If there was a 95% confidence interval of say, (0.48, 0.68), about a product being preferred by consumers, how could a business use this result in making a marketing statement about their product?

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Given data,     P=58%=0.58     E=7%=0.07     z-value at 95% confidence is  zc =1.98     n=?

Q: a 99% confidence interval

A: Confidence interval :  Confidence interval measures the degree of uncertainty. or it is the…

Q: What is meant by saying that a 1-a confidence interval is a. exact?b. approximately correct?

A: a.Confidence Interval:Confidence interval is the interval estimate of the population parameter. It…

Q: What is the one exception to using the z score for confidence intervals?

A:

Q: What are the conditions for a confidence interval?

A: A confidence interval tells the possible range around the estimate and also how stable the estimate…

Q: Generally speaking, what is the difference between a confidence interval and a prediction

A:

Q: Cameron and Bailey each take random samples and construct 90% confidence intervals for the…

A:

Q: A magazine provided results from a poll of 1000 adults who were asked to identify their favorite…

A: Confidence interval:The (1-α) % confidence interval for proportion p is given by,

Q: 11) In a Gallup poll, 1011 adults were asked if they consume alcoholic beverages and 64% of them…

A: (11) Obtain the 90% confidence interval estimate of the proportion of all adults who consume…

Q: The results of a recent poll on the preference of teenagers regarding the types of music they listen…

A: We have given that,  X1= 448, n1= 800 and X2 =585, n2 = 900 Then,  We will find the 95% confidence…

Q: What is the impact on the confidence interval estimate if a larger sample is used?

A: Confidence interval:

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A:

Q: How did the decisions from the hypothesis ?compare to whether or not the 95% or the 99% confidence…

A: Given: The null hypothesis has been rejected at 5% significance level. The null hypothesis has not…

Q: If 73.3% of the 45 students in our class are under the age of 20, find the 95% confidence interval…

A: Given, p = 0.733 n = 45 1 - α = 0.95α = 0.05α2 = 0.025     To find, 95% confidence interval for the…

Q: In a survey with human resources managers, 71% of respondents thought they should hire new staff…

A: Given information: Denote the population proportion of all respondents who thought that they should…

Q: What can we do to make a confidence interval narrower without changing the confidence level?

A: Confidence interval:  A range of values such that the population parameter can expected to contain…

Q: CBS News/New York Times poll used a convenience sample to survey 75 Americans and found that 61…

A: We know that there are two conditions that should be met before determining the confidence interval…

Q: What should your sample size be if you want a confidence level of 90 percent and a margin of error…

A: We want to find the sample size (n)

Q: In a recent polI, 200 people were asked if they liked dogs, and 15% said they did. Find the margin…

A: From the provided information, Sample size (n) = 200 15% people said they like dogs that is p̂ =…

Q: There is an ever-increasing number of sources of getting the daily news - traditional newspapers,…

A:

Q: if for some reason it was not possible to obtain the 99% confidence interval from SPSS, how could…

A: Given information: Confidence level=99%=0.99α=1%=0.01

Q: What proportion of college students earn their undergraduate degrees in four years? A college…

A: The formula of the margin of error when the limits given are,

Q: You drop by your local independent coffee shop on your way to class. While standing in​ line, you…

A:

Q: A magazine provided results from a poll of 1000 adults who were asked to identify their favorite…

A:

Q: Alma is estimating the proportion of students in her school district who, in the past month, read at…

A: From the given information, n=50 and x = 32.

Q: What is A confidence interval for μ?

A:

Q: Why is a 99% confidence interval wider than a 95% confidence interval?

A: The confidence interval formula is sample statistic±Margin of error. The margin of error is the…

Q: A political candidate has asked you to conduct a poll to determine what percentage of people support…

A: Given Information:  Margin of error (e) = 10%  Confidence level = 90%  The z score at 90% confidence…

Q: if you increase the sample size and confidence level at the same time. what will happen to the width…

A: The formula for the confidence interval (say) for population mean is :  C.I= x ± zα/2.s2n As the…

Q: Suppose we know that a confidence interval for a population proportion is (0.572, 0.662), with a…

A:

Q: What is the difference between the different confidence interval formulas?

A: Confidence interval is the estimate of the interval of an unknown population parameter. It provides…

Q: A study was being done to estimate the proportion of students who receive financial aid. If the…

A:

Q: 1. How can you make a 95% confidence interval smaller without changing the confidence level?

A: Confidence interval is an interval such that the probability of the unknown parameter to be included…

Q: ) In a Gallup poll, 1011 adults were asked if they consume alcoholic beverages and 64% of them said…

A: 11. Given information: The sample size is 1011 adults. 64% of them said that they did. That is,…

Q: The pizza Shop wanted to determine what proportion of its customers ordered an only cheese pizza.…

A:

Q: Would represent a 90% confidence interval for the average highway mileage of all Smart Cars?

A: we need to find the confidence interval of the mean GIVEN mean=47 S.D=5 n=15

Q: A Gallup poll of 1487 adults showed that 43% of the respondents have Facebook pages.  Construct a…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

Q: How can a confidence interval be used to test a hypothesis?

A: How can a confidence interval be used to test a hypothesis?

Q: The Pizza Shop wanted to determine what of its customers ordered an only cheese pizza. Out of 90…

A:

Q: Wisconsin Public Radio wants to duplicate a survey conducted in 2011 that found that 68% of adults…

A: From the provided information, Sample proportion (p̂) = 0.68 The z critical value at 90% confidence…

Q: A magazine provided results from a poll of 1500 adults who were asked to identify their favorite…

A: Given Information: Sample size n=1500 Sample proportion p^=0.13 Margin of error E=3%=0.03 The higher…

Q: A magazine provided results from a poll of 500 adults who were asked to identify their favorite pie.…

A: From the provided information, Sample size (n) = 500 Sample proportion (p̂) = 0.11

Q: A magazine provided results from a poll of 500 adults who were asked to identify their favorite…

A: It is given that the sample size is 500.

Q: A sociologist is comparing the proportion of teenage boys who receive a text message at least once…

A: The  Conditions for the Confidence interval for the difference in population proportions • Samples…

Q: What is the formula for CONFIDENCE INTERVAL (CI) FOR μ1 – μ2 (TWO INDEPENDENT SAMPLES)?

A: From the given information, consider two independent samples drawn randomly with sample sizes n1 and…

Q: Suppose you compute a confidence interval with a sample size of 37. What will happen to the…

A: If the sample size increases from 37 to 70 then, the margin of error of the confidence interval…

Q: How can you make a 95% confidence interval smaller without changing the confidence level?

A:

Q: If a retailer would like to estimate the proportion of their customers who bought an item after…

A: Solution: 3. From the given information, confidence level is 0.90 and E=0.03.

Q: The Pizza Shop wanted to determine what proportion of its customers ordered an only cheese pizza.…

A:

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.