(a) Find the standard deviation of the combined data (b) Which of the two distributions is more variable ?

Q: Express the k th percentile, Pk , of a normally distributed variable in terms of its mean, μ, and…

A: The kth percentile represents the area of k to the left of z. Here, the kth percentile is calculated…

Q: the variance and standard deviation are based on the________________?

A: Variance, standard deviation and mean deviation:Variance is the average of squared difference of…

Q: A medical researcher is studying the relationship between pica and iron deficiency. She measures the…

A: Given Information: Mean μ=13.2 Standard deviation σ=1.2

Q: For normally distributed variables, approximately what percentage of values fall within two standard…

A: Given a normally distributed variable X. Let us assume its mean is µ and standard deviation…

Q: What is the standard deviation of y?

A:

Q: A score that is 12 points below the mean corresponds to a z-score of z =-1.50. What is the standard…

A:

Q: Calculate variançe and standard deviation from the given data,

A:

Q: At a local high school, GPA's are normally distributed with a mean of 2.9 and standard deviation of…

A: Given problem Given that   At a local high school, GPA's are normally distributed with a mean of…

Q: If there is a small amount of variation, then the standard deviation is what

A: Standard deviation: It is defined as the positive square root of the variance. It fulfils requisites…

Q: Show that the standard deviation of z-scores equals 1

A: z score is given by, z score = x-μσ Where, x: Raw score μ: Population mean. σ: Population standard…

Q: If the variance of a distribution is 16, the standard deviation is?

A: Solution: From the given information, the variance of a distribution is 16.

Q: Why roles are reserved for the variance and particularly for its square root, the standard…

A: Variance and standard deviation: Variance measures absolute variability in a data set, calculated…

Q: The random variable X represents the average number of texts a teenager sends, where the…

A: Given, μ = 450σ = 150To find,P (X > 700) = ?

Q: Express the quartiles, Q1, Q2, and Q3, of a normally distributed variable in terms of its mean, μ,…

A:

Q: The standard deviation of the certain distribution is 9, what is its variance?

A: Hello! As you have posted 2 different questions, we are answering the first question. In case you…

Q: Can you find the mean and the standard deviation with this data?

A: Given: Data on Index finger length for female. Step-by-step procedure to obtain the mean and the…

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: When you use the two-standard-deviations F-test, what assumption must be met by the variable under…

A:

Q: In which distribution shape does the Standard Deviation Rule apply?

A:

Q: What is another name for the standard deviation of the variable x? What is the reason for that name?

A:

Q: Is it possible to obtain a negative value for the variance or standard deviation?

A: The variance and the standard deviation, which is the square root of the variance are the most…

Q: the average final examination scores produced by the two methods are different if the population…

A: Let sample 1 for method A and sample 2 for method B. Given: n1=40, n2=36x1¯=78, x2¯=74σ1=5, σ2=5

Q: A score that is 6 points below the mean corresponds to a z-score of z = -2.00. What is the…

A: Given: z-score = -2.00 Formula: Where,

Q: Adult Golden Retrievers have a mean weight of 64 pounds with a standard deviation of 8 pounds. If…

A: In this scenario, it is known that the  mean weight is 64 pounds with a corresponding standard…

Q: The number of cartoons watched by Mrs. Kelly's first grade class on Saturday morning is shown below.…

A: 0 0.15 0 0 0 1 0.20 0.2 1 0.2 2 0.30 0.6 4 1.2 3 0.10 0.3 9 0.9 4 0.20 0.8 16 3.2 5 0.05…

Q: A previous study claims that the average time a teenager spends browsing his social media accounts…

A: Sample size(n)=100 Population mean(μ)=6 Sample mean(x)=5.5 Standard deviation(σ)=0.5

Q: A score that is 9 points above the mean corresponds to a z-score of z = 1.50. What is the population…

A:

Q: A store sells meat in smallmedium and large size packages. The small packages have a mean weight of…

A: Here given that, Mean, mu= 1 And standard deviation, sigma= 0.1 Z score is given by, Z score=…

Q: The test scores for a very large statistics class have a bell-shaped distribution with a mean of 72…

A: We have given that  X~N(mu, sigma^2) mu = 72  Z-score =(x-mu )/sigma

Q: Hello, how do you calculate this? Thank You!

A: Compute the 90% confidence interval for the population mean.Since the sample size is small and the…

Q: A teacher finds that the test scores of a group of 40 students have a mean of 72 and standard…

A: (a) A teacher finds that the test scores of a group of 40 students have a mean of 72 and standard…

Q: A store sells meat in small, medium and large size packages . The small packages have a mean weight…

A: Given that small packages have a mean weight of 1 pound and a standard deviation of 0.1 pound. i.e.…

Q: A score that is 20 points above the mean corresponds to a z-score of z – 1.25. What is the standard…

A: Given: z= 1.20 20 points above the mean. that is

Q: The value of the standard deviation will always exceed that of the variance. TRUE OR FALSE

A:

Q: How I can calculate the standard deviations of each of the two differentassets?

A: Standard deviation is the positive square root of the mean of the squares of the deviations of the…

Q: Find the mean and standard deviation of the waiting time for counter A and B.

A: The values for counter A are- 18, 21, 22, 23, 23, 24, 24, 25, 25, 25, 26, 30, 32, 34, 50 The values…

Q: Can you find the mean and the standard deviation?

A: To find the mean and standard deviation of the given data: Mean is the sum of observations divided…

Q: The standard deviation of a normal random variable X is $50 . Given that P(X ≤ $40) = .25, what is…

A: Given data,σ=50x=40P(X ≤ $40) = .25μ=?

Q: The variance of a sample of 100 observations 81. the standard deviation of the sample equals?

A:

Q: What conclusion can you make base on the standard deviation?

A: Answer:

Q: What happens to the standard deviation if the differences between the mean and data values are…

A: The standard deviation, which is described through a mathematical quantity to measure the amount of…

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

A:

Q: When the correlation between x and y is –1.0, what will the standard deviation of errors be? Why is…

A: * ANSWER :-  Based on the above information the answer is  as follows

Q: In a sample distribution, a score of x = 21 corresponds to z = -1.00 and a score of x = 12…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ  are the mean…

Q: The margin of error is larger if the standard deviation of the population increases (assume all else…

A: Given that, Standard deviation of the population increases.

Q: A certain data set has a variance of 9.  Find the standard deviation of the data set.

A: Given :-   Variance (S2) =9   we have to find standard devistion.

Q: The variance in a data set is 427. Find the standard deviation. Round to two decimals.

A: The random variable is X. It is given that the variance is 427. We have to find the standard…

Q: Given that the mean and standard deviation are $24 and $3. Calculate the variance.

A: