In a random sample of 20 people, the mean commute time to work was 34.9 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 80% confidence interval for the population mean μ. What is the margin of error of μ? Interpret the results. The confidence interval for the population mean u is (Round to one decimal place as needed.) C

Q: pregnancy length in days for a population of new mothers can be approximated by a normal…

A: Given, The pregnancy length in days for a population of new mothers can be approximated by a normal…

Q: The manufacturer of a new eye cream claims that the cream reduces the appearance of fine lines and…

A: Given data: Considering each individual subject was measured for the no. of fine lines and wrinkles…

Q: a) Calculate an estimate for the mean of the waiting times, by using an appropriate approximation to…

A: Here waiting time of the 128 customers is given. Waiting time f 0-30 29 30-60 17 60-90 17…

Q: Suppose the mean cholesterol levels of women age 45-59 is 5.2 mmol/l and the standard deviation is…

A: Given that.   X~N( μ , ?)   μ=5.2 , ?=0.7   Z-score =( x - μ )/?

Q: Find the mean of the following frequency table: X          f 2          1 3          5 4…

A: Answer  Given  X          f 2          1 3          5 4          1 5          1 6          0 7…

Q: Safeway Foods is redesigning the checkout lanes in their supermarkets throughout the Midwest, and…

A: Suppose μ1, μ2 are the population means of checkout times of Design 1 and Design 2, respectively.

Q: The testing times for a group of college students were normally distributed with a mean of μ = 33…

A: given data normal distributionμ = 33σ = 2   empirical rule : approximately 68-95-99.7% data fall…

Q: able 2 gives the market value of a luxury sedan (in dollars) x years after its purchase. (Use 4…

A: Given information: The data for the market value of a luxury sedan, x years after its purchase is…

Q: Use the sample data and confidence level given below to complete parts (a) through (d). A drug is…

A: Givensample size(n)=4873x=177confidence level=99%

Q: Perform a Correction t-test. Test if p = 0 at the 10% level of significance using a two-sided test,…

A:

Q: Find the area of the shaded region under the given normal distribution, which has mean standard…

A: As per our company guidelines we are supposed to answer only single question. Kindly repost other…

Q: Use the sample data and confidence level given below to complete parts (a) through (d). A drug is…

A: Given  n=4873 x=177 99% confidence interval   ⇒  α  = 1 –0.99 = 0.01 Now,  Z_{alpha/2}    ⇒    P(Z…

Q: The SAT scores have an average of 1,200 with a standard deviation of 200. A sample of 64 scores is…

A: given data μ = 1200σ = 200n = 64here n> 30as per CLT sampling distribution will be normal

Q: According to a government agency, 13.3% of the population of a certain country smoked in 2016. I…

A: Givenn=679x=78

Q: A population of N = 25 scores has ΣX = 40 and ΣX2= 120. For this population, what is the value of SS…

A: It is given that  N = 25 ΣX = 40ΣX2= 120

Q: In a population, a random variable follows a normal distribution with an unknown mean and a standard…

A: Given that  Sample size n =400 Sample mean=50 Population standard deviation =2

Q: In a normal distribution, what percentage of the values lie: 1. Below the mean? 2. Above the mean?…

A: Hi! Thank you for the question. As per the honor code, we are allowed to answer three sub-parts at a…

Q: The age of professional racecar drivers is normally distributed with a mean of 38 and a standard…

A: Since you have posted a question with multiple sub parts, we will provide the solution only to the…

Q: The price of iPhone 13 pro max is recorded at a random sample of 35 electronics stores in UAE. The…

A: We have given that 95% confidence interval for the population mean is (3154, 4112)

Q: The following data is a regression model where the U.S. Department of Transportation has tried to…

A: In this case, the independent variable is, the percentage of motorists under the age of 21 (x) and…

Q: Use the given confidence interval to find the margin of error and the sample mean. (12.3,20.7) The…

A: We have given that confidence interval CI = ( 12.3, 20.7 )

Q: Two marbles are drawn in succession from a box containing 10 red, 20 white, and 30 blue. Find the…

A: We have given that Number of red marbles = 10  Number of white marbles = 20  Number of blue marbles…

Q: In order to estimate the proportion of individuals who read at least one book per month, a random…

A: From given : Yes, I read at least one book per month. 490 No, I do not read at…

Q: 4. Suppose that Z~n(0,1) and that Y is an independent x²-distributed random variable with v df. Then…

A: Note: According to Bartleby. expert solve only one question and rest can be reposted

