2 Which of the following situation uses descriptive statistics? * The average age of students in statistics class is 17 years. From the past figures, MITIS population will reach 2000 in the year 2025. There is a relationship between smoking cigarettes and getting emphysema After tossing a coin and getting a head, it will be tail on the next toss.

Q: The mean of a population is 40 and its standard deviation is 3. What are the values ​​of the mean…

A: Given that  Mean=E(X)=40 Standard deviation=Std(X)=3 Variance=Var(X)=32=9

Q: The systollc blood pressure (BP) of adults In the USA Is nearly normally distributed with a mean of…

A: Given Data Population Mean,μ = 121.0 Population Standard Deviation,σ = 15.0

Q: A student calculates the value of r as +0.72 for a question comprising 5 pairs of observations and…

A:

Q: A population with a mean of µ = 15 has 40 scores. What is X?

A:

Q: 1. How much of the data lies between one standard deviation from the mean, two standard deviations…

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Q: 2. Suppose we have a data set of the number of traffic violations per day in NYC that was entered…

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Q: Professor Tom knows that the mean score on the midterm exam from all the years he has been teaching…

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

Q: The XYZ company wants to see if interview scores predict job performance scores. So it goes back…

A: The claim is to check whether there is a relationship between employee interview scores and employee…

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: Suppose you have a data set of size 26, with mean 50 and standard deviation 8. If you subtract 8…

A: Size of the data set is 26, with mean 50 and standard deviation 8. A value of 8 is subtracted from…

Q: On average, Americans have lived in 2 places by the time they are 18 years old. Is this average less…

A: Sample size is greater than 30 and the population standard deviation is known. It is appropriate to…

Q: imagine you’re hired by a beef company called “American Beef Makers” as a Data Analyst and you’re…

A: Please note that as per our guidelines if multiple sub-parts are there in a question we can answer…

Q: Example 1: Recent research suggests that a pregnancy within less than two years of a live birth…

A: Given: Sample size n = 15 Significance level α = 0.10 Formula Used: Test-statistic t = d-μdsdn…

Q: The mean and standard deviation of quiz scores of a group of students are 28 and 4.1 respectively.…

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Q: he first sheet of the spreadsheet linked above contains the scores of 50 students on 4 different…

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Q: The mean math achievement for the older students is 50.95. The mean math achievment for the younger…

A: Introduction - Means - Means (average ) are used to measure across a diverse group of samples ,…

Q: 1. The mean score and the standard deviation in the Statistics test are respectively equal to 80…

A: For Statistics test: Mean(μ) = 80 Standard deviation(σ) = 2.5 For Mathematics test: Mean(μ) = 70…

Q: The average student studies eight hours for a statistics exam and receives a grade of 84. In a…

A: Given that, Claim: Test the hypothesis that the studying twelve hours statistically significantly…

Q: Suppose you are the personnel manager for a company, and you suspect a difference in the mean length…

A: Answer:-

Q: In Professor Krugman’s economics course, the correlation between the students’ total scores prior to…

A: a)   The equation of the line is y=143.2608+1.344x and it is obtained below:   From the given…

Q: A researcher wants to determine whether having a healthy exercise regimen increases the happiness of…

A: GIVEN,  SUBJECT BEFORE EXERCISE 1 WEEK 1 MONTH P TOTAL A 0 0 6 6 B 1 3 5 9 C 0 1 5 6 D 4…

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A: Given data: The number of observations in the first group and its mean is: n1=10μ1=16 The number of…

Q: Suppose that Harry and Ron take an exam for which the mean score is 60 and the score of standard…

A: Given information- Population Mean µ = 60 Standard deviation (σ) = 10 Harry's score = 80

Q: 6. The below data are a sample of cholesterol levels taken from 24 hospital employees who were on a…

A: For the data, draw an histogram for differences data in excel with number of bins=5 as The histogram…

