When we make a set of measurements, the width or standard deviation of the sampled parent distribution generally reflects the accuracy of our measurement methods. True or False

Q: As the sample size             , the standard deviation of ?¯x¯             . increases; decreases…

A: The formula for sample standard deviation can be written as:

Q: At a computer manufacturing company, the actual size of computer chips is normally distributed with…

A:

Q: If the variance of the recorded weights of nine basketball players is 2.36, what is the value of the…

A:

Q: What distribution is used in this chapter to make inferences for one population standard deviation?

A:

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: Under what conditions can the mean of the sample be treated as a value that is from a population…

A: From the above data  under what conditions can the mean of the sample be treated as a value that is…

Q: If the mean is zero and the standard deviation is one in a normal distribution, what type of normal…

A: We know that if the normal distribution has 2 parameters as mean, μ and standard deviation, σ, where…

Q: Describe carefully how mean deviation, standard deviation and quartile deviation of any given…

A: Mean deviation : Mean Deviation is the mean of all absolute deviations of a set of data. Standard…

Q: When you have a skewed distribution, it is better to use-- than -- interquartile range;range…

A:

Q: What is the mean of the distribution? What is the standard deviation of the distribution?

A: Given Mean1=30 Mean2=27 n1=41 n2=57

Q: The mean of a population (μ) is 120 and the standard deviation is 20.  What is the mean of the…

A: From the provided information, Mean (µ) = 120 Standard deviation (σ) = 20

Q: If the number of degrees of freedom for a chi-square distribution is 21, what is the population mean…

A: Given: Degree of freedom = 21

Q: Assuming that the heights of college women are normally distributed with mean 62 inches and standard…

A:

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: The standard deviation may not be greater than the mean. O True O False

A: False: standard deviations may be greater than mean  example: random variable x follow standard…

Q: If a distribution is normal with μ = 10 and σ = 5, what is the z score of 20?

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: What is the standard deviation of the data?

A: We want to calculate standard deviation

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

A:

Q: The mean and standard deviation of a population are 200 and 20, respectively. Suppose samples of…

A: Given : μ = 200 , σ= 20 and n= 36

Q: A normal distribution has a mean of 62 and a standard deviation of 12. What is the median?

A:

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: Do the "Height in Inches" data set adhere to the empirical rule? Would you conclude that| the…

A: (b). Check whether the data of “Height in Inches” follows approximately normal distribution: The…

Q: Approximately what percentage of normally distributed data will fall within 2 standard deviations…

A: Based on the Concept of Empirical Rule: About 68% of the area under the curve falls within 1…

Q: The standard deviation of a sampling distribution is smaller than the standard deviation of the…

A: The comparison of sd of sample to the sd of the population is as follows:

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: If a distribution is normal with μ = 60 and σ = 15, what is the z score of 40?

A:

Q: The sample standard deviation for the cost is $

A: The sample standard deviation for the frequency distribution is, s=1n-1∑ifixi-x2 The sums are,…

Q: If the standard deviation, o is known the 2-distribution values may not be used to determine…

A:

Q: If you have a population standard deviation of 10 and a sample size of 4, what is your standard…

A: Given,population standard deviation(σ)=10sample size(n)=4

Q: As the size of a sample increases, the standard deviation of the distribution of sample means…

A: Here  Standard deviation of sample mean = σn

Q: If the number of degrees of freedom for a chi-square distribution is 28, what is the population mean…

A: It is known that for chi-square distribution: μχ2=degree of freedom   So,μχ2=28

Q: The students of a large university in Luzon were studied regarding their hours of sleep at night.…

A: Given Information :  The students of a large university in Luzon were studied regarding their hours…

Q: If the mode of a normal distribution is 100 with variance equals 4, then the mean equals

A: Note: Normal distribution is symmetrical distribution. Hence, the mean, median and mode are all…

Q: A normal distribution has a mean of 61 and a standard deviation of 15. What is the median?

A: Given, A normal distribution has mean of 61 and standard deviation of 15. Properties of normal…

Q: When a distribution is bell-shaped, approximately what percentage of data values fall within 1…

A: We know that, the empirical rule which is also known as 68-95-99.7 rule.  The Empirical Rule finds…

Q: The sum of deviation scores in any distribution (population or sample) is always equal to 0.…

A: Let us take an example.   Let X be random variable    we know that Meanx¯=∑xn Therefore, ∑x=nx¯

Q: What us the variance of a distribution having a standard deviation of 5.26?

A: Given, standard deviation=5.26 find variance=?

Q: If the Standard Error SE( y ) is 1.299 and if the sample standard deviation is 4.87, what is the…

A: It is given that S.E(mean) = 1.299 Sample SD s = 4.87

Q: the standard deviation for the sample distribution of mean is called?

A: Given: To find = the standard deviation for the sample distribution of mean is called ?

Q: The scores of 800 students in a 100-item exam resemble a normal distribution with a mean of 78 and a…

A: Let X be the random variable from Normal distribution with mean (µ) = 78, standard deviation (σ) = 8…

Q: The error in the “best estimate” of the mean of a parent distribution is determined by the errors in…

A: The error in the “best estimate” of the mean of a parent distribution is determined by the errors in…

Q: As reported in Runner's World magazine, the times of the finishers in the New York City 10- km run…

A: Percentile : Percentile is the number such that certain percentage of the fall below that values.…

Q: The standard deviation of the distribution of sample means would be equal to:

A: The standard deviation of the distribution of sample means would be equal to ?

Q: A distribution is known to be bell-shaped, with a mean of 82 and a standard deviation of 6. What…

A: Obtain the Z-score for the random variable X equals 76. The Z-score for the random variable X equals…

Q: The mean, median, and mode of a normal distribution are (Choose one) each other. standardized by…

A: For Normal distribution, mean, median and mode are coincide.

Q: Explain term refers to the standard deviation of the sampling distribution?

A:

Q: In a normal distribution with a mean of 72 and a standard deviation of 12, what percentage of…

A:

Q: Based on the relationship between the mean, standard deviation, and minimum time, is it reasonable…

A: HERE WE CAN USE THAT minimum value is approx 3 times standard deviation away from mean.

Q: If a sample size is 100 and the population standard deviation is 30 then the standard deviation of…

A: Given: Sample size (n) = 100 population standard deviation =30