A personnel director in a particular state claims that the mean annual income is greater in one of the​ state's counties​ (county A) than it is in another county​ (county B). In County​ A, a random sample of 15 residents has a mean annual income of 40300 and a standard deviation of 8900. In County​ B, a random sample of 8 residents has a mean annual income of  37800 and a standard deviation of 5800. At a=0.01 ​, answer parts​ (a) through​ (e). Assume the population variances are not equal. If​

Q: A random sample of 82 eighth grade​ students' scores on a national mathematics assessment test has a…

A: From given data we have : n=82 μ=280,σ=37

Q: The adult eastern hellbender (a type of giant salamander) has a length which is normally distributed…

A: GivenFor eastern HellbenderMean(μ)=30.3standard deviation(σ)=3For Ozark…

Q: A bottled water distributor wants to determine whether the mean amount of water contained in​…

A:

Q: A student at a four-year college claims that mean enrollment at four-year colleges is higher than at…

A: From the given data ,5466  ,  = 50688191  ,  477735      ,   35Significance level , 0.10

Q: In a national survey, middle school students report spending 3.1 hours per week on homework. Mr.…

A: μ=3.1n=24α=0.1σ=1.9x=3.4

Q: According to a research paper, the carbon monoxide exposure of someone riding a motorbike for 5 km…

A: From the provided information, Mean (µ) = 18.4 ppm Population standard deviation (σ) = 5.3 ppm X~N…

Q: In a random sample of 23 private school teachers in queens county the average teaching experience is…

A:

Q: A marketing researcher wants to estimate the mean amount spent per year​ ($) on a web site by…

A: The summary of statistics is,

Q: A fire department in a rural county reports that its response time to fires is approximately…

A: Consider that a random variable x, defines the response time to fires.

Q: A student at a four-year college claims that mean enrollment at four-year colleges is higher than at…

A: The following information has been provided: n1=35          n2=35x¯1=5466      x¯2=5068s1=8191…

Q: In a survey sample of 1000 respondents, the mean annual salary is $32,245, with a standard deviation…

A: Solution: Given information: n= 1000 Sample size  x= $32245  Sample mean  s=$4021.54  Sample…

Q: Assume the samples are random and independent and the populations are normally distributed. A marine…

A: Given problem is :   Assume the samples are random and independent and the populations are…

Q: According to the historical data, the life expectancy in Egypt is equal to the life expectancy in…

A: Given Information : According to the historical data , the life expectancy in Egypt is equal to the…

Q: A researcher claims that the standard deviation of the number of deaths annually from typhoons in…

A:

Q: According to the historical data, the life expectancy in Egypt is equal to the life expectancy in…

A: Let us consider population 1 as Egypt and population 2 as Morocco.

Q: A marketing researcher wants to estimate the mean amount spent per year​ ($) on a web site by…

A: Let, X = Amount spent per year​ ($) on a web site by membership member shoppers. Given that;…

Q: n a randomly selected sample of women ages 20-34, the mean total cholesterol level is 188 milligrams…

A:

Q: Steve believes that his wife’s cell phone battery does not last as long as his cell phone battery.…

A: Method By using the 90% confidence level to construct a confidence interval.

Q: he mean score of an Insurance Licensure Examination is - vith a standard deviation of 4. a. Using…

A: Given data,Mean μ=48sd     σ=4Using Chebyshevs Theorm, Find lower range for which atleast 75% of…

Q: For a random sample of 90 overweight men, the mean number of pounds that they were overweight was…

A:

Q: Assume that credit card FICO scores are normally distributed. A sample of 18 individuals was taken…

A: Given: Sample size (n) = 18 Sample mean (x̄) = 660.3 Sample standard deviation (s) = 95.9 The level…

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 64.7 inches.…

A: Given that: X is normal Distributed with mean µ = 64.7 and standard deviation σ = 2.88 By using…

Q: An insurance company wants to know if the average speed at which men drive cars is greater than that…

A:

Q: The accounts of 4,500 credit card customers out of a sample of 40,000 that were reviewed did not…

A: The sample size of review credit card customers: The number of unsatisfactory performers from the…

Q: Steve believes that his wife's cell phone battery does not last as long as his cell phone battery.…

A:

Q: A personnel director in a particular state ciaims that the mean annual income is greater in one of…

A: Country A : Sample size , n = 17. Sample mean , x̅ = $41,000. Standard deviation , s = $8100.…

Q: A marketing researcher wants to estimate the mean amount spent per year ($) on a web site by…

A: Given values, n=100x¯=60s=55

Q: At Pacific Freight Lines, bonuses are given to billing clerks when they complete 300 or more freight…

A: Given information Mean µ = 270 Standard deviation σ = 16 proportion of the time should a randomly…

Q: A marketing researcher wants to estimate the mean amount spent per year ($) on a web site by…

A: The sample size is 130, sample mean is 58, and sample standard deviation is 53.

Q: The 2008 General Social Survey asked a large number of people how much time they spent watching TV…

A: According to the given question, The 2008 General Social Survey asked a large number of people how…

Q: The combined SAT scores for the students at a local high school are normally distributed with a mean…

A:

Q: Assume a recent sociological report states that university students drink 4.10 alcoholic drinks per…

A: Determine the mean and standard deviation of the sampling distribution of the sample mean alcohol…

Q: uppose a researcher wants to test if the average diastolic blood pressure in Irish-Americans is…

A: Given data,n=30Population mean μ=70sample mean is x=73sd is s=3test statistic t=?

Q: Assume a recent sociological report states that university students drink 5.70 alcoholic drinks per…

A:

Q: he seasonal output of a new experimental strain of pepper plants was carefully weighed. The mean…

A: normal distribution ,μ=17σ=1.75n=200p(13<X<16)=?

Q: (a) Identify the claim and state Hg and H, What is the claim? O A. The wind speed in Region A is…

A: Given:  The mean wind speed in region A,x¯1=13.7Population sd for region A, σ1=2.8The mean wind…

Q: Steve believes that his wife's cell phone battery does not last as long as his cell phone battery.…

A: The pooled variance is 28.2841.The degrees of freedom is,

Q: Assume the average amount of caffeine consumed daily by adults is normally distributed with a mean…

A: The detailed solution is as follows below:

Q: A student at a four-year college claims that mean enrollment at four-year colleges is higher than at…

A: Solution To test the hypothesis we will use t distribution.

Q: A student at a four-year college claims that mean enrollment at four-year colleges is higher than at…

A: Null and Alternative Hypothesis:H0 : pF = pTH1 : pF > pT Test statistict =…

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: