You wish to estimate, with 90% confidence, the proportion of tablet owners who use their tablets daily. Your estimate must be accurate within 2% of the population proportion. No preliminary estimate is available.  Find the minimum sample size needed.

Q: When estimating the minimum sample size required for a research, if we do not have the preliminary…

A: It is given that, preliminary estimate of proportion is not known.

Q: The required sample size is (Round up to the nearest whole number as needed.) Does the sample size…

A: Sample mean is within 0.014 of the population mean, Margin of error=0.014 At 98% confidence…

Q: Find the sample size using the range rule of thumb to estimate a.

A: Given : Highest observation=155 bpm Lowest observation=35 bpm Margin of error=E=3 bpm Significance…

Q: 1. A dermatologist wishes to estimate the proportion of young adults who apply sunscreen regularly…

A: From the provided information, Margin of error = 0.03 Confidence level = 90%

Q: In order to estimate the population proportion with a high school education,  you need a minimum…

A: It is given that margin of error (E) is 0.07 and the confidence level is 0.95.Here,

Q: The required sample size equals:

A: It is given that, H0: μ = 13.50 Vs. H1:  μ>13.50. The sample mean based upon some sample size =…

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: isn't the sample size should be 35, not 12?

A: We have given that the information presented by the tutorial school related to the IELTS  mock…

Q: Does the sample size ? affect the mean of all possible sample means? Explain your answer.

A: According to central limit theorem, for large sample (>30) or if the population follows normal…

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

A: Given:- We can think of an area where it might be practical, for a variety of reasons ,to sample…

Q: How large must the sample size be in order to to estimate a true proportion to within one percentage…

A: Given that, Critical value: Using the z-table, the critical value at 90% confidence level…

Q: When you are conducting the t test, the sample size must be greater than .30

A: We have to find the statement is true or false....

Q: Explain why you should get a much better prediction for μ by using x from a sample size n rather…

A: The confidence interval on mean is given as x-Zα2sdn≤μ≤x-Zα2sdn where  μ=population meanx=sample…

Q: What sample size should you gather to achieve a 0.7 hour margin of error?

A: here given , population standard deviation  = 4.2 hour  confidence level = 99% MOE  = 0.7

Q: A researcher wishes to estimate, with 93% confidence, the percentage of people who own a home…

A:

Q: Given the desired margin of error, population standard deviation, and level of significance, we use…

A: Solution

Q: What sample size should be selected to estimate the proportion of out of state guests with a margin…

A: Margin of error, ME = 0.05 sample proportion, p̂ = 0.45 confidence level, c = 95 % = 0.95…

Q: #5 What sample size is needed to give a margin of error of  ±4%  in estimating a population…

A:

Q: Suppose that you are attempting to estimate the weight of 600 parts. In order to use the infinite…

A:

Q: The chancellor wants you to calculate the largest sample size needed with a margin error of 5% and…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: What happens to the sample size when you don’t know a prior sample proportion?

A: To calculate the sample size when we do not know prior sample proportion.

Q: We need to estimate the percentage of businesses that plan to hire additional employees in the next…

A:

Q: You are the operations manager for an airline and you are considering a higher fare level for…

A: You are the operations manager for an airline and you are considering a higher fare level for…

Q: If we would like to decrease the margin of error without changing the sample size, what must happen?

A: We have to find what to do to decrease margin of error.

Q: estimate the sample size for a population of 750 people.

A: To estimate the sample size the required calculation can be defined by the formula  Slovin's…

Q: What is the value of the standard score for the sample proportion?

A: If mean if the proportion us P And standard deviation is √(pq/n) Then standard score or Z score for…

Q: When calculating the sample size for a research study, a researcher should always round the final…

A: The statement is true.

Q: should their sample size be?

A: here use solvin's formula

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 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: Define the standard error for the sampling distribution of proportions.

A: Introduction: The standard deviation of the distribution of sample proportion is called the standard…

Q: What value should we expect for our sample proportion?

A: We have to answer question based on proportion.

Q: Suppose you would like to estimate, with 97% confidence, the proportion of computers that need…

A: It is given that the level of confidence is 97% and desired margin of error E is 0.035.The formula…

Q: what sample size should be used?

A: Given :  Margin of error=E=3%=0.03 Significance level=α=0.05 Since , the estimate of the population…

Q: 1. How many samples must be considered from a population of 28,000 students, if 5% margin of error…

A:

Q: If you want to be 95​% confident of estimating the population proportion to within a sampling error…

A:

Q: etermine what percent of pre-kindergarten children ages 3 to 5 whose mother had a bachelor's degree…

A: When we don't have any prior information about the population proportion, we generally take it as…

Q: What is the Importance of Equal Sample Sizes?

A: The t-test and ANOVA assume that the sample sizes are equal. There is an importance that the two…

Q: Does the sample size n affect the mean of all possible sample means? Explain your answer.

A:

Q: What are the practical Reasons for learning how to use the formula in determining sample size?

A: The two major factors affecting the power of a study are the sample size and the effect size A…

Q: estimate the population proportion p,what is the minimum sample size we need in order to achieve a…

A: Solution: From the given information, confidence level is 0.95, p=0.1 and E=0.01.

Q: How large must the sample size be in order to estimate a true proportion to within one percentage…

A: It is given that margin of error (E) is 0.01 and the confidence level is 0.99.

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A: Formula for margin of error is ME = Zα/2 * σ / √n where Zα/2 = critical value

Q: he required sample size is. Round up to the nearest whole number as needed.)

A: It is given that confidence level is 0.98, population standard deviation is 17.8 and the margin of…

Q: 2. Find the minimum sample size needed to be 90% confident that the true proportion of students who…

A: Obtain the sample size of a no preliminary estimate for p. The formula of sample size is,

Q: We are interested in conducting a study in order to determine what percentage of voters of a state…

A:

Q: Explain why increasing the sample size tends to result in a smaller sampling error when a sample…

A: Sampling error:When a sample is used to estimate a population characteristic, the error resulting is…

Q: If you want to construct a 90% confident interval for a population mean such that it is within a…

A: The confidence interval for the mean is given by :    CI = x¯ ± zα2 ×σn x¯ : sample mean σ :…

Q: How large must the sample size be in order to to estimate a true proportion to within one percentage…

A:

Q: What does the SEM value tell us about the magnitude of sampling error?

A: Introduction: Suppose a random sample of size n is taken from a population with mean μ and standard…

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.