Which technique for gathering data (observational study or experiment) do you think was used in the following studies? Explain your answer. (a) The U.S. Census Bureau tracks population age. In 1900, the percentage of the population that was 15 years old or younger was 44.4%. In 1930, the percentage was 30,8% in 1970, the percentage was 17 9 and in 2000, the percentage in the age group was down to 28.5% (The First Measured Century, T. Caplow, L. Hicks, B. J. Wattenberg)

Q: (a) Is a sample mean likely to be exactly equal to the population mean? Explain why or why not in…

A: Note: Hey there! Thank you for the question. As you have posted multiple questions, we have helped…

Q: Joseph is statistics instructor. He is interested in seeing if his fall class or spring class tends…

A: B. 0.0174

Q: The table to the right shows data found at a government census website, under a "Did All You Know"…

A: the correct answer would be:B. The information is distributed by an organization or individual.

Q: Suppose you know the population average wage in the manufacturing industry in the U.S. is $26.72 per…

A: It is given that the sample mean is 25.50, population standard deviation is 2.60, sample size is 40…

Q: I want to get you thinking further about the differences between samples and populations. Suppose…

A: Population: The population comprises all of the records along with quantifiable population…

Q: A math class got the following scores on a test. What percentage of students received a score of 85…

A: From table Cumulative frequency for score below or 85 is 9 Total students=14

Q: You want to study the things that affect depression.  You want to see if depression is changed by…

A: SOLUTION: Since we have to see if there is a relation between hours of therapy and depression we…

Q: Using the data in the following chart, answer the questions below:   A. Calculate by hand the…

A: Formula for z-score: z=score-meanstandard deviation   Person 4 plant A: Score:80…

Q: Below are the results of a cohort study. What is the attributable risk percent among the exposed…

A: The attributable risk percent among the exposed is given as: Risk percentage among exposed=Number of…

Q: Staying Single. From the U.S. Census Bureau document America’s Families and Living Arrangements and…

A: Hey there! Thank you for posting the question. Since your question has more than 3 parts, we are…

Q: affect depression.  You want to see if depression is changed by the number of hours of therapy that…

A: Solution The researcher wants to test if  there’s a relationship between hours in therapy and how…

Q: For the following questions, would you collect information using a sample or a population? Why?a.…

A: In statistics, a population refers to the entire group that you want to draw conclusions about while…

Q: What ACT score is above 99.749% of other ACT scores?

A: Let X be the ACT scores. Assuming that ACT scores are normally distributed with mean μ =20 and…

Q: If your grade for your AMDM class is computed the following way: Homework – 10% Quizzes – 10% Tests…

A:

Q: 1955, Life Magazine reported that a 25-year-old mother of three worked, on average, an 80 hour week.…

A: (d) State the hypotheses. That is, there is no evidence to conclude that the mean work week has…

Q: n the year 1990 25% of students at a particular university received some sort of scholarship. The…

A: Given Data: p^=12/25=0.48n=25   Null and Alternate hypothesis: H0: p=0.25 Ha: p≠0.25

Q: d. Three values of average age you would use for calculating the line of best fit would be 22, 34…

A: Regression analysis : Linear Regression analysis is used to measure the association or linear…

Q: Ho: p 0.5 O Họ: p - 0.5; Hạ:p 5 and ng > S. O The standard normal, since np 5 and ng > 5. What is…

A:

Q: You are conducting a study of students doing work-study jobs on your campus. Among the questions on…

A: As given here, question B is " How applicable is this work experience to your future employment…

Q: Given the following data, find the age that represents the 71st percentile. Ages of Presidents 56…

A: We have given the following data for ages of presidents: 564467476162664342465843595767

Q: The domestic airfare for business travel for the current year and the preVious year was reported. A…

A: t-test Statistic A t-test is an inferential statistic that is used and whether there's a significant…

Q: Determine whether the following observational studies are crosssectional, retrospective, or…

A: The observational studies are the one in which we only observe but not interfere or introduce…

Q: According to the Bureau of Labor Statistics, in 2018, 80.8% of families in the U.S. had at least one…

A: Statistic: If the value is a numerical measurement describing a characteristic of a sample then it…

Q: what range of raw scores makes up the middle 40%

A: The middle 40% means, the scores lie between 30th and 70th percentile. From stand normal, z-score…

Q: There is a relationship between the average age of mothers and the average number of cesarean…

A: Given that there is a relationship between the average age of mothers and the average number of…

Q: What is the mode for this data set

A: The data that has the highest frequency is called mode. In other words, it is the most frequent…

Q: For the following scenario, identify the population, sample, parameter, and statistic. Write “NONE”…

A: Given that Many Americans have never heard of the anime show Dr. Stone. You decide to survey 325…

Q: C2. GSS 2014 and GSS 2018 respondents were asked their opinion on whether homosexuals should have…

A: Given information: GSS 2014 and GSS 2018 respondents were asked their opinion on whether…

Q: The Bureau of Labor Statistics provides the annual average unemployment rate (civilian workforce 16…

A: It is a statistics problem