2) You are planning a survey for which the findings are to have a 95% level of confidence. How many people should you survey so that the margin of error is at most +1.8%?

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: (a) The proportions are 22.2% for males and 18.7% for females, The margin of error is 3%, and…

Q: 2. Given: n=80, a = 15, level of confidence is 92%. What is the margin of error of the given data?

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Margin of Error(E)=0.05For 99% confidence level Zα2=2.576 Formula; E=Zα2×(p×(1-p)n)

Q: Example 1: The Harvard School of Public Health survey found that 2486 of a sample 10,904 college…

A: Given: The sample number of college graduates are n=10904. The number of college graduates who said…

Q: If n=23, ¯x(x-bar)=47, and s=2, find the margin of error at a 90% confidence level Give your answer…

A:

Q: If we want to be within 0.02 of the true proportion of homes that have a direct television receiver…

A: The population proportion is 82%, the confidence level is 98% and estimate is within 0.02.…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A:

Q: 4. Thirty-five percent of adult Americans are regular voters. A random sample of 250 adults in a…

A:

Q: If n=16, x(x-bar)=43, and s=9, find the margin of error at a 99% confidence level Give your answer…

A: The random variable X follows normal distribution. The sample size is 16. The sample mean is 43. The…

Q: You are running a political campaign and wish to estimate, with 95% confidence, the proportion of…

A: Formula for the sample size needed to estimate a population proportion is

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: It is given that margin of error (E) is 0.04 and the confidence level is 99%.Here,

Q: 3. A political scientist would like to estimate the proportion of voters who read their ballot…

A: To calculate: How large of a sample size does she need?

Q: If n=13, x(x-bar)=30, and s=9, find the margin of error at a 99% confidence level Give your answer…

A: Given,n=13x=30s=9α=1-0.99=0.01α2=0.005degrees of freedom(df)=n-1=13-1=12t0.005(12)=3.055

Q: If n=24, x(x-bar)=33, and s=3, find the margin of error at a 90% confidence level Give your answer…

A: It is given that standard deviation (s) is 3 and sample size (n) is 24.

Q: If n=12, ¯x(x-bar)=35, and s=2, find the margin of error at a 98% confidence level Give your…

A: Given: n=12 ¯x(x-bar)=35 s=2

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) Given,   Margin error = 0.02 Population proportion = 0.36   The objective is to find the sample…

Q: 1. Suppose survey results say that 69% of the adult females from a sample taken in the United States…

A: Proportion (p) = 69 %  Margin of Error (E) = 3%  Alpha = 95%  FIRSTLY calculate the confidence…

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: GivenMargin of error(E)=0.03confidence level(c)=99%α=1-0.99=0.01α2=0.05zα2=z0.05=1.6449   (from…

Q: If n=11, ¯x(x-bar)=43, and s=10, find the margin of error at a 99% confidence level Give your…

A: Given that  n=11, ¯x=43 and s=10,

Q: 4. The Department of the Treasury is interested in finding out what proportion of people support…

A: Given that  Population proportion p=15%=0.15 Margin of error =E =2%=0.02 95% confidence.  NOTE:-…

Q: 2. A researcher wants to estimate the daily expenses of college students. He wants a 95% confidence…

A: We have given that,  Population standard deviation (σ) = 99.50, margin of error (E) = 45 and…

Q: If n=23, ¯x(x-bar)=34, and s=8, find the margin of error at a 99% confidence level Give your answer…

A: Solution: From the given information, n=23, x-bar=34 and s=8. The confidence level is 0.99.

Q: If the candidate only wants a 6% margin of error at a 99% confidence lev

A: Given that, The margin of error (E) is 0.06. Assume that p as 0.5.

Q: 4.An internet service provider wishes to estimate, to within one percentage error, the current…

A: Given : Margin of error (E) = 1% = 0.01 Confidence level = 85% So , significance level (α) = 15% =…

Q: 3. A Gallup poll conducted in 2010 found that 494 of 1050 adult Americans believe it is the…

A: Given that  Sample size n =1050 Favorable cases x =494 Sample proportion p^=x/n  =494/1050 =0.4705

Q: If the Census wants to increase its level of confidence and keep the error bound the same by taking…

A: Given information: The census wishes to increase the level of confidence (c). The error bound (MoE)…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: a) Compute the required sample size using the formula: E=zα2 p⏞11-p⏞1n+p⏞21-p⏞2n   Where 'E' is the…

Q: If n=17, ¯xx¯(x-bar)=47, and s=4, find the margin of error at a 80% confidence levelGive your answer…

A: Given data Sample size (n) = 17 x̅ = sample mean = 47 s = sample standard deviation = 4 Confidence…

Q: Suppose you wish to estimate a population mean based on a random sample of n observations, and prior…

A: The population standard deviation is 12.7, the margin of error is 1.6 and probability(or confidence…

Q: A television sports commentator wants to estimate the proportion of citizens who​ "follow…

A: Given Data: Margin of Error=0.22 p=0.54   z-value=1.96

Q: Suppose we have the results of a Gallup survey (simple random sampling) which asks participants for…

A:

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: It is given that there is 95% confidence.

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: Solution: From the given information, confidence level is 0.99, p=0.25 and E=0.03.

Q: If n=13, = 42, and s=7, find the MARGIN OF ERROR at a 99% confidence level

A:

Q: Suppose a study revealed 46% of all subjects possessed trait A, 16% possessed both trait A and trait…

A: Solution

Q: 4. How large a sample must be taken to estimate the proportion of households in which a cell phone…

A: In probability theory, a normal distribution is a type of continuous probability distribution for a…

Q: A physical therapist wants to determine the difference in the proportion of men and women who…

A: Percentage of level of confidence is 95%. Here, margin of error is, E=0.03.

Q: 1. Given: n=130, a = 25, level of confidence is 90%. What is the margin of error of the given data?

A: The sample size is given as 130, n=130 The standard deviation is given as 25, σ=25 The Confidence…

Q: A pollster wants to conduct a pre-election poll with a margin of error of 2.5% and a 95% confidence…

A: We have given that,  Margin of error (E) = 2.5% = 0.025 and confidence level = 95%  Then, We will…

Q: in a poll 51% of people polled answered yes to the question Are you in favor of the death penalty…

A: Given, p=0.51 M.E=0.02 α=1-0.94=0.06 As per z-distribution table, the critical value of z at 0.06…

Q: A research institute poll asked respondents if they felt vulnerable to identity theft. In the poll,…

A: Given data n=1026 x=520 confidence interval=95%

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny What size…

A:

Q: If n=15, (x-bar)=46, and s=3, find the margin of error at a 90% confidence level Give your answer to…

A: According to the given information, we haveSample size, n = 15Sample mean = 46Sample standard…

Q: If n=23, x(x-bar)=47, and s=3, find the margin of error at a 98% confidence level Give your answer…

A: Margin error is the difference between the estimated value and the original value. Here the critical…

Q: If n=12, x¯(x-bar)=47, and s=3, find the margin of error at a 80% confidence level

A: Margin of error (E): The margin of error for sample mean is given by,

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny . What…

A:

Q: A researcher wishes to estimate the percentage of adults who support abolishing the penny. What size…

A: a) Given that: p= previous estimate = 32% =0.32 e= error= 3%=0.03 z=critical value for confidence…

Q: 1(b). At 99% confidence, what is the margin of error?

A: here use given data table

Q: Set up the null and alternate hypotheses to test whether the population mean is equal to 10 when you…

A: The Null hypothesis is  Ho: μ=10