 (51.25%), then it will be 51.3% after being rounded to one decimal place.) 2) Explain clearly.
Suppose a math class contains 37 students. There are 19 females (six of whom speak Spanish) and 18 males (five of whom speak Spanish). Give all answers as decimals to at least two decimal places.1. What is the probability that a randomly selected student speaks Spanish, given that the student is female? 2. What is the probability that a randomly selected student does not speak Spanish, given that the student is male? 3. What percent of Spanish speaking students are male? 4. If someone does not speak Spanish what is the probability they are female?
A class president is favored by 53% of all students voting, assuming this is accurate, a random sample of 400 students are surveyed. 1. What is the probability that less than 49% will favor this student? 2. What is the probability that more than 57% will favor the student?
5.Approximately 64% of the people murdered actually knew their murderer. Given 63 current unsolved murders, what is the probability that at least (equal to and more than) 35 victims knew their murderer?
12. A survey conducted discovered that 63% of all Americans are overweight. Suppose that a number of randomly selected Americans are weighed. The following table may (or may not) be useful: k 0 1 2 3 4 1 4 6 4 1 4Ck (a) Find the probability that the 4th person weighed is the first person to be overweight. (b) Find the probability that it takes less than 4 people to observe the first overweight person. (c) Find the expected value and variance of the number of Americans that would have to be weighed in order to find the first person that was overweight.

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