Researchers want to test the effectiveness of a new antidepressant medication. In clinical testing, 123 out of 220 people taking the medication reported improvement in symptoms of depression. Of the people receiving a placebo, 87 out of 230 reported improvement in symptoms of depression after treatment. The researchers want to test to see if the new antidepressant medication is working more effectively than the placebo. (b) Calculate the sample proportions p̂1 and p̂2. (Enter your answers as fractions.) p̂1 = p̂2 =

Q: If you want a poll to have a margin of error of 2.84%, how large will your sample have to be?

A:

Q: find the test value used to test the claim that the proportion of jellyfish stings at jones beach is…

A: Given, Sample size = 696 Sample proportion = 0.30   The null and alternative hypothesis is:

Q: In 2016 the Better Business Bureau settled 80% of complaints they received in the United States.…

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Q: You are testing the claim that the proportion of men who own cats is smaller than the proportion of…

A: we have given that  sample 1 = N1=50  and sample proportion 1 =p1^=20%=0.2 sample 2 = N2=110  and…

Q: Nationally, 83% of Americans have earned a high school diploma.  We want to see if the proportion of…

A: We have to find sample proportion.

Q: A consumer group surveyed 146 airplane travelers after a flight and found that 132 of them would fly…

A:

Q: A researcher wants to find out the number of students he needs to urvey in a school provided that…

A: Given : total no pf students in a school  N=5000 with margin of error e=5%  To find sample size…

Q: In a survey, 1000 respondents were asked about product preference. Of the interviewed, 65% favored a…

A:

Q: A magazine article conducted a survey of 807 people in Phoenix metro area and found that 45% of the…

A: Sample size (n) = 807 Population proportion (p) = 45% = 0.45 And  97% confidence interval is (41%,…

Q: Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches 49% of the…

A: Given:  Hypothesized population proportion  po= 49%=0.49 Sample size n=100  Sample proportion p=…

Q: A pharmaceutical company conducts a study where 50 patients are given a drug. They find that 10…

A: Sample is the subset of the population.

Q: Will, an art student, randomly sampled oil paintings in a museum. He wanted to find out how many oil…

A: Given :  Margin of Error  (E) = 0.02 The proportion of paintings that were created using the color…

Q: In a village actually invaded by anthrax, 65% of the gouts were attacked and 90% have been…

A:

Q: In 1942 ​, an organization surveyed 1100   adults and​ asked, "Are you a total abstainer​ from, or…

A: The proportion of considered subjects, on which we are interested from a sample can be termed as…

Q: The local school is conducting another survey to determine the proportion of students at the school…

A: Confidence interval is defined as the range that contains the value of the true population…

Q: In a comparison taste test of two juice drink 780 people preferred Cranberry Blast.Only 220 people…

A: In a comparison taste test of two juice drink 780 people preferred Cranberry Blast.Only 220 people…

Q: A programmer plans to develop a new software system. In planning for the operating system that he…

A: The margin of error (E) is 0.03 and the confidence level is 0.95.

Q: From the sample statistics, find the value of p1 - p2, the point estimate of the difference of the…

A: From the provided information,

Q: Suppose you take a sample of 25 Reese's pieces. The proportion of orange is 0.55. What is the…

A:

Q: s the newly hired manager of a company that provides cell phone service, you want to determine the…

A: It is given that margin of error (E) is 0.92 and the confidence level is 0.90.

Q: In a test for equality of two proportions, the sample proportions were p1 = 32/60 and p2 = 20/60.…

A: p1 = 32/60 and p2 = 20/60. n1=60 ,n2=60

Q: Based on the Nielsen ratings, the local CBS affiliate claims its 10 p.m Newscast reaches 54% of…

A: Answer: From the given data, Population proportion (P) = 54%                                      =…

Q: If the proportion of Heads is .45 out of 200 flips, what is the p-value?

A: The proportion of Heads is .45 out of 200 flips.

Q: In the Star and Tribune newspaper, there is an article entitled “1 in 8 school buses fail tests."…

A: Given information: Sample of 200 buses and find that 20 buses fail the safety inspection. Let us…

Q: Suppose you take a sample of 25 Reese's pieces. The proportion of orange is 0.4. What is the p-value…

A: Solution

Q: The workers at drug factory took a random sample of 800 drug tablets and found that 40 of them were…

A:

Q: recent poll reports that between 53% and 59% of voters will vote for president george in the next…

A: The confidence interval is (53%, 59%).

Q: A car dealership is deciding the proportion of cars they will order with cloth seats. You have been…

A: We have to find sample size required for given margin of error.

Q: Suppose that the number of accidents in a given highway during a 1-month period has a Poisson…

A: GivenThe average rate of accidents is 4 per monthfor 2 months λ=8 accidents in 2-month periodLet "x"…

Q: In politics, marketing, etc. we often want to estimate a percentage or proportion p. One calculation…

A: Here the proportion of people liking dark chocolate is 37% with a margin of error 2.5%  So, the…

Q: The Bangor Humane Society tracks cat adoptions closely. They sample 54 people who looked at cats…

A: Sample proportion = x/n Here x = 36 and n = 54

Q: To assess attitudes towards issues that affect the residents of a town, the town randomly chose 500…

A: Given data: Sample size (n) = 500 families Town received (x) = 370 completed surveys

Q: How many households must you survey if you want to be 94% confident that your sample percentage has…

A: Margin of error  = 0.03 Confidence level =  94%

Q: If the proportion of Heads is .25 out of 200 flips, what is the p-value? Round to three places.

A: Given : The proportion of Heads is .25 out of 200 flips.

Q: In 2016 the Better Business Bureau settled 84% of complaints they received in the United States.…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Suppose you take a sample of 25 Reese's pieces. The proportion of orange is 0.4. What is the p-value…

A: We want to find P-value  n=25 , p=0.4 , p0=0.5