Q: 3. The effectiveness of Prilosec for treating heartburn is tested by measuring gastric acid…

A: Here given test the effectiveness of prilosec for treating heartburn is tested  For this test…

Q: Suppose that Max is a climate change scientist and butterfly enthusiast. In Max's locale, the mean…

A: The distribution is normal and the population standard deviation is unknown so the t distribution…

Q: A sample of  n= 5  scores has a mean of 12 . If one new score with a value of  x=18 is added to the…

A: Given information- Sample size, n = 5 Sample mean = 12 Since we know that-

Q: State the mad scientist’s null and alternative hypotheses   2 Find the critical r 3 Compute the…

A: 1 State the mad scientist’s null and alternative hypotheses 2 Find the critical r

Q: Yoonie is a personnel manager in a large corporation. Each month she must review the employees in…

A: From the given information, mean is 4 hours and standard deviation is 1.2 hours.

Q: The researcher believes that happy workers are more productive workers. So he administers a job…

A: It is given that the researcher believes that happy workers are more productive workers.

Q: A researcher has participants expacting to receive either painful or mild electrical shocks during a…

A: In survival analysis studies both parametric and non-parametric statistics are used. For example, in…

Q: 1. The mean score and the standard deviation in the Statistics test are respectively equal to 80 and…

A: Given that  Mean score in Statistics test =80 and  Standard deviation =2.5 In Mathematics  Mean…

Q: Professor Nord stated that the mean score on the final exam from all the years he has been teaching…

A: From the provided information, Professor Nord stated that the mean score on the final exam from all…

Q: An Economics instructor assigns a class to investigate factors associated with the gross domestic…

A: The correlation coefficient r should be between -1 to 1.  So the given statement is wrong.  Option…

Q: Jim has been stopped for speeding three times in the last year, but each time was given a warning…

A: given : solution:   The regulation of averages is the concept that some thing is positive to show up…

Q: She scored 5 points above the mean on both exams. From this information, what can you conclude about…

A: Given that  Last week Jenni had exams in Spanish and in Cognition.  She scored 5 points above the…

Q: A group of 20 students obtained a mean score of 70 on an examination. The second group of 30…

A: From the question, the required information is given below:

Q: Suppose Professor Alpha and Professor Omega each teach Introductory Biology. You need to decide…

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Q: The first four deviations from the mean in a sample of n = 5 reaction times were .3, .9, 1.0, and…

A: It is given that, n=5 and  First four deviations from the mean for reaction time is 0.3,0.9,1.0,1.3…

Q: 11. Ed had a mark of 75 out of 80 on a test, which had a mean mark of 60 and a standard deviat Sam…

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Q: Professor Nord stated that the mean score on the final exam from all the years he has been teaching…

A: The mean score on the final exam from all the years he has been teaching is a 79%  His class’s mean…

Q: 2) Researchers are interested in whether there is any relationship between a person's IQ (x-…

A: A) Given data is appropriate for paired t-test because it is a small sample test. The most…

Q: 9. It is assumed that achievement test scores should be correlated with student's classroom…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: There are two samples with means 15 and 18. Both of those samples consist of 24 observations. Sample…

A: Denote μ1, μ2 are the population means for 1st and 2nd populations, respectively.

Q: faculty cars have ages with a mean of 6 years and evel to test the claim that student cars are older…

A: Let X1 be the student car's age. x¯1: Sample means of student cars age= 7.2 s1 : Sample standard…

Q: In Professor Krugman’s economics course, the correlation between the students’ total scores prior to…

A: Solution: Given information: let x =  The Pre‑exam totals for all students in the course. y = The…

Q: . NCAE shows that the average score of the students is 80 and sd is 15.  What is

A: From the given information, μ=80σ=15

Q: One year, the SAT verbal test had scores with a mean of 500 and a standard deviation of 100. SAT…

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Q: The wrong alternative. One of your friends is testing the effect of drinking coffee on the duration…

A: