Suppose that in a large class at a major university, the instructor announces that the average grade on an exam is 72. Which is more likely to be closer to 72: i. The exam grade of a randomly selected student in the class? ii.The sample mean exam grade of a random sample of 40 students? Explain your reasoning.

Q: Q12. If 150 households were surveyed out of which 120 households have internet fiber cable, then…

A: Given Data: x=150-120=30 n=150

Q: of parents of children in high school felt it was a serious problem that high school students were…

A: Three conditions:1. Random: The sample is selected randomly, the first condition is satisfied.2.…

Q: You are the operations manager for an airline and you are considering a higher fare level for…

A:

Q: How large a sample should be surveyed to estimate the true proportion of college students who surf…

A:

Q: The symbol u, represents the mean of a sample of size n. True False

A:

Q: A biology professor claims that, on the average, 20% of her students get a grade of A, 30% get a B,…

A: The hypothesis is, Null hypothesis: H0:pA=0.20,pB=0.30,pC=0.25,pD=0.15,pF=0.10 Alternative…

Q: One sample has n = 6 and M = 10. A second sample has n = 4 scores with M = 15. If the two samples…

A: Combined mean = n1x1¯+n2x2¯n1+n2

Q: Twenty years ago, 53% of parents of children in high school felt it was a serious problem that high…

A:

Q: The symbol represents the mean of the sample. OTrue OFalse

A: Statement is :The symbol x¯ represents the mean of the sample.

Q: In sampling a large number of parts manufactured by a machine, the mean number of defective in a…

A: Givensample size(n)=20probability…

Q: Suppose you select a simple random sample of 75 Douglas College students, and you find that 8 are…

A: The point estimate of the population proportion is the sample proportion. Given that, 8 out of the…

Q: Previously, an organization reported that teenagers spend 8.5 hours per week, on average, on the…

A: To test whether a population mean is equal to the claimed value or not, a hypothesis test can be…

Q: The General Social Survey is an annual survey given to a random selection of about 1500 adults in…

A: The null and alternate hypothesis is a) The test statistics is The degrees of freedom is  The…

Q: .In sampling a large number of electronic chips manufactured by a machine, the mean number of…

A: First we have to find the probability of atleast 3

Q: A researcher wishes to estimate the number of households with two computers. How large a sample is…

A: Givenconfidence level = 90%Margin of error(E)=2%=0.02p^=0.45

Q: Did the samples shown most likely come from the same population, or two different populations? If…

A: Given :

Q: The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's…

A: Given, n=119, x=31, α=0.05 Then, p^=31119=0.260504

Q: Previously, an organization reported that teenagers spend 12.5 hours per week, on average, on the…

A: Note: " Since you have asked multiple sub-parts, we will solve the first three sub-parts for you. If…

Q: Based on a sample of 80 men, 35% owned cats Based on a sample of 40 women, 50% owned cats The test…

A:

Q: Twenty years ago, 46% of parents of children in high school felt it was a serious problem that high…

A:

Q: onsider a total of 1,000 people. If it was said that within 1 deviation (of the mean) of all people…

A: Given data, n=1000 it was said that within 1 deviation (of the mean) of all people like MATH 123

Q: In how many ways can a statistician select a sample of 15 people from a population of 90 people?

A: Given,A statistician select a sample of 15 people from a population of 90 people.

Q: A professor found out from a senior professor that engineering students in Harp University tend to…

A: Given information: μ=1.50x¯=1.35s=0.50n=9α=0.10

Q: Twenty years ago, 54% of parents of children in high school felt it was a serious problem that high…

A: From the provided information, Sample size (n) =750 and p0 = 0.54

Q: 2. A poll done by Kellogg Corporation asked a random sample of 500 high school students whether they…

A: Given that the sample size is 500 and the population proportion is 60%. a) The mean of the sampling…

Q: In a sample of size 20, the sample mean is 60. In this case, the sum of all observation in the…

A:

Q: For Americans using library services, the American Library Association claims that at most 70% of…

A: Here, One sample Z test is applicable. x = 85 , n = 100

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A: The value of p0 is 0.52 and the sample size n is 800.

Q: a national caterer determined that 37% of the people who sampled their food said that it was…

A: Given that,  n=144,p=0.37 Let p denote the sample proportion of people saying that the food is…

Q: Suppose that in a large class, the instructor announces that the average grade on an exam is 75.…

A: In a large class, the instructor announces that the average grade on an exam is 75. The two…

Q: A sample of n = 64 scores is selected from a population with µ = 80 and with σ = 24. On average, how…

A: Givenn=64μ=80σ=24

Q: Twenty years ago, 52% of parents of children in high school felt it was a serious problem that high…

A:

Q: 2. For Americans using library services, the American Library Association claims that at most 70% of…

A: Given: The random sample of patrons selected are n=100. The number of patrons who borrowed books are…

Q: Previously, an organization reported that teenagers spend 8.5 hours per week, on average, on the…

A: Given information: The data represents the number of hours per week teenagers spend on the phone.

Q: 8. Use the figure to the right, which shows the percentages of adults from several countries who…

A: Given Information: Country A: Sample size (n1) = 1003 Sample proportion (p^1) = 49% = 0.49 Country…

Q: In a recent survey, 80% of the community favored building a police substation in their neighborhood.…

A: From the provided information, 80% of the community favored building a police substation in their…

Q: A Verizon researcher compared the number of text messages sent by a sample of teenage boys to the…

A: a) In this case, the Verizon researcher compared the number of text messages sent by a sample of…

Q: The following are the scores of 10 students in a 50-item quiz.   42, 38, 33, 46, 42, 40, 38, 36,…

A: Given  Score of 10 students  Xi: 42, 38, 33, 46, 42, 40, 38, 36, 45,43 To find mean score of…

Q: NebNas manages the credit department for a grocery store chain in the province, and she would like…

A: From the given information, n=100x¯=101.5s=25.6μ=95 Given claim is the mean balance is different…

Q: rcher asked a random sample of students at the library on a Friday night, “How many hours a week do…

A: If the selected sample or data for analysis is selected in such a way that randomization is not…

Q: answer a A. the national percentage of automobile accident fatalities which are alcohol related is…

A:

Q: Previously, an organization reported that teenagers spend 12.5 hours per week, on average, on the…

A: t-test: If the given sample size is less than or equal to 30 then that is a small sample test.…

Q: 4. Suppose that only 10 students in Nabatieh campus had taken the midterm. Which of the following…

A: We know that, here  n= 10 (even) So median=(n/2 +(n/2+1)th term)/2 = (5th +6th term)/2

Q: A consumer group claims that the mean annual consumption of cheddar cheese by a person in the U.S.…

A: Claim: The claim is that the mean annual consumption of the cheddar cheese by a person in US is at…

Q: Please answer the following multiple choice question. View attached image to see the question

A: Identify the true of false for the given data. The correct option is identified below: From the…

Q: PracticE the legalization of marijuana. Among the Democratic voters surveyed, 158 of the 200 people…

A: 2 proportion z test is applicable

Q: Central Airlines claims that the median price of a round-trip ticket from Chicago, Illinois, to…

A: Given, This claim is being challenged by the Association of Travel Agents, who believe the median…

Q: Determine whether the statement describes a descriptive or inferential statistic. 59 % of all…

A: Explanation: It is given that 59% of all students at the local university eat out more than twice a…

Q: The symbol ¯xx¯ represents the mean of the sample. True False

A: The given statement is TRUE. Because, the symbol x-bar represents the mean of a sample.

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.