A recent poll of 800 people who work indoors found that 208 of them smoke. If the researchers wnat to be 98% confident of their results to within 3.5% of the true proportion of workers who smoke, how large a sample is necessary? 604 660 853 968

Q: How many levels are in each factor of a 2 x 2 ANOVA? 2. 4. 8. can not determine

A: How many levels are in each factor of a 2 x 2 ANOVA? 2. 4. 8. can not determine Explanation: Here,…

Q: Students at Neilson Middle School are asked if they prefer watching television or listening to the…

A: Given that, The total number of students at Neilson Middle School is 150. The number of students,…

Q: A business journal investigation of the performance and timing of corporate acquisitions discovered…

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Q: The following table is based on a random sample of people age 18 and older who said they were…

A: b) Given information:   Male Female Total Bringing a laptop 354 307 661 Not Bringing a laptop…

Q: invested in bonds. For a = .10, does the test show enough evidence to declare that the proportion of…

A: Given: Sample size, n = 215 x = 91 Population proportion, p = 0.57  significance level

Q: A local college recently made the news by offering foreign language-speaking dorms to its students.…

A:

Q: A researcher at a major hospital wishes to estimate the proportion of the adult population of the…

A: Obtain the large sample size. The large sample size is obtained below as follows: Use EXCEL…

Q: A grocery store has determined that in crates of tomatoes, 95% carry no rotten tomatoes, 2% carry…

A: Given: The probability that crates carry no rotten tomatoes is 0.95. The probability that crates…

Q: A recent survey found that 58% of U.S. adults use their smartphones to research and shop for…

A: The expression is  The margin of error is given as 5.3%.

Q: what is the z score that corresponds to P18

A: The standard normal variable Z follows normal distribution with mean 0 and standard deviation 1.

Q: A normal population has a mean of µ = 80 with σ = 20. a. If a single score is randomly selected…

A:

Q: A pollster wishes to estimate the number of left-handed scientists. How large a sample isneeded in…

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Q: For a population with σ = 12, how large a sample is necessary to have a standard error that is:…

A: What the standard error gives in particular is an indication of the likely accuracy of the sample…

Q: In October 2017, the Gallup Poll asked a sample of 10281028 U.S. adults, "Are you in favor of the…

A: Given, n=1028 Consider that the population standard deviation is σ, the level of significance is α.…

Q: A pollster wishes to estimate the proportion of United States voters who favor capital punishment.…

A:

Q: 3. For a population with µ = 40 and o = 8, what is the z-score corresponding to X = 34?

A:

Q: Claim: u> 1300; a= 0.06; o = 202.14. Sample statistics: x= 1316.85, n= 275 .....

A: Given that  Claim : μ>1300 ; Level of significance (α) = 0.06 Standard deviation (σ) = 202.14…

Q: About 7% of males are colorblind. Hoping to find many colorblind men for her study, a researcher…

A: It is given that p =0.07 and n = 433.

Q: A hospital has studied its patient history and had concluded that 2% of patients that have been…

A: Given: Proportion of patients infected with staff bacteria = 2100=0.02

Q: How many success in the sample? How many failures in the sample? ? What size sample does the…

A: Answer:-  Given, n=1800

Q: The head of a computer science department is interested in estimating the proportion of students…

A: Given: Margin of error E = 0.04 Significance level α = 0.05 The critical value Zα/2=Z0.05/2=1.96 The…

Q: If a researcher reported for a single-sample t-test that t(17) = 2.90, p<.02, how many subjects…

A: It is given that the test is single-sample t test and the degrees of freedom is 17.

Q: A medical researcher wants to do a study on the proportion of knee replacement surgeries that result…

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Q: Based on the Nielsen ratings ,the local CBS affiliate claims its 11 p.m newscast reaches 43% of the…

A:

Q: A large university has 24,000 student a randomly-selected sample of 750 students were surveyed  and…

A: Given that there are 24,000 students out of which a randomly selected sample of 750 students. out of…

Q: survey of 300 union members in New York State reveals that 112 favor the Republican candidate for…

A: The sample proportion is computed as follows,  The value of z at 98% confidence level is 2.326,…

Q: A genetic theory says that a cross between two pink flowering plants will produce red flowering…

A: Solution-: Given: We find value of sample size, n=?

Q: For the survey method to be valid, a representative sample of peoplemust be polled. T or F?

A: The survey methodology essentially involves the study of individuals (or a specified group of finite…

Q: The symbol μ¯xμx¯ represents the mean of a sample of size n. True False

A: The given statement is TRUE. Because, the symbol µx-bar represents the mean of a sample size, n

Q: A group of students need to submit a project and they need to survey people about their daily…

A: see the handwritten solution

Q: A​ state-by-state survey found that the proportions of adults who are smokers in state A and state B…

A: Consider p1 as the proportion of adults who are smokers in state A and p2 as the proportion of…

Q: A hospital has studied its patient history and had concluded that 2% of patients that have been…

A: Given: 2% of patients have been admitted with staff bacteria.

Q: A recent poll of 700 people who work indoors found that 280 smoke. If the researchers want to be 98%…

A:

Q: The table below shows the data for a random sample of fish that were collected from and later…

A: Total number of fishes is, 52+61+87 = 200 Number of bluegills is 87. Proportion of bluegills is, 87…

Q: A survey of 400O non-fatal accidents showed that 189 involved the use of a cell phone. Determine a…

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Q: What percent of our campus is female? The Statistical Abstract of the United States, 112th edition,…

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Q: A research report from an independent-measures study states that there are significant differences…

A: The degrees of freedoms are 2 and 36.

Q: 4. Find the point estimate of the proportion of people who wear hearing aids if, in a random sample…

A: We have given that, x= The number of people who wear the hearing aid   = 30 n= The total number of…

Q: Determine the test score of John in Statistics if he has a z-score of 1.89. (SD = 4, mean = 82)

A:

Q: In a sample with M = 40 and s = 8, what is the z-score corresponding to X = 38? %3D

A: Solution: 7. From the given information, M=40 and s=8.

Q: An entertainment company surveyed 360 elementary school children and found that 153 of them were…

A:

Q: Why must the sum of all fs in a sample equal N?

A: Every datum in a sample is assigned to a category/class depending on its value. For a given dataset,…

Q: How large a sample is needed

A: Given :  Margin of error=E=3%=0.03 Significance level=α=0.01 The critical value is ,…

Q: A population with a mean of 8 has a sum of 40. How many scores are in the population?

A:

Q: mple is rder to be 99% confident that the sample proportion will not differ from the true proportion…

A: Given : Margin of error: ME = 0.06 sample proportion: p̂ = 0.23

Q: The Canadian Chiropodists Society states that  36 % of women wear shoes that are too small for their…

A: GivenMargin of error(E)=0.02p^=0.36confidence interval = 98%

Q: According to the Humane Society, 33% of households in the United States own at least one cat. You…

A: From the given information p Value is 0.092. We want to interpret it.

Q: Determine the test score of John in Statistics if he has a z-score of 1.9. (SD = 4, mean = 85)

A: Given that in statistics, John has z-score of 1.9 where mean score is 85 and SD is 4. Here, to find…

Q: For a study that consists of 30 individuals in the 5 groups. What would the q in the HSD formula…

A: The correct option is: (3) 3.90. Here, the number of groups (k) is 5.There are 30 individuals in…

Q: C1. A computer spam filter is 98% effective at sending spam emails to my junk folder, but will also…

A: Solution

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.