Studies show that massage therapy has a variety of health benefits and it is not too expensive. A sample of 10 typical one-hour massage therapy sessions showed an average charge of 58. The population standard deviation for a one-hour session is =55 . a. What assumptions about the population should we be willing to make if a margin of error is desired?   b. Using 90% confidence, what is the margin of error (to 2 decimals)?   c. Using 99% confidence, what is the margin of error (to 2 decimals)?

Q: A health care prifessional wishes to estimate the birth weights of infants. How large a sample must…

A: Given Information :  A health care professional wishes to estimate the birth weights of infants. He…

Q: You are conducting an experiment to examine the anxiety levels of a group of Psychology students.…

A:

Q: a. 90% confidence? (Your answer should be a whole number) b. 95% confidence? (Your answer should be…

A: It is given that  Margin of error, E = 20 Sgandard deviation = 70   Note: According to Bartleby…

Q: At McMeck High School they decided to calculate the average GPA of all 950 students.  The average…

A:

Q: You are estimating the mean size of farms in New Hampshire.  You want your 95% CI to have a margin…

A: The formula for the sample size is as follows:

Q: Below are the range and standard deviation for a set of data. Use the range rule of thumb and…

A:

Q: In a survey of 1000 people, mean amount of money they spend on buying Starbuck’s coffee per month is…

A: Solution: a. Let X be the amount of money. From the given information, n=1000, x-bar=19.40, Z=1.96…

Q: study was done to look at the relationship between umber of vacation days employees take each year…

A: If p<α , there is significant differenceg)y = -0.62334X + 7.87268, at x=2y(sick days)=6.6=7

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A:

Q: The GPAs of high school students that applied to a University last year follow a normal…

A: Let Y be the GPAs of high school students that applied to a University last year. Y~Nμ=3.2,σ Where,…

Q: The margin of error is 6, with a sample standard deviation of 20 and 92% level of confidence. Step…

A: As the population mean is estimated on the basis of sample mean, there must be some error in…

Q: A market researcher wants to estimate the amount of money that a Christmas shopper will spend on…

A: We have to find sample size for given data..

Q: Dr. Hill, a physical therapist, compared the average length of office visits for his male and female…

A: Here, mean1 is 5.9 and mean2 is 6.3. Standard deviations are 2.2 and 1.7. Sample numbers are 7 for…

Q: How large a sample is required for you to be 95% sure that the estimate of the mean invoice is…

A: Answer: From the given data, Confidence level = 95% ⇒c = 95% = 0.95 Margin of error (E) = 3…

Q: You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Margin of error=1.5 Population standard deviations=31.6 Critical value =1.645

Q: We would like to estimate the mean amount a shopper spends during a visit to the local supermarket.…

A: 90% confidence interval for meanMargin of error : E = 2.50Population standard deviation : Required…

Q: Given Information: Sample Size (n)= 115 Sample Mean (x) 10.8 Sample standard deviation (s) = 1.13 a.…

A: Given that the 98% and 80% confidence interval is calculated for the population mean, we have to…

Q: parent would spend on their child's birthday gift (use a 99% confidence level). Give your answers to…

A:

Q: 4. An airline claims that the average number of years of experience of its pilots is at least 18.3.…

A: Given data  Population mean μ=18.3, n=sample size=20, sample mean x̄=17.4, s=3, level of…

Q: What raw score is needed to be in the bottom  28%? A group of students take a exam and the adverage…

A: Given that, For a normally distributed random variable, X with mean μ, and standard deviation σ, the…

Q: Nationally, patients who go to the emergency room wait an average of 4 hours to be admitted into the…

A: From the provided information, Sample size (n) = 11 Sample mean (x̅) = 2.7 Standard deviation (s) =…

Q: You are interested in determining the mean amount of dollars that employees at your company spend on…

A: Solution: From the given information, confidence level is 0.90, σ=1 and E=300.

Q: you want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based…

A: Population standard deviation =56.3Margin of error =E =1

Q: An engineer wishes to determine the width of a particular electronic component. If she knows that…

A: σ=3.7,E=0.3,C.I=90%

Q: A study has been conducted of the airspeed of various bird species. You would like to specify the…

A:

Q: For a mean of 70 and a standard deviation of 8, find standardized score for a value of 80. O - 1.25…

A: From the provided information, Mean (µ) = 70 Standard deviation (σ) = 8

Q: You need to estimate the mean number of travel days per year for sales people. The mean of a small…

A: Given that : Standard deviation σ = 12 days Margin of error (E)= 3 We have to find 80% confidence…

Q: A market researcher wants to estimate the amount of money that a Christmass hopper will spend on…

A:

Q: You work for a consumer advocate agency and want to estimate the population mean cost of replacing a…

A: According to bartleby expert guidelines we can answer only first three subparts. Rest can be repost.

Q: 6. Data from the Nati indicates that the mean price of a home in Denver, from April through June of…

A: Ti 83/ 84  command  STAT > TESTS > Z-TEST >Stats > enter the data  (I have provided you…

Q: A medical statistician wants to estimate the average weight loss of people who are on a new diet…

A: Given,standard deviation(σ)=8margin of error(E)=2α=1-0.94=0.06α2=0.03Z0.03=1.8808       (from…

Q: 2. All Grade 6 students are required to take the NAT. Suppose the mean for the mathematical aptitude…

A: Let X be the math score that follows normal distribution with mean (μ)=25 and standard deviation…

Q: A researcher named liza wants to estimate the mean age of pilots in an airline company. The…

A: Given: σ=6.30Length of the interval=3.2

Q: We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers…

A: The sample size must be equal to 9375.Explanation:Step 1: List the given values as provided in the…

Q: Consider again the birth weights of newborn babies, where the mean weight is 3290 grams and the…

A: From the provided information,Mean (µ) = 3290Standard deviation (σ) = 520X~N (3290, 520)

Q: The average number of strawberries that come in a pint is 27.9, with a standard deviation of 7.8.…

A:

Q: Compute for the sample size if the margin of error is 15, with a sample standard deviation of 55 and…

A: We have given that the margin of error is 15, with a sample standard deviation of 55 and a 95% level…

Q: In this exercise, you will compare Chebyshev’s rule and the empirical rule. a. Compare the estimates…

A: a)The Chebyshev’s rule estimates at least 75% of observations lie within two standard deviations of…

Q: Duke Colleges wants to know the time in class they will execute on the upcoming school year. On…

A:

Q: We wish to estimate the mean pre-pregnancy weight of women using a 95% CI. We have a sample of 100…

A: Alpha = 1 - Confidence Interval               = 1 - 95%               = 1-0.95…

Q: You are conducting a study to see how much high school students spend on back to school shopping.…

A: Solution: From the given information, confidence level is 0.90, σ=60.7 and E=1.

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.