A researcher wishes to estimate the proportion of corporate executives whose annual salary is over $1,000,000.  She wants to be 98% confident and be accurate within 2.5% of the true proportion.  How large of a sample should she take?

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: legally purchase alcohol in the State of Oregon (students who are 21 or over). If we want the margin…

A: Given that  Margin of error =E =5% =0.05 90% confidence interval.  NOTE:- According to bartleby…

Q: Of 60 patients treated with a certain medication, 24 showed no improvement. What percent of patients…

A: Total patient=60 Patient who showed no improvement=24 To calculate: what percent of patients…

Q: If the number of respondents in the study was approximately 44,947, estimate how many stated that…

A: answer is below

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Given:  The margin of error is equal to 0.05  Confidence Level : 95%  It is asked to compute the…

Q: The province of Pangasinan has a population of 3,163,190. Calculate the sample size using Yamane's…

A:

Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: If the distribution is approximately mound-shaped, what is the proportion less than 80.12 ? 15

A: Find the value of z using mean and standard deviation.

Q: d) What percentage of women are TALLER than 5 feet 11 inches? Round to nearest tenth of a percent. %…

A: Given Information: Mean height of adult men = 69.8 inches The standard deviation of height of adult…

Q: What is the estimate of the common population proportion?

A: To find: The estimate of common population proportion

Q: Use Table B to answer the following question. 1. What proportion lies to the left of z=2.64?

A: Given that: Z is standard normal Distributed with i.e. mean µ =0 and standard deviation σ =1 By…

Q: Find the mean of the 12 sampled ratios. =

A: Mean is defined as the sum of observations divided by number of observations. Number of observations…

Q: Angela took a general aptitude test and scored in the 85th percentile for aptitude in accounting.…

A: A percentile can be defined as the value below which a certain percentage of values fall for a set…

Q: Solve the problem. Round the point estimate to the nearest thousandth. 6) Find the point estimate…

A: Here we need to find the point estimate for the proportion of people who wear an hearing aid.

Q: An event marketing executive thinks that the proportion of consumers who have seen his company’s…

A: In general terms, the larger the sample size n, the more precise of an estimate can be obtained of…

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

A:

Q: c)   If the scientists want to estimate the proportion of deer that carry Lyme disease ticks to…

A: We have given that,  Margin of error (E) = 0.02 and confidence level = 90% Then,  We will find the…

Q: a. What percentage of adult men can fit through the door without bending?

A: Let , X be the height of men. Here , X→N(μ=67.1 , σ=3.6) Since , the door height is 56.2 in. Our aim…

Q: What does the test of a single proportion entail?

A: The One-Sample Proportion Test is used to assess whether a population proportion (P1) is…

Q: Can you think of an area where it might not be practical, for a variety of reasons, to sample 100%…

A: Yes, there are several areas where we cannot sample 100% of the population being covered to test.

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.90.

Q: what percentage of the men worked?

A: men women total work 15 23 80 not work 23 28 51 total 38 93 131 what percentage of the…

Q: A group of researchers want to investigate the academic performance of the college students in…

A: Given that, N = 12000 Margin of error (e) = 0.05 The formula for calculating the sample size is,

Q: A pollster wishes to estimate the true proportion of US voters who oppose capital punishment. How…

A: Given information Error = 3.5% = 0.035 Confidence level = 0.90

Q: A marketing company is interested in the proportion of people that will buy a particular product.…

A: We have to write the correct terms .

Q: Use the data and the correct formula to find the margin of error for estimating a population…

A: Given: n = 100 x = 45 sample proportion = x / n = 45/100 =0.45 95% level of confidence  Level of…

Q: d) What percentage of women are TALLER than 5 feet 11 inches? Round to nearest tenth of a percent.…

A: formula for z-score is

Q: In many states, a 17% risk of a car accident with a blood alcohol concentration of 0.08 is the…

A: Since, it is given that in many states, a 17% risk of a car accident with ablood alcohol…

Q: A pharmaceutical researcher wants to determine the proportion of people who believes that branded…

A: For the given data n = ?

Q: What proportion of the general population has an IQ of 70 or less?

A: It is an important part of statistics. It is widely used.

Q: a researcher wants to find the proportion.  what size sample should be obtained in order to be 90%…

A: We have given that,  Confidence interval = 90% and Margin of error (E) = 3% = 0.03 Then,  We will…

Q: the brand manager for a toothpaste brand must plan a campaign designed to increase brand…

A: The error is ±1.96×p1-pn=0.05assume p=0.5. This will give the most conservative estimate square on…

Q: The Humane Society is interested in finding out how many households in America have at least one…

A: The provided information are: Confidence level = 95% = 0.95 Margin of error (E) = 4% =0.04 From the…

Q: How large a sample must she select if she desires to be 98% confident that the true mean is within 4…

A: HERE GIVEN , population standard deviation  = 6 ounces  confidence level = 98%  MOE  = 4

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Here  sample proportion = 42/120= 0.35

Q: For a survey based on 1,900 adults, what is the conservative margin of error as a proportion? (Round…

A: MOE

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: a) What proportion of the sampled wafers had (P 2 8)? b) What proportion of the sampled wafers had…

A: 5. a) The frequency is, Number of Particles Cumulative frequency Frequency Number of Particles…

Q: mr. One researcher wants to estimate the proportion of MU students who are vegetarian, 6 answered…

A: Sample size is 30. There are 6 students are vegetarians. The hypotheses are given below: Null…

Q: The brand manager for a brand of toothpaste must plan a campaign designed to increase brand…

A: Solution: From the given information, confidence level is 0.95 and E=0.05. Since the proportion is…

Q: What percent of Males are Right Handed? (Round to the nearest Whole Percent) Gender compared to…

A: In this question we need to find a % of males are right handed . While calculating percentage of…

Q: What does the margin of error for the estimate of a population proportion tell you?

A: The formula for margin of error can be written as:

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

A: Solution: From the given information, confidence level is 0.95, p=0.35 and E=0.10.

Q: With no preliminary estimate of the proportion known, how many young adults would you survey to…

A: It is given that margin of error (E) is 0.10 and the confidence level is 0.99.

Q: (a) What proportion of combined GRE scores can be expected to be over 163.4? (b) What proportion of…

A: mean = 150 s = 8.8

Q: You would like to be 99.9 confident that your estimate is within 2% of the true population…

A:

Q: Practice questions for a textbook are marked with difficulty levels of easy , intermediate , and…

A:

Q: Given μ=25and σ=4.8,what would be the x-value for the ninety-fifth percentile?

A: Given:  μ=25 σ=4.8

Q: Given μ=25and σ=4.8,what would be the x-value for the twenty-fifth percentile?

A:

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.