Consider the following exam scores of all students in a class. 39, 15, 27, 21, 33, 24, 18, 36, 42, 30 (a) Obtain Variance and Standard deviation of exam scores. (b) Draw a box-and-whisker plot of exam scores and comment on your plot. (c) Find an interval so that exam scores will fall within two standard deviations of the mean. Using an appropriate rule, mention the percentage of scores that this interval contains.

Q: Read the following information carefully and answer the corresponding questions. A study of the…

A: State the hypotheses.

Q: The following dot plots represent data that has the same sample size and the same mean. However,…

A: The more the dots are scattered, larger is the standard deviation

Q: sets represented by the following histograms has the largest standard deviation?A data set lists the…

A: Given: Minimum = 3 Median = 15 Q3 = 16 IQR = 4 Maximum = 19

Q: What percent of data points fall in the range of z=-1.5 and z=1.5 standard deviations of the mean

A: From the provided information, The range is between z = -1.5 to z = 1.5

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Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A: Solution: Let X be the length of pregnancies in a small rural village From the given information, X…

Q: Q3. Consider the following exam scores of all students in a class. 39, 15, 27, 21, 33, 24, 18, 36,…

A: Given data :  39,15,27,21,33,24,18,36,42,30

Q: From the following data relating to the daily wages of 15 workers in a factory. Wage in RO 14, 16,…

A: Mean = (summation Xi)/n Here n= 15 Mean= (14+16+16+14+22+13+15+24+12+23+14+20+17+21+22)/15 = 17.53

Q: A sample of the number of sick days used by employees at a clinic is as indicated: 0,    0,    1,…

A: Given data 0,0,1,1,2,4

Q: A normally distributed set of data has been generated where 50% of the data lies below 97 and 70%…

A:

Q: Suppose two sections of the same class take the same exam and produce the results shown in the…

A: The relative frequency distribution of section 1 scores and section 2 scores, are given.

Q: Here is a data set. 0,1,1,2,3,5,8,13 Use the table method and find the standard deviation.

A: Given numbers 0,1,1,2,3,5,8,13

Q: the ____ is based on only two scores in a distribution. -deviations  -variance -range -standard…

A: We know that, Deviations refers to the distance between the observations from their corresponding…

Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: Given sample size n1=15, sample mean x̄1=31500, s1=sample standard deviations=7900  sample size…

Q: Which of the following would indicate that a dataset is not bell-shaped? A. The mean is much…

A:

Q: Which of the following is least affected if an extreme high outlier is added to your data?…

A:

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: We have given that  Sample sizes n1= 40 , n2= 35  Sample means xbar1= 3.2 , xbar2=1.9  Standard…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A: Determine the range that would be expect to obtain the middle 98% of most pregnancies.   The range…

Q: What is the sum of the deviation scores for the data in the frequency distribution table below?

A: Sum of deviation  of scores from mean is always zero.

Q: If a set of grades for a class has a large range and a small standard deviation, what can you say…

A: It is given that a set of grades for a class has large range and a small standard deviation.

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 267 days…

A:

Q: The following are the weight (kg) of 20 senior high school students: 1. What is the mean, variance,…

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

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: From the provided information,

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: The sample standard deviations are s1=2 and s2=1.5.

Q: A recent study in the restaurant business determined that the mean tips for male waiters per hour of…

A:

Q: Read the following information carefully and answer the corresponding questions. A study of the…

A: To test:H0:μ=1.4H1:μ≠1.4 Since, population standard deviation is not known, use t-test to check the…

Q: Suppose the scores of students on a Statistics course are Normally distributed with a mean of 440…

A:

Q: The college physical education department offered an advanced first aid course last semester. The…

A: Given Information: The scores on the comprehensive final exam were normally distributed, and the  z…

Q: A science teacher claims that the mean scores on a science assessment test for fourth grade boys and…

A: From the given information, σ1=σ2M1=138, s1=39,n1=53M2=138,s2=30,,n2=75  α = 0.05 Thus,  Null and…

Q: The weights for players in the National Football League (NFL) have a right skewed distributed with a…

A: Solution: Given information Mean =μ= 245 poundsStandard deviations= σ=20 Pounds The distribution is…

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: Central limit theorem states that as the sample size become large(>30), the distribution of…

Q: The distribution of the number of hours people spend at work per day is unimodal and symmetric with…

A: Solution-: Given: μ=8hours,σ=0.7hours We find, (a) If Saba’s z-score for his work hours was −1.3 ,…

Q: The lengths of pregnancies in a small rural village are normally distributed with a mean of 263 days…

A: The mean is 263 and the standard deviation is 14 days.

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: It is given that For baseball players, mean1 = 3.2 and SD1 = 2 For football players , mean2 = 1.9…

Q: calculate the range and interquartile range. Then compute the SS, variance, and standard deviation.…

A: Given data: Scores of sample size n = 4 are: 1, 3, 7, 9 (in ascending order) The range of the data…

Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: Let Population 1 be the salaries for people with doctoral degrees and Population 2 be the salaries…

Q: For her test grades, Gena has a mean = 65 and standard deviation = 25. Patti has a mean = 65 and…

A: Gena has a mean = 65 and standard deviation = 25. Patti has a mean = 65 and standard deviation = 5…

Q: A demographics researcher claims that the mean household income in a recent year is the same in Ada…

A: Given: α = 0.10 n1 = 18 X1 = 58300 s1 = 9000 n2 = 20 X2 = 56600 s2 = 15600 Formula Used: t-test…

Q: What measures of center and spread should be used when comparing the distributions of movie runtimes…

A: what measures of center and spread should be used when comparing the distributions of movie runtimes…

Q: Which of the following data would be most appropriate to report standard deviation ? scores of an…

A: Standard deviation- Standard deviation is a measure of dispersion. It is a quantity that expresses…

Q: A science teacher claims that the mean scores on a science assessment test for fourth grade boys and…

A:

Q: The salaries of professional baseball players are heavily skewed right witha mean of $3.2 million…

A: According to central limit theorem, for large sample (>30) or if the population follows normal…

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A: The variance of grading procedure for Professor 1 is σ12 and the variance of grading procedure for…

Q: 3. Below are dotplots for three small datasets: A, B, and C. Without performing any calculations,…

A: Introduction: The dotplots of three datasets are given.

Q: Is it worth pursuing a doctoral degree in education if you already have an undergraduate degree? One…

A: Population 1 : The salaries for people with doctoral degrees. Consider , population mean : μ1 Sample…

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: According to the central limit theorem, when a sample of size n is drawn from any population with μ…

Q: The salaries of professional baseball players are heavily skewed right with a mean of $3.2 million…

A: