Suppose x has a distribution with ? = 20 and ? = 14.  If a random sample of size n = 73 is drawn, find ?x, ? x and P(20 ≤ x ≤ 22). (Round ? x to two decimal places and the probability to four decimal places.) ?x =  ? x =  P(20 ≤ x ≤ 22) =

Q: (a) A number of Japanese black pine tree seedlings were planted in a rather inaccessible location to…

A: Given Information: Consider the resulting data that comprise the height of the young trees which is…

Q: Kelly created a simulation of how many times her soccer player would score a goal in a game. She…

A: Statement: Kelly created a simulation of how many times her soccer player would score a goal in a…

Q: For question 4,  Using the actual Year-3 numbers check your forecast accuracy, by calculating CFE,…

A: month demand Jan 212 Feb 245 Mar 252 Apr 376 May 757 Jun 404 Jul 354 Aug 324 Sep…

Q: The maximum acceptable level of a certain toxic chemical in vegetables has been set at 0.4 parts per…

A: Suppose μ is the population mean level of the chemical in tomatoes from the producer.

Q: A study found that the mean amount of time cars spent in drive-throughs of a certain fast-food…

A: Given,mean(μ)=142.6standard deviation(σ)=25

Q: Refer to the accompanying data display that results from a sample of airport data speeds in Mbps.…

A: Given: n = 50 X = 17.598 sx = 16.01712719 Formula Used: df = n-1

Q: The quality control department has collected data on defective products produced over a 24-hour…

A: For the given data Perform t test for one population mean

Q: Claim: The mean pulse rate (in beats per minute) of adult males is equal to 69 bpm. For a random…

A: given data  claim : μ = 69 n = 151 x¯ = 67.9 s = 11.2 test statistic = ?

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A: From the provided information, Sample size (n) = 6 Population standard deviation (σ) = 2 inches…

Q: During the independent research 90 women were chosen to measure their weight. The mean value of…

A:

Q: The inflammation caused by osteoarthritis of the knee can be very painful and can inhibit movement.…

A: Given that: Leech (Group 1): x¯1=52.4s1=13.9n1=24 Topical gel (Group 2): x¯2=52s2=16.6n2=27

Q: The following table represents persons with secondary education (%) and persons with tertiary…

A: Sturge's formula for the number of classes is given by: k=1+3.322 log N where k= number of classes…

Q: Problem 4) Continuous random variable X has the following PDF: -1≤x≤3 fx(x) = otherwise = Define the…

A:

Q: Heights of men aged 25 to 34 have a standard deviation of 2.9. Use a 0.05 significance level tor…

A:

Q: Using the following information select the number that better estimates the upper 90% confidence…

A:

Q: The life in hours of a battery is known to be approximately normally distributed, with standard…

A:

Q: Suppose the mean height in inches of all 9th grade students at one high school is estimated. The…

A: Given data is66,61,75,62,61,70,65,62,61sample size(n)=9standard deviation(σ)=2confidence level=90%

Q: 3) The Tire Rack, an online distributor of tires and wheels, conducts extensive testing to provide…

A: The level of significance is α=0.01. Given data: Tread Wear Dry Traction Steering Buy Again 8.6…

Q: You are given the following data, which you intend to model as a Poisson distribution. Data value 0…

A: The pdf of Poisson distribution is, Px=e-μμxx! The mean is computed as follows:…

Q: t of standard residuals on the predicted values. Are all four regression assumptions satisfied?

A: Assumption are verified for the regression about the data, such as : Linearity of the data. The…

Q: Construct the indicated confidence interval for the population mean y using the t-distribution.…

A: given data  c = 0.95 α = 1 - 0.95 = 0.05x¯ = 14.3s = 0.83n = 18

Q: Assume that a simple random sample has been selected from a normally distributed population. Find…

A: given data n = 16x¯ = 84.5s = 11.2α = 0.01claim : μ = 80

Q: The probability that it snows in a particular city on any given winter day is 13%. What is the…

A: Given that the probability that it snows in a particular city on any given winter day is 13%. Let,…

Q: QUESTION 1: Fifty women were asked which of the following gift items they prefer as a birthday…

A: Frequency distribution table:  We count the frequency every gift item and create table.  Gift…

Q: Statistics students in Oxnard College sampled 11 textbooks in the Condor bookstore and recorded the…

