A political candidate has asked you to conduct a poll to determine what percentage of people support her. If the candidate only wants a 9% margin of error at a 99% confidence level, what size of sample is needed? (Because the sample population proportion is not given, assume ˆpp^ is 0.5 and round the final answer up to the next whole number.) n=n=

Q: A researcher is interested in the issue of cheating on college campuses. She conducts an anonymous…

A:

Q: or the population of 31 companies surveyed, with an average size of 1,414 workers? What type of…

A: Given  Average size = 1414 Companies = 31 The total population will be = 31*1414 =43834

Q: According to the Department of Education, 60% of college students enjoy taking Statistics. Suppose…

A: Let  X be the number of students who enjoy taking Statistics in a sample of 200. Given n = 200…

Q: Most grad schools require 1000 on GRE.  It's a composite score, with two parts (like SAT). Each part…

A:

Q: The P-value for this sample

A: From part a), the degrees of freedom is 4. The test statistic is 42.37.

Q: n Find the size of the sample needed to estimate the difference between the proportions of Democrats…

A:

Q: You want to obtain a sample to estimate a population proportion. At this point in time, you have no…

A: Given Information: Confidence level = 80%  Error (e) = 0.05 Proportion (p) = 0.5 (assumed)  The z…

Q: find the z-number associated with a 92% level of confidence. find the z-number associated with a…

A:

Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.35…

A:

Q: Let's say we collect a sample of 500 individuals from a community in Reno and find that 20 of them…

A: Test statistic formula for testing one sample proportion is, z=p^-pp1-pn  =p^-pSEp In the given…

Q: Find the margin of error if the sample proportion is 0.37 and the sample size is 300. on Consider…

A: Margin of error is the error due to random sampling. The margin of error decreases with increase in…

Q: In a recent year, a poll asked 71 random adult citizens of a large country how they rated economic…

A:

Q: sample proportion is p= und to three decimal places as needed.)

A: Given Number of sample of teenagers between 13 to 17 year of ages(n)=280

Q: If a researcher were to increase a sample size from n = 30 participants to n = 80 participants, what…

A: Increase power

Q: if the 90% Ci for the population mean is (-2. 58, 7.54) what is the sample mean О a.248 ОБ. 10.12 O…

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

Q: researcher wishes to estimate the proportion of the adult population of the U.S. has sleep…

A: E=0.03 99% confidence interval for z=2.576 p=0.5

Q: Suppose you survey a random sample from a large population to understand the population proportion.…

A: Given information- Margin of error, E = 6% = 0.06 Confidence level, c = 98% Since nothing is known…

Q: A random sample of 300 students was taken from an affluent school district. There were 75 students…

A: The sample size is 300, number of students who were coached for the SAT's is 75. The sample…

Q: Determine the probability of seeing a Z score of -5.28 or one with a larger absolute value.

A: Z = -5.28 P( Z > -5.28) = 1 – P(Z < -5.28) = 1 – 0 = 1 P(Z < -5.28) = 0 (From Excel…

Q: What happens to the interval as you increase the confidence of the sampling distribution?

A: As the confidence level increases the width of the confidence interval increases and as the…

Q: estimate the sample size

A: An estimate of sample size: The appropriate sample size for estimating the mean of a variable from…

Q: (a) Estimate the number of visitors in the sample who actually are looking for the company's website…

A: Not all visitors to a certain company's website are customers or potential customers. In fact, the…

Q: Reviewing the sample of offspring of "highly irradiated" male radiologists 92 were female and 53…

A: The total number of offspring in the sample can be calculated as:

Q: Assuming the regression line: P = 0.8 - 0.2X Then, at the value of X=4 that the linear regression…

A: Ycap=0.8-0.2*X  We want to find the intercept on X axis. Note: According to Bartleby Expert…

Q: 21. Touch Therapy When she was 9 years of age, Emily Rosa did a science fair experiment in which she…

A: Solution : Given that : when she was 9 years of age. Emily Rosa did a science fair experiment in…

Q: If a manufacturer conducted a survey among randomly selected target market households and wanted to…

A: question: If a manufacturer conducted a survey among randomly selected target market households and…

Q: z-score that is greater

A: we can assume it to be standard normal distribution with mean = 0 standard deviation = 1

Q: A researcher wanted to estimate the proportion of undergraduate college students (18– 29 years) with…

A:

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

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.95.

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

A:

Q: The distances golf balls travel under laboratory testing conditions are normally distributed. The…

A:

Q: Find the sample size required to estimate the percentage of statistics students who take their…

A:

Q: Suppose that I want to estimate the percentage of students who  love statistics in California. How…

A: Given information- Margin of error, E = 3% = 0.03 Confidence level, c = 90% Since nothing is known…

Q: na previous year, 58% of females aged 15 and older lived alone. A sociologist tests whether this…

A: Solution: Given information: n= 350 Sample size of females  x= 210 females are living alone…

Q: Disney Corporation would like to know what proportion of diners at Disney Springs would prefer to…

A: P=0.8q=0.2M. E. =0.02=0.05

Q: a random sample, this most likely made the data more accurate, but not precise O precise, but not…

A: 1):   Precise but not accurate  Explanation: In a high precision, low accuracy case study, the…

Q: A researcher wanted to estimate the proportion of undergraduate college students (18– 29 years) with…

A:

Q: A sample proportion is calculated from a sample size of 132. How large of a sample would we need in…

A: given data  sample size (n) = 132 how large the sample required to decrease standard error by factor…

Q: It is not important to collect samples randomly. True or false

A: Any sample must be collected using the random techniques. If the samples are not collected randomly…

Q: Equal to 3.7s O Could be greater than or lower than 3.7s O Less than 3.7s Greater than 3.7s

A:

Q: in a nation would skip an ortant event such rthday party ersary dinner to watc e pr Assume the…

A: given data, n=629x=433p^=xn=433629=0.6884α=0.10claim:p>0.66

Q: Prof. Jacob wants to know, with 90% confidence, the proportion of students who like to eat in the…

A: Given, Confidence interval, α = 90 Sample proportion, p^ = 0.62 Margin of error, M.E = 0.025

Q: udents took a test. 3 of them scored 4, 4 and 7 ma median and mode is 5, the upper quartile is 8 and…

A: Median is a positional average that divides the data set into two equal parts. In case of ungrouped…

Q: what sample size should a researcher take if he wants to estimate a population proportion to be 2%…

A: From the given information,   Margin error = 0.02 Assume sample proportion = 0.5   Critical value:…

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.