Q: What is the correlation between average monthly rainfall and crop yield in a given region over the…

A: 1).What is the correlation between average monthly rainfall and crop yield in a given region over…

Q: SAT scores in one state is normally distributed with a mean of 1532 and a standard deviation of 200.…

A: Given that, The random variable X is SAT scores in one state. It is normally distributed.…

Q: A random sample of 50 ladybirds of a particular species is collected, and the length of each…

A: Given that: Sample size, n=50 Sample mean, x¯=6.5 Sample standard deviation, s=2 Confidence…

Q: Q. A group of 625 students has a mean age of 15.8 years with a standard deviation of 0.6 years. The…

A: Given that, The random variable X is the age of the student It is normally distributed…

Q: Suppose ₁ and ₂ are true mean stopping distances at 50 mph for cars of a certain type equipped with…

A: Given that  Sample size n1=9 , n2=9

Q: In a study, the data you collect is miles per gallon of cars. Is this data quantitative or…

A: Here the given statement is In a study, the data you collect is miles per gallon of cars. Is this…

Q: IQ scores are known to be normally distributed with a mean of 100 and a standard deviation of 15.…

A: Given, Mean = M = 100 Standard deviation = S =15   The objective is to find the probability that a…

Q: QUESTION 29 Employees in a company experience distractions (phone calls, emails, unscheduled visits…

A: GivenMean(μ)=65standard deviation(σ)=15sample size(n)=25

Q: A rugby team from the country of Atlantis is formed by randomly drawing from its population. The…

A: Given that: Population mean, μ=165 Population standard deviation, σ=10 Size of sample, n=26

Q: Suppose that at a large university 30% of students are involved in intramural sports. If we randomly…

A: Solution

Q: If a population has a mean of 2.5, what is the mean of the sampling distribution if the sample size…

A: Introduction: It is required to find the mean of sampling distribution of the mean, when a sample of…

Q: perform better on the golfing test using the new method as compared to the traditional teaching…

A: The data is given in the form of the table .

Q: Suppose you have a bag containing 10 red balls, 8 blue balls, and 6 green balls. If you draw 2 balls…

A: It is given that the no. of balls of the colors red, blue, and green are 10, 8, and 6 respectively.…

Q: 5. State the decision rule (the rejection region) that would be used to test the following…

A: 6 a) Given Information: Null Hypothesis H0:μ=230 Alternative Hypothesis H1:μ<230 Significance…

Q: A study compared three display panels used by air traffic controllers. Each display panel was tested…

A: Given information: The ANOVA output is given.

Q: Can you show me how to solve the question above in excel please?

A: null and alternative hypothesis H0:μ=0H1:μ≠0

Q: income higher than $48,349. Identify whether each of the following five statements is true or false.…

A: The required answers to the question asked is as in steps below.

Q: We know that 65% of all Americans prefer chocolate over vanilla ice cream. Suppose that 1000 people…

A: Givenpercentage of americans prefer chocolate over vanilla(p)=65%=0.65sample size(n)=1000

Q: Solve the problem. A final exam in Math 160 has a mean of 73 with standard deviation 7.8. If 24…

A: Given that.   X~N( μ , ?)   μ=73 , ?=7.8  , n=24   Z-score =( x - μ )/?

Q: In how many ways can 6 questions be selected out of 10? (We do not care about the order)

A: Answer  Given  how many ways 6 questions can be selected out of 10 is:  P [n, x] =[n!]/[x![n-x]! P…

Q: LeRoy, a starting player for a major college basketball team, made only 40% of his free throws last…

A: From the provided information, Sample size (n) = 40 From which LeRoy made 25 free throws. Sample…

Q: Find the margin of error for the given values of c, o, and n. c = 0.90, o = 3.6, n = 81 Click the…

A: From given : c=0.90σ=3.6n=81

Q: In a survey from a certain year, the range of annual salaries reported was from $73,187 to $336,550.…

A: Given:  The data of CEO salaries of the two populated states California and Texas is provided below:…

Q: A particular fruit's weights are normally distributed, with a mean of 323 grams and a standard…

A: given data, normal distributionμ=323σ=5we have to find out the given probabilties.

Q: statistics professor plans classes so carefully that the lengths of her classes are uniformly…

A: Given,A random variable X~U(50,52)f(X)=12     ;   50≤X≤52

Q: A. What exponential equation, V(x) best fits the data, where x is the number of years after purchase…

A: Note that I used R software for calculations. Since B and D are right, I'll answer only A and C.