A soap manufacturer wanted to know that percentage of the citizens of Sri Lanka use his product. He conduct a sample survey and found that out of 400 persons selected at random only 60 persons use this soap. He spends one hundred thousand rupees on an advertising campaign to attract more customers. In order to know the result of his campaign, he conducted another survey of 500 persons selected at random and found that 125 persons of them use his product after the campaign. Do you thing that the advertisement campaign has really increased the percentage of the citizen of Sri Lankan using his product? Justify your answer using 95% confidence interval.

Q: Joe likes to go to an old arcade and play 12 games of Skeeball every day. On​ average, he wins a…

A: In this context, there are fixed number of trials. That is, n = 12. There are two possible outcomes…

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A: Given, Lorena took a survey of the students in her honors science class to determine how many are…

Q: A multiple-choice exam consists of 10 questions, each having 5 possible answers. To pass, you must…

A: Here, n = 10 and p = 15. 1. The probability is, The probability is 0.0064.

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A: Given : n=20 , μ0=250 , α=0.05 From the given sample data : The sample mean is , X¯=∑Xn=225.8 The…

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A:

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A: According to the provided information, p=0.60

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A: Answer:----.                 Date:----9/10/2021

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A: Given: Age 31 27 30 25 21 27 32 23 30 24 24 28 25 23 22 24 24…

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Q: ccording to the pew research Center 42% of Americans so that they are spending less money than usual…

A: p =0.42 n = 1000

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A: Solution: From the given information, p=28.5%=0.285, Confidence level is 0.95 and E=0.035.

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A:

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Q: (b) dogs are cuter than cats differs between genders. In the same survey, he found additional…

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A: We have to conclude about a survey.

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A:

Q: Consider the students in your statistics class as the population and suppose they are seated in four…

A: Students in the statistics class are seated in 4 rows, each row with 10 students.  Let the rows be…

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Q: Last year, 41% of business owners gave a holiday gift to their employees. A survey of business…

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A: There are two machines Define the Events, A : The machine is faulty  B : The the product contains no…

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A: Disclaimer: Since you have asked multiple questions, we will solve the first question for you. If…

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Q: Lorena took a survey of the students in her honors science class to determine how many are going to…

A: Lorena took a survey of the students in her honors science class to determine how many are going to…

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Q: Suppose a biology student is about to take an exam that is entirely multiple choice, where each…

A: Note : You have posted multiple questions, as per guidelines I am answering only first question. If…

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Q: A student is taking an exam and doesn't know the answers to 3 of the questions, so they decide to…

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A:

Q: According to Inc.com, 71% of job seekers used social media in their job search in 2018. Many believe…

A: The answer is given in the below image. Please let me know if there something needs to be added.

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Q: A lawn mower company will produce 1,500 lawn mowers by 2020. In an effort to determine how much…

A: Given, N = 1500 n =  187  x= 5.3 µ = ? σ = 1.28 years Sample size 187 > 5% of the population…

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Q: Consider the students in your statistics class as the population and suppose they are seated in four…

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Q: Two scanners, Brand A and Brand B,  are both designed to detect forged cinema tickets. To determine…

A: The provided information is n1=300n2=300x1=97x2=178α=0.05The proportion is…

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A: Given information: The data represents the values of the number of claims and errors.

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A:

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.