Suppose a test is given to 20 randomly selected college freshmen in Ohio. The sample average score on the test is 12 points and the sample standard deviation is 4 points. Suppose the same test is given to 16 randomly selected college freshmen in Iowa. The sample average score on the test is 8 points and the sample standard deviation is 3 points. We want to test whether there is a significant difference in scores of college freshmen in Ohio versus Iowa. What is the point estimate for the difference in population means, where difference is defined as (Ohio minus Iowa)?

Q: The U.S. Center for Disease Control reports that in year 1900, the mean life expectancy is 47.6…

A: Given  nw=117, x¯w=46.7 and  sw=11.4 And           nnw=86, x¯nw=38.4 and  snw=15.4

Q: If the richest person in the world walks into a room with the 98 poorest people in the world, then…

A: Given: Richest person in the world has entered the room with other 98 individuals in the world

Q: For a population, the mean is 275 yards with a standard deviation of 73 yards. Determine the…

A: To determine the probability of a sample of 30 having a mean of 285 yards or lower, we can use the…

Q: Ermias and Trinidad began arguing about who did better on their tests, but they couldn't decide who…

A: given data Ermias  :   μ1 = 76.7     σ1  = 10.5       x1 = 76.5Trinidad  :   μ2 = 64.5     σ2  = 8.1…

Q: The election results were announced in a country. The number of seats in state Mozi had a mean of…

A:

Q: Imagine that every elementary school in California is measured on several characteristics and then…

A:

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

A: Given that  Sample size n =9 Population standard deviation =3

Q: Lindsey and Karen began arguing about who did better on their tests, but they couldn't decide who…

A: Lindsey (Art History) 70.7 9.4 81.1 Karen (Social Studies) 61 9.6 70.7 a) Calculate the…

Q: The National Sleep Foundation surveyed representative samples of adults in six different countries…

A: we have given that  n1=250 ,n2=250 ,xbar1=391 ,xbar2=426 ,s1=20 ,s2=44 alpha=0.05

Q: Imagine that every elementary school in California is measured on several characteristics and then…

A: For Carver:mean(μ)=10.1standard deviation(σ)=2.3and score (X)=13.2For Bryant:mean(μ)=9.8standard…

Q: Suppose that the distribution of touchdowns (in football) is normally distributed with a mean of 250…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: Malik and Landon began arguing about who did better on their tests, but they couldn't decide who did…

A: Given:   Malik (Art history) 75.1 10 71.1 Landon (Math) 66.5 9.1 71.8 Formula:

Q: an of sampling distribution of 24.49. Wha

A: Given, μx-=24.49

Q: Jacy and Bella began arguing about who did better on their tests, but they couldn't decide who did…

A: GivenJacy took a test in Math and earned a 78.2 Bella took a test in social studies and earned a…

Q: Suppose​ 18% of​ movie-goers say that horror is their favorite movie genre. If a random sample of…

A: Obtain the mean number of movie-goers that prefer horror movie genre. The mean number of movie-goers…

Q: The Queen decided to change the distribution of wealth in Arecima. With the help of the royal…

A: Given Information: The mean was increased from 100 to 120. The standard deviation was reduced from…

Q: Carla and Patrisse began arguing about who did better on their tests, but they couldn't decide who…

A: given data  carla: math testx1 = 77.7μ1 = 71.2σ1 = 10.1patrisse : english testx2 = 68.7μ2 = 64.1σ2 =…

Q: Suppose that the average length of American songs is 245 seconds with a standard deviation of 28…

A: Solution: Let X be the length of American songs. From the given information, X has mean µ=245…

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A: Let mean numbers of calls for Karen’s is µ1 and mean numbers of calls for Jodi’s is µ2.

Q: For admission to graduate school, Kira is taking the physics subject-matter test, and Donna is…

A: Given information- For Physics- Population mean, µ = 605 Population standard deviation, σ = 34 And…

Q: The results of a common standardized test used in psychology research is designed so that the…

A: Consider X be a random variable which follows normal distribution indicating the score earned on a…

Q: TRUE OR FALSE: A z-score indicates the number of standard deviations a data value is ab below the…

A: Standardized z-score: The standardized z-score represents the number of standard deviations the data…

Q: Pyramid Lake is en the Paiute andan Reservation in Nevada. The lake is famous for cuthreat trout.…

A: a)   Assume that μ is the true mean length of trout caught in Lake P.

Q: Rahquez and Jonah began arguing about who did better on their tests, but they couldn't decide who…

A: Rahquez took a test in Social Studies and earned a 78Jonah took a test in Math and earned a 70.4The…

Q: Juwan and Aaron began arguing about who did better on their tests, but they couldn't decide who did…

A:

Q: If a set of exam scores forms a symmetrical distribution, what can you conclude about the students’…

A: The set of exam scores forms a symmetrical distribution.

Q: students has an average of 300 dollars and a standard deviation of 1,000. Suppose that we take a…

A: It is given that the random variable X i.e, the amount of money in savings accounts follow normal…

Q: A nursery sells trees of different types and heights. These trees average 50 inches in height with a…

A: The problem is asking us to find the standard deviation for the sample mean. In statistics, the…

Q: Two players, Fredo and Karl, on different teams wanted to find out who scored the higher number of…

A: From the given information, Player His Average Points Other Average Points Other Standard…

Q: Suppose that we will randomly select a sample of 64 measurements from a population having a mean…

A: From the provided information, Mean (µ) = 20 Standard deviation (σ) = 4 X~N (20, 4)

Q: A researcher collected data on the palate length of 50 individual shrews of the same species.. She…

A: In this question, a researcher has collected data on the palate length of 50 individual shrews of…

Q: Salomé and Latasha began arguing about who did better on their tests, but they couldn't decide who…

A: Salome's test grade: Mean = 73.7 , Standard deviation = 10 Social studies = 80.8 Latasha's test…

Q: The variance of a sample of 169 observations equals 576. what is the standard deviation of the…

A: Variance of a sample(s2)=576sample size(n)=169

Q: Woodland and Clear Beach are schools in different states, Alan is a student at Woodland and is 56…

A: a) Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: IQ scores are measured with a test designed so that the mean is 96 and the standard deviation is 18.…

A: The mean μ is 96  S.D  σ is 18

Q: Imagine that every elementary school in California is measured on several characteristics and then…

A: From the provided information, Mean (µ) and standard deviation (σ) of the school in Los Angeles…

Q: t is known that the average time required to complete a test exam is 80 minutes and the standard…

A: Given Information: Mean μ=80 min Standard deviation σ=10 min. To find how many minutes should the…

Q: . Average annual expense of a middle-income household living in Afghanistan is 360,000 Afghani with…

A: Given, Mean μ = 360000Standard deviation σ = 4000sample size n = 1500

Q: If the number of degrees of freedom for a chi-square distribution is 32, Determine the population…

A:

Q: Two friends, Karen and Jodi, work different shifts for the same ambulance service. They wonder if…

A:

Q: In a standardized exam the mean score is 400 with a standard deviation of 50. If a random sample of…

A: Given that  μ= 400 , σ= 50 , n = 25

Q: According to the U.S. Census, the average adult woman is the United States is 65 inches tall and the…

A: Given X is normal Distributed with mean µ = 65.0 and standard deviation σ = 3.0 Need to find Z score…