An article compared five different methods for teaching descriptive statistics. The five methods were traditional lecture and discussion, programmed textbook instruction, programmed text with lectures computer instruction, and computer instruction with lectures. 45 students were randomly assigned, 9 to each method. After completing the course, students took a 1-hour exam. We are interested in finding out if the average test scores are different for the different teaching methods. Test the claim using a 1% level of significance. a. What are the correct hypotheses

Q: Find the correlation coefficient for the data set below. xy 13 22 34 4 6 5 1 6 5 7 Answer: 7

A: Given data is x y 1 3 2 2 3 4 4 6 5 1 6 5 7 7

Q: Suppose that the height of Asian males aged 35-44 in the United States is normally distributed with…

A: Answer:- Given, The population is normally distributed with a standard deviation, σ = 3 .  And the…

Q: e average salary for American college graduates is $48,800. You suspect that the average is less for…

A: given data, claim:μ<48800n=50x¯=46328s=12770α=0.05 test statistics =?

Q: A die is rolled twice. What is the probability that a(n) 1 is rolled on the first roll and an even…

A: Probability is the ratio of favourable outcomes to the total possible outcomes. The probability…

Q: Suppose that there is a 15% chance that a randomly selected Stat 240 student wears glasses. Out of a…

A: It is given that the prob. that a selected stat 240 student wears glasses is 0.15. The sample size,…

Q: In the following exercises indicate whether the Central Limit Theorem applies so that the sample…

A: Sol:- According to the Central Limit Theorem, the sample proportions will follow a normal…

Q: It is not taking (0.1404, 0.3596) as the confidence interval

A: From the given table, the number of families with the first born child as female are shown below…

Q: You send a yardstick to a local laboratory for calibration, asking that the procedure be repeated…

A: Answer:- Given, The three data points are, 35.93 , 36.05 and 36.02 inches.  So, the average = [35.93…

Q: The U.S. Census Bureau announced that the mean sale price of new houses sold in 2011 was $267,900.…

A: Given that mean=μ=267900standard deviation =σ=90000

Q: Volunteering: The General Social Survey asked 1307 people whether they performed any volunteer work…

A: Sol:- (a) The point estimate for the population proportion of people who performed volunteer work in…

Q: FThe mean value of land and buildings per acre from a sample of farms is $1300, with a standard…

A: given data  population mean (μ) = $1300population sd (σ) = $200sample size (n) = 74

Q: The TUV company needs to form a committee of 9 people to solve a supply chain problem. If there are…

A: 20 qualified candidates select 9 people committee no. of different committees possible =?

Q: The graph of the discrete probability to the right represents the number of live births by a mother…

A: given datahere no. of live birtha and their probabilities are shown in the graph we have to find out…

Q: You want to estimate the mean number of friends for all Facebook users. How many users must be in…

A: Given data :  95% CI Standard deviation = 53 E = 7

Q: The graph of the discrete probability to the right represents the number of live births by a mother…

A:

Q: Please help with step 4 and step 6

A: Given information  Df=25, level of significance ɑ=0.05

Q: 6. Consider en experiment and two events A and B and their complements. The probability of the union…

A: Given that:   A Ac B   18 Bc 38   Union of A and B is, A∪B=34

Q: Andy is a restaurant owner. He believes 71% of his customers are satisfied with the food quality of…

A: The question is about sampling dist. of prop. Given : Popl. prop. of customers are satisfied with…

Q: QUESTION 2 Calculate the range of a dataset that has the following values: Lower Limit: 10 Upper…

A: Given that Lower limit=10 Upper limit=78

Q: It did not take the answer of (0.0214, 0.4786)

A: Given the data of the list of families with more than one child and the first child is female are…

Q: Ashley’s Internet service is terribly unreliable. In fact, on any given day, there is a 60% chance…

A: P(internet connection will lost at some point of day) = p = 0.60 P(not lost connection for  7 days…

Q: Considering the following statistical study: The Channel Tunnel, or Chunnel, is a 31.4-mile railroad…

A: Here we have taken the observations for pressure on 35 different sections of tunnel.

