You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on constructing a confidence interval; however, you are not sure how many citizens should be included in the sample. If you want your sample estimate to be within 4 years of the actual mean with a confidence level of 97%, how many citizens should be included in your sample? Assume that the standard deviation of the ages of all the citizens in this community is 20 years.

Q: The General Social Survey asked: “How many e-mails do you send in a day?” The results of 928…

A: Given Information: Sample size (n) = 928 Sample mean (x¯) = 10.4 Standard deviation (s) = 28.5 To…

Q: How many more Tweets are students at Hempstead High School sending in 2017 than in 2012? The table…

A: If an interval is proposed as an estimate of the unknown parameter, then it is interval estimation.…

Q: If all other quantities remain the​ same, how does the indicated change affect the width of a…

A: Confidence Interval: It is a range of values in which the required population parameter can be in…

Q: a. The average IQ is 100, with a population standard deviation of 15. The mayor of Smartsville…

A:

Q: If you wish to estimate a population mean with a sampling distribution error SE = 0.28 using a 95%…

A:

Q: When constructing a confidence interval or testing a hypothesis regarding a population mean ?, which…

A:

Q: A sample of 200 corporate managers produced the mean job-related stress score of 7.9 with a standard…

A: It is given that,

Q: When calculating the confidence interval for a population mean, which distribution is used?

A: Confidence interval for mean: When the sample size is large (n>30) and population variance (or…

Q: In a survey, 18 people were asked how much they spent on their child's last birthday gift. The…

A: Given data in a survey 18 people were asked how much they spent on their child's last birthday gift.…

Q: How long is your commute to school? For a random sample 16 LaGuardia students, the mean commute time…

A: We have given that,  Sample mean (x̄) = 33, standard deviation  (s)=10 and sample size (n) = 16…

Q: You would like to construct a 95% confidence interval to estimate the population mean score on a…

A: (a)   Obtain the point estimate.   The value of the point estimate is determined below as follows:…

Q: Determine the sample size needed to construct a 95% confidence interval for the population mean, μ,…

A:

Q: SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An…

A:

Q: In a survey, 17 people were asked how much they spent on their child's last birthday gift. The…

A: Given information- Population mean, µ = $45 Standard deviation, σ = $11 Sample size, n = 17…

Q: The 2008 General Social Survey asked, “What do you think is the ideal number of children for a…

A: Given that,  n=678x¯=3.22s=1.99 The point estimate of the population mean is sample mean. That is,…

Q: If you were constructing a 95% confidence interval of the population mean based on a sample of n =…

A: Obtain the critical value of t. The critical value of t is obtained below: Obtain the degrees of…

Q: We often hear that the cost of looking after our aging population is rising. “Which”, the consumer…

A: The sample mean is given as 3486. Population standard deviation, sigma is 650. The sample size, n is…

Q: SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An…

A: We have to find sample size....

Q: In a survey, 17 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An…

A: It is given that the confidence level is 0.80, the population standard deviation is 300 and the…

Q: It is estimated that 40% of the world population has some sort of seasonal allergy. During autumn in…

A:

Q: The proportion of people changing residence in the USA each year is 0.165. A researcher believes…

A: Given: n=50 p0=0.165p⏜=0.24α=0.05

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: A bank officer wants to determine the amount of the average total monthly deposits per customer at…

A: Given,   Margin of error = 200 Standard deviation = 1000   Critical value: Using z-table, the…

Q: You would like to construct a 90% confidence interval to estimate the population mean score on a…

A: Given that the sample mean x¯ = 513 Sample standard deviation S = 76

Q: You would like to construct a 99% confidence interval to estimate the population mean time it takes…

A:

Q: Everything else being equal, a population with more variability yields a confidence interval that…

A: It is very useful in statistics . It has wide applications in all hypothesis testing problems .

Q: In a survey, 25 people were asked how much they spent on their child's last birthday gift. The…

A: As per given by the question, There are 25 people were asked how much they spent on their child's…

Q: In a survey, 15 people were asked how much they spent on their child's last birthday gift. The…

A: The sample mean is 32 and standard deviation is 14.

Q: You would like to construct a 90% confidence interval to estimate the population mean score on a…

A: a) Sample mean is best point estimate of population mean So best point estimate = 502.

Q: es. What is the upper bound of the 95% confidence interval for the average jump increase?

A: Sample mean  = 1.99 Sample standard deviation  = 0.92 n = 49

Q: 1) In an effort to estimate the mean amount spent per customer at Oliver's Eatery in Astoria,…

A: As per the honor code, We’ll answer the first question since the exact one wasn’t specified. Please…

Q: The average public high school has 468 students with a standard deviation of 87. Answer the…

A: As per our guidelines we are suppose to answer only one question. Let us assume sample…

Q: SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An…

A: Margin of Error: margin of error of a point estimate provides the extent of accuracy with which the…

Q: SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An…

A: It is given that confidence level is 0.96, population standard deviation is 300 and margin of error…

Q: or a sample of 121 that has a mean of 6540 and a standard deviation of 780, calculate the 90%…

A:

Q: SAT scores are normally distributed with a mean of 1,500 and a standard deviation of 300. An…

A:

Q: A sample of 45 households reveals that 23% have traveled overseas. Is this significantly different…

A:

Q: An economist is interested in studying the incomes of consumers in a particular country. The…

A: The population standard deviation = $1,000.Z value for 90% confidence interval is 1.645.Sample size…

Q: The National Assessment of Educational Progress (NAEP) includes a mathematical test for eighth-grade…

A: Solution: From the given information, µ=282 and σ=110. The confidence interval can be calculated by…

Q: In a random sample of 50 people, the mean body mass index (BMI) was 27.7 and the standard deviation…

A: given that,sample mean, x =27.7standard deviation, s =6.12sample size, n =50standard error = sd/…

Q: The average daily volume of a computer stock in 2011 was μ=35.1million​ shares, according to a…

A:

Q: Leo is considering adding Jet Skis to the amenities available for his hotel guests. He wants to get…

A: Leo is considering adding Jet Skis to the amenities available for his hotel guests. He wants to get…

Q: a researcher wishes to develop an interval estimate for response scores on user surveys. She's not…

A: Solution: From the given information, the scores have ranged from 25 to 86, the confidence level is…

Q: In a survey, 14 people were asked how much they spent on their child's last birthday gift. The…

A: It is given that sample mean is $30 and standard deviation is $20.

Q: You would like to construct a 95% confidence interval to estimate the population mean score on a…

A: Given: Sample mean is 511 Sample standard deviation is 71

Q: 1) In an effort to estimate the mean amount spent per customer at Oliver's Eatery in Astoria,…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: For a fixed sample size, what happens to a confidence interval for u when we increase the level of…

A: Here we need to determine whether the width of the confidence interval becomes narrower or wider…

Q: The average salary of 81 random employees in a certain financial sector was 3400 USD. From past…

A: Population standard deviation=450 Sample size =81

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.