An educator desires to estimate, within 4%, the true percentage of high school students who study at least 1 hour each school night.  He wants to be 95% confident.  How large a sample is necessary?

Q: 35. In a large sample, which is the bigger concern?

A: HERE GIVEN, SAMPLE SIZE IS TOO LARGE

Q: In a sample of 550 students, 80% prefer online resources versus printed materials. The standard…

A:

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

A:

Q: How large a sample should be surveyed to estimate the true proportion of college students who surf…

A:

Q: I want to estimate the proportion of college professors who believe in aliens. How many college…

A: Given Confidence interval=90% sample proportion is within 5 percentage

Q: The executives at Sandbachian, inc., having recently solved their widget crisis, have another…

A: Let ‘x’ be the no of defective manhole covers i.e x=40 and n=800 sample propotion (P)=x/n p=40/800…

Q: You work for NASA and are interested in determining the population proportion, with 99% confidence,…

A:

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: Based on the Nielsen ratings, the local CBS affiliate claims its 11 p.m. newscast reaches 41% of the…

A: From the given information, The sample size is 100 viewers. Among 100 viewers, 36% indicated that…

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

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

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: A marketing research firm wishes to conduct a poll in a certain region to estimate the proportion of…

A: Solution: From the given information, confidence level is 0.90 and E=0.03.

Q: A manufacturer of golf equipment wishes to estimate the number of left-handed golfers. How large a…

A: Given,          Sample proportion  P∧=0.09          Margin of Error∈=0.04          and…

Q: What is the formula to be used to determine the total possible random samples?

A: Let the population size be N Sample size be n

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

A: When we don't have any prior information about population proportion, we generally take it as 0.50.…

Q: Henry conducts a survey at his middle school to determine the students' favorite after-school…

A: There are four main types of probability sample. Simple random sample: In this, every member of the…

Q: Based on the sample, predict the number of adults in Palm City whose main source of news is…

A: In sample, number of adults whose main source of news is newspaper, X = 54 Sample size n =…

Q: The owner of a local bar specializing in alternative music wanted to determine the average age of…

A: t 95% confidence level, the z value is 1.96 which can be obtained by using the standard normal…

Q: ucled a survey among randomly selected target market households and wanted to be 99% confident that…

A: Let us assume sample proportion (p^)=0.51-p^=1-0.5=0.5α=1-0.99=0.01α2=0.025Z0.025 =2.58 (from…

Q: When working with the sampling distribution of a sample proportion, what do we need to require to…

A: Sampling Distribution of a Proportion There are several ways to calculate the sampling distribution…

Q: A researcher studying the proportion of 8 year old children who can ride a bike, found that 219…

A: Given: n= 567 ,x= 219.0 Need to find sample proportion.

Q: Male penguins that weigh more than 4710 grams are considered "desirable" because the extra fat means…

A: We need to find expected value of desirable penguins Let us find out probability of a desirable…

Q: From the sample statistics, find the value of p1 - p2, the point estimate of the difference of the…

A: From the provided information,

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

A: Solution: From the given information, confidence level is 0.96, p=0.54 and E=0.02.

Q: estimate the sample size

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

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

A: From the provided information, Margin of error (E) = 6% that is 0.06 Confidence level = 95% The…

Q: Why a sample size of n=100 is more likely to have a percentage of pop songs closer to the population…

A: Sample of size 32 or greater is consider as large sample .

Q: If we wanted a random sample of students in a cafeteria, why couldn't we just take the students who…

A: Answer: Here random word itself says that we couldn't just take the students who order coke with…

Q: should their sample size be?

A: here use solvin's formula

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: In each of Exercises, explain the effect on the margin of error and hence the effect on the accuracy…

A: Formula for the margin of error is given by

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: For the scenarios below, determine which sampling method was used (simple random, cluster,…

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Q: The executives at Sandbachian, Inc., has recently solved their widget crisis, have another problem…

A:

Q: The theater owner wants to sample 250 customers out of the 3500 in attendance. This will be a 1 in k…

A: Population is the set of all objects of interest. Sample is s subset of the population. It is not…

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

A:

Q: a) What proportion of workers answered yes to the survey? b) What was the margin of error?

A: Here, the 95% confidence interval for the proportion of workers that answered 'yes' is (0.62, 0.73).…

Q: A university dean is interested in determining the proportion of students who receive some sort of…

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: 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: A previous study showed that 69% of community college students have read a book for personal…

A: Given info: A previous study showed that 69% of community college students have read a book for…

Q: If you want to be 99​% confident of estimating the population proportion to within a sampling error…

A: From the provided information, Confidence level = 99% Margin of error (E) = ±0.05 Proportion (p) =…

Q: The manager of a small supermarket chain wants to estimate the proportion of time stockclerks spend…

A: Assume that the population proportion is 0.5. It is known that the critical value for 98% confidence…

Q: A university dean is interested in determining the proportion of students who receive some sort of…

A: Given: Confidence level=95%Margin of error E=2% From the Standard Normal Table, the value of z* for…

Q: A market researcher wishes to determine the proportion of American consumers who shop online for…

A:

Q: suppose you select a simple random sample of 75 douglas college student and you find that 8 are left…

A: It is given that the sample size n is 75 and x is 8.

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

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

Q: Give two reasons why it would be necessary to examine a sample of the shirts produced rather than…

A: Give two reasons why it would be necessary to examine a sample of the shirts produced rather than…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.