Q: The ages (in yours) and weights (in pounds) of all wide receivers for a football team are listed.…

A:

Q: Find the probability that if 10 different-sized washers are arranged in a row, they will be arranged…

A: 10 different-sized washers are arranged in a row P(they will be arranged in order of size) = ?…

Q: Milo works on an assembly line manufacturing widgets. Let X be the number of defective widgets that…

A: Given that the random variable X denotes the number of defective widgets produced by Milo in a given…

Q: What is a normal distribution in statistics, and how is it used in data analysis? How can you…

A: A normal distribution is a probability distribution that is symmetric around its mean and…

Q: 15. Entry to a certain University is determined by a national test. The scores on this test are…

A: Sol:- To determine if Tom will be admitted to the university, we need to calculate his percentile…

Q: Sloane has a bag of marbles with 3 blue marbles, 1 white marbles, and 1 red marbles. Find the…

A: Given,no.of blue marbles=3no.of white marbles=1no.of red marbles=1Total no.of marbles=5

Q: Find the following z values for the standard normal variable Z. (You may find it useful to reference…

A: The objective is to find the z-values for the standard normal variable Z.

Q: Read the following case and provide answers to all the questions. Individuals filing federal income…

A: Given The data is as follows: Population mean, μ=1056 Sample size, n=400 Sample mean, x¯=910…

Q: 15) Answer each question using the list below 3123, 1040, 1511, 2124, 1332, 2154, 5132, 6160 Mean =…

A: The question is about measures Given :   To find : 1 ) Mean 2 ) Median 3 ) Std. deviation 4 ) Range…

Q: 5 X; as in previous problem. Show that n Ε(Σ(Χ - μ;) Σ(Χ - μ;)) = Σκ IE i=1 where K; is the…

A: ANSWER: We start with the left side of the equation:   n E[Σ(Xi − µ) Σ(Xi − µ)ᵀ]   Expanding the…

Q: A Deputy Registrar (Human resources) at a certain University is concerned about employee absenteeism…

A: Given Information: Consider the given information:   Sample size Mean Standard deviation Low…

Q: An academic report shows that students scored better in the marketing module offered by the academy…

A:

Q: Determine the probability of 3 out of 5 people getting accepted into a graduate program, where the…

A: We have given information, Let X be the number of people getting accepted into a graduate program.…

Q: On a quiz with ten questions no part credit is given. Each student answered all ten questions. After…

A: X and Y are two random variable such that Z=X+Y Then the following properties hold true.…

Q: The table shows the magnitudes of the earthquakes that have occurred in the past 10 years. Use the…

A: histogram=option D

Q: 1. The two data sets represent random samples of weekly sales for two companies. Company A $2,500…

A: Given, the two data sets represent random samples of weekly sales for two companies.CompanyA ::…

Q: The mean number of words per minute (WPM) read by sixth graders is 81 with a standard deviation of…

A: Let X be the number of words per minute (WPM) read by sixth graders. With the usual notation, μ=81…

Q: For a particular Disney ride, the mean time to wait in line is 12 minutes. The distribution of the…

A: The question is about exponential distribution Given : Mean tile to wait in line ( λ ) = 12 min.…

Q: A 38 -year-old woman purchases a $200,000 term life insurance policy for an annual payment of…

A: The given probability that she will survive the year is 0.999052.

Q: In sports, we expect top athletes to get better over time. We expect future athletes to run faster,…

A: Sol:- a. For samples of 100 free throw shots in college basketball, the sample proportion of free…

Q: 7.4 IPHONE APPS The iPhone maker Apple announces that 25% of iPhone owners use a certain app. Let  �…

A: Sol:-

Q: Can you tell me what the explained variation percentage is?

A: The coefficient of determination is 0.8968.

Q: 1) You are reading the results of a recent research report that examined a community’s attitude…

A: Sol:- The question in the scenario meets the following measurement criteria: a) Strongly agree,…

Q: Thompson and Thompson is a steel bolts manufacturing company. Their current steel bolts have a mean…

A: Given that Mean=148, Variance=25, Sample size=50 Sample size is greater than 30, So the sampling…

Q: a. Does the scatter diagram slope up or down?? b. If you multiply all the values of y by -1, would…

A: Here we have given the correlation coefficient between x and y is 0.55 i.e. Corr(x,y) = 0.55 We have…

Q: Illustrate graphically and explain how each of the following factors would affect the demand or…

A: To illustrate how each factor affects the demand or supply for Nike factory workers, we can use a…

Q: In January 2013, a poll by ABC News indicated that Obama's popularity had reached a three-year high.…

A: We can use the given proportions to calculate the expected frequencies for each response by sex: For…

Q: (a) Perform a hypothesis test to assess whether there are significant differences in mean BMD for…

A: Given: ID Age fn1 fn2 fndiff fs1 fs2 fsdiff 1002501 27 0.73 0.68 0.05 0.99 1.04 -0.05 1015401…