A:

Q: ing three independent ndom samples normally distribut populations with equal variances. The…

A: Given information for Workshop study: The sample size is n1=15. The sample standard deviation is…

Q: A tire manufacturer wants to ensure that the tires produced are of a consistent quality so that…

A: Solution : Given that, confidence level=90% 1-α=0.90α=0.10 n=12 now degrees of freedom df=n-1…

Q: QUESTION 1: Fifty women were asked which of the following gift items they prefer as a birthday…

A: We count the frequency of every gift item and create frequency distribution table: Gift item…

Q: Assume that a hypothesis test of the given claim will be conducted. Identify the type I or type II…

A: The claim is that the proportion of Americans that have seen a UFO is less than 1 in a thousand.

Q: Company XYZ knows that replacement times for the mircowaves it produces are normally distributed…

A: GivenMean(μ)=15.3standard deviation(σ)=1.3

Q: The weight of 45 watermelons from a farm is shown below. Weight Frequency 11-15 4 16-20 8 21-25 13…

A: According to the given information in this question There are more than three subparts according to…

Q: Researchers are testing shoes for comfort. They recruit more than 750 adults and randomly assigned…

A: Given: About 750 adults are recruited. Half of them are randomly assigned to a name-brand shoe.…

Q: The amounts of nicotine in a certain brand of cigarette are normally distributed with a mean of…

A: Given Mean=0.908 Standard deviations=0.318

Q: Suppose that a company manufactures a tire with a lifetime that approximately follows a normal…

A: Here, mean is 70000 standard deviation is 4400. We will use z standard normal distribution.…

Q: Model Variables Entered/Removedª Variables Removed Method Enter Variables Entered Model Distance in…

A: There are 2 variables. ‘Value of monthly sales in $k in 2007’ is dependent variable (Y) and…

Q: Q1: Placebo effect of exercise In a high-profile research study, Crum and Langer (2007) performed an…

A: It is interpreted that, the test involves, 44 subjects in each of the groups, i.e., the treatment…

Q: The trade magazine QR routinely checks the drive-through service times of fast-food restaurants. A…

A: Given: Confidence level = 99% n = 719 Confidence interval = (159.1,  162.1) Formula Used: Margin of…

Q: A service provider has 2 outlets. The price for a service in each outlet is €10. The chart below…

A:

Q: A hypothesis test of the null hypothesis μ-135 yields a z-test statistic of 1.05. What is the…

A:

Q: In a pastry shop in a small town, the probability that a customer buys apple tarts is 0.45, the…

A: As per our guidelines we are suppose to answer only one question kindly post the next questions in…

Q: Statistics students in Oxnard College sampled 11 textbooks in the Condor bookstore and recorded the…

A: From the given information we make the following table Number of pages (x) Cost (y) x2 y2 xy…

Q: Using the following information select the number that better estimates the upper 90% confidence…

A: From given data we have : Observation Date xi 1 79 2 78 3 85 4 79 5 79 6 78 7 76…

Q: A researcher claims that exactly 40 % of all adults in the U.S. use their cell phone for most of…

A: The question is about hypo. testing and confidence interval Given : Popl. prop. of all adults use…

Q: use Excel to find a 99% confidence interval for the additional sleep that would be obtained on…

A: The number of observations is 10.

Q: roblem 1) If Y' is an exponential random variable with Var[Y]-25, find the following: a) What is the…

A:

Q: fidence interval ion of imprisonment, u, of all East German political prisoners wi chronic PTSD. a.…

A: Given Given Sample size (xbar) =36.2 Population standard deviation=42

Q: Test the claim that the proportion of college students who are vegetarians is less than 31%. A…

A: Givensample size(n)=1000sample proportion(p^)=0.277significance leve(α)=10%=0.10

Q: 5. A student plans to go sledding on the first snow day in December. The chance of snow on any given…

A: The given problem can be solved using the binomial distribution.  The formula of variance for…

Q: A survey was conducted that asked 1007 people how many books they had read in the past year. Results…

A: given data, n=1007df=n-1=1007-1=1006x¯=13.3s=16.6CI=0.99α=1-0.99=0.01we have to find out the…

Q: You conduct a simulation regarding students' scores on an English test. Your null hypothesis is that…

A: Given   Population mean μ=88