You are planning a survey of stating salaries for recent computer science majors. In a recent survey by the National Association of Colleges and Employers, the average starting salary was reported to be $61,467. If the standard deviation is known to be $12,000, what sample size do you need to have a margin of error equal to $1000, with 95% confidence?

Q: A social service agency plans to conduct a survey to determine the mean income of its clients. The…

A: Population standard deviation, Margin of error, No, we do not need an estimate of the current mean…

Q: Micheal invested $2000 in a certain stock. At the end of the year the stock could be worth $1600,…

A: Given: Micheal invested $2000 in a certain stock. At the end of the year the stock could be worth…

Q: Ryanair charges a mean base fare of $59. In addition, the airline charges for checking in at the…

A: The population standard deviation of total flight cost is known to be $25. An average $39 per…

Q: A random sample of 54 four-year-olds attending day care centers provided a yearly tuition average of…

A:

Q: Over the break, you do some reasearch. In a random sample of 250 U.S. adults, 56% said they ate…

A:

Q: Dr. Samwell Tarly wants to estimate the number of books checked out of the library in the past year.…

A: It is given that the mean is 10,000 and the standard deviation is 10.

Q: A research firm conducted a survey to determine the average amount of money consistent smokers spend…

A: We have given that,  Let X be a random variable from normal distribution with mean(μ) = 20 and…

Q: In a survey, 28 people were asked how much they spent on their child's last birthday gift. The…

A: Given: n=28 standard deviation s = $5 confidence level = 98%

Q: Suppose you are an auditor, wishing to estimate the true mean dollar amount of a company’s accounts…

A:

Q: you investigate the earnings of a financial advisor in a wealth management company. they earn on…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: What changes the width of a confidence interval? A marketing director wants a 95% confidence…

A: Confidence interval is the range of values  and it contains the true population parameter with in…

Q: You are looking into selling prices of Subaru Outback from a website where users report their…

A: Formula :

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: The result of the survey is roughly bell-shaped. So, we assume that the population is approximately…

Q: A dataset that contains credit card balances has a population mean of $2870 and a population…

A: Given,mean(μ)=2870standard deviation(σ)=900sample size(n)=81

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A: given data,  bell- shaped distributionμ=33σ=2n=30CI=0.99α=1-0.99=0.01 margin of error for the data=?

Q: You are told that a survey produced a 90% confidence interval for the mean spent on utilities per…

A:

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: We have to construct ci.

Q: You plan to conduct a survey to find out the proportion of students who enjoy taking classes…

A: Given  The margin of error is given as m=0.02 At a 90% confidence interval, α=0.1 As the proportion…

Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

A:

Q: Explain the term "deviation scores"?

A:

Q: Humber's Financial Services Program is offering a post-diploma program, Securities and Investments.…

A: The scores on the admission test are normally distributed with a mean score of 146 and a standard…

Q: How would you explain conducting a scatter graph to someone who has never heard of correlation (but…

A: Scatter graph is a graph that is drawn to visualize the relationship between two variables ,x and y,…

Q: In a survey, 24 people were asked how much they spent on their child's last birthday gift. The…

A: The sample size is n=24 mean is =39 the standard deviation is =3.The confidence level is 95%, then…

Q: In the question below, do 50 minutes imply the mean of the population or the mean of the sample?…

A: The derived numerical characteristic that explains the average (or mean) at the population level can…

Q: A diet clinic states that there is an average loss of 24 pounds for those wh weeks. The standard…

A: A diet clinic states that there is an average loss of 24 pounds and standard deviation is 5 pounds.…

Q: An economist uses the price of a gallon of milk as a measure of inflation. She finds that the…

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

Q: In a survey, 20 people were asked how much they spent on their child's last birthday gift. The…

A: Given that  Sample size n =20 Sample mean=37 Standard deviation =7

Q: A housing survey was conducted to determine the price of a typical home in Topanga, CA. The mean…

A: The objective of this question is to find the probability that the mean price of 60 randomly chosen…

Q: The length of gestation for hippopotami is approximately Normal, with a mean of 269 days and a…

A: Given Mean=269 Standard deviations=7

Q: Song length varies from genre to genre. Brian wonders if there is a difference in the length of…

A: Answer:- Given, For Country songs  Sample size, n1 = 50 , Sample mean ,X̄1 = 3.44 minutes and…

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A: Given ,Sample size n = 30Sample mean x = 36Sample standard deviation (s0 =2d.F = n-1dF = 30-1 =…

Q: State the equation for the 95% confidence interval?

A: The equation for confidence interval can be stated as: Here x̅ is the sample mean, Zα/2 is the…

Q: Why is it useful to know the standard error of the mean? (Choose all that are correct.) It is…

A: here we know that Standard error is the standard deviation of its sampling distribution. or an…

Q: a survey, 16 people were asked how much they spent on their child's last birthday gift. The results…

A:

Q: Suppose that we know that 33.8% of the people born in the United States between 1936 and 1951 have…

A:

Q: Will exactly half of the observations in a sample fall below the mean? If answer is no, give a…

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

Q: The Department of Early Learning sets rules for childcare in Washington State. They are interested…

A: Solution: From the given information, confidence level is 0.95, σ=$1.40 and E=$0.50.

Q: A recent study found that 69% of all adults over 50 wear sunglasses for driving. In a random sample…

A: Formula : Mean = np Standard Deviation  :

Q: In a survey, 10 people were asked how much they spent on their child's last birthday gift. The…

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.