Which of the following is always true? A. standard deviation can be less than 0     B. coefficient of variation is an absolute dispersion     C. mean can be used for qualitative data D. standard deviation is always positive

Q: The variance of stock A is 0.0066 and the return is 0.115 ,  while B has the same return but 0.2 as…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: A variable x has a mean, µ, of 26 and a standard deviation, o, of 2. What is the standardized…

A: Given data, Mean = 26 Standard deviation = 2

Q: Suppose baby kittens' weights are normally distributed with a mean of 11.9 and a standard deviation…

A: a) Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: There are 24 employees in a particular division of a company. Their salaries have a mean of $70,000,…

A: To find: What is the value of the standard deviation after the change? Write your answer in units of…

Q: A sample has a mean M = 55. For the sample, the standard deviation is ? = 12 and the score…

A:

Q: An IQ score has a mean, u = 90, and standard deviation, o = 10. (5PTS EACH) 1. A genius is sometimes…

A: 5. Mean = 100, Stdev = 10 a. PX≥140 = PZ≥ 140-100 10 = P(Z≥ 4) = 0.000031

Q: could you answer 4,5&6 please

A: Standard normal distribution: The standard normal distribution is a special case of the normal…

Q: a sociologist studies two towns A and B. Town A has a mean income of x=70,000 with standard…

A:

Q: 37. Which of the following formulas is used to calculate the population standard deviation? A. o =…

A: Given that  We want to tell formula of population standard deviation  Note: According to bartleby…

Q: Find the standard deviation for the group of data items. Stems Leaves 8 1 58 2 58 The standard…

A: Given data : From the above stems and leaves data 8,15, 18, 25, 28 x¯ = ∑xin x¯ = 8+15+18+25+285 x¯…

Q: A variable x has a mean, p, of 30 and a standard deviation, o, of 5. What is the standardized…

A: From the given information,   Mean = 30 Standard deviation = 5   The objective is to find the…

Q: The value of F is based on the ratio of the standard deviations of the two independent samples that…

A: Here use F value formula for answer the question

Q: Three hundred college freshmen's grade point averages are seen to be nearly regularly distributed,…

A:

Q: On an Engineer Licensure Exam with a population mean of 83 and standard deviation of 8. Jenny scores…

A:

Q: A population of scores has µ=250, In this population, a score of X=300 corresponds to Z=+2.50. What…

A:

Q: Which of the following is true for normal distributions? Around 30% of the scores will be located…

A:

Q: Suppose IQ scores in your community are normally distributed with a mean of 102 and a standard…

A: From the provided information, Mean (µ) = 102 Standard deviation (σ) = 11 a) The Z score is 2.52.…

Q: On a test the mean score is 25 and the standard deviation is 2.3.  Which score could be expected to…

A: Mean =25 s = 2.3 z-critical value at alpha 0.05 is 1.65

Q: standar For Jesse 13. a. Find the mean and standard deviation of a normal distribut of marks in an…

A: Note: we are using standard normal distribution table.

Q: A population has a mean of 75 and a standard deviation of 15. You randomly sample nine people from…

A:

Q: 3) Which of the following is a biased estimator? 3) A) variance B) standard deviation C) mean D)…

A: which of the following is biased estimator

Q: Which of the following statements are true? i. It is okay to use the median to estimate the mean…

A: From the given data ,only the " THIRD " statement is true. i.e..; [ POINT ESTIMATES BASED ON A…

Q: Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample…

A: The standard error of the mean is,

Q: Which of the following statements is incorrect? The median is the most appropriate measure of…

A: Measure of central tendency measures the central or average value of a dataset. Measured of…

Q: Which of the following statements must be true? (A) The medians of the two data sets must be equal.…

A: We know that, mean, median, mode, range and standard deviation of any data set can be less, equal,…

Q: Which of the following would not be a mistake? a) You notice that entry-level employees in industry…

A: Given four scenarios.

Q: Suppose that, for a certain exam, a teacher grades on a curve.   It is known that the mean is 65…

A: According to Empirical rule, middle 68.2% of students receive C. Nreceive C=0.682×25…

Q: A set of sociology exam scores are reported as X values and z-scores. On this exam a score of X = 75…

A: Given information: The X values with their corresponding z-score is summarized in the following…

Q: a normal population has a mean of 28 and a standard deviation of 5. what proportion of the…

A: It is given that mean and standard deviation are 28 and 5, respectively.

Q: (a) How many students should receive a C?  student(s) (b) How many students should receive an A?…

A: Solution:

Q: The scores on an economics examination are normally distributed with a mean of 75 and a standard…

A:

Q: A real estate agent claims that mean household incomes in Fairfax and Arlington are equal. Draw 32…

A: Given Claim : The mean household income in Fairfax and Arlington are equal Claim can be either in Ho…

Q: Suppose the average income of students is $100 per day, with a standard deviation of $10. Now, a…

A: We want to find value for the question

Q: The residents of two towns both have a mean income of $30,000. Town a has a standard deviation of…

A: Given, μA=30000μB=30000σA=2600σB=25000

Q: 1. In a population of high school students' algebra scores, the mean is 64 and the standard…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: need help with 14& 15 pls

A: Hey, since there are multiple questions posted, we will answer first question. If you want any…

Q: 4. Which of the following statements about measures of variability must always be true if the…

A: Options c and d are correct.

Q: which has the smallest standard deviation? 1) 2) 2) 4) 5) They are all equal it can't be determined

A: Standard deviation is a measure of spread. A little variation or measure of spread indicates a…

Q: Which of the following statements about the relationship between the population standard deviation…

A: If the sample size becomes larger, then the standard error decreases since with greater sample…

Q: Which of the following is true? - Lower standard deviation means scores are less varied. - The…

A: Standard deviation is a measure of how spread the data values are.

Q: Using the Appendix Table A-1 in Statistical Psychology:  The mean for quiz#1 was 1.14, the standard…

A: Given : The mean for quiz#1 was 1.14, the standard deviation was .30. Define random variable X…

Q: The Truly Amazing Dudes are a group of comic acrobats. The weights (in pounds) of the ten acrobats…

A: The data shows the weight of the ten acrobats.

Q: Which of the following stocks is riskier if you are considering investing in X or Y only? Stock…

A: Given Stock standard deviation coefficient of variation X 40% 2 Y 40% 4 We know that,…

Q: Suppose a population has a mean weight of 180 pounds and a standard deviation of 25 pounds. A sample…

A: Given,mean(μ)=180standard deviation(σ)=25sample size (n)=100

Q: Which of the following is True about the Z-score of an observation? A. The Z-score of an observation…

A:

Q: Which of the following statements about the relationship between the population standard deviation…

A: From the formula, we can see that the standard error (S.E.) is inversely proportional to the sample…

Q: Which of the following statements is correct about the standard error of the mean ( s/√n )? A. The…

A: Standard error of mean is given by the formula as follows: SE=σn Therefore, larger the sample size,…

Q: Summary statistics for the number of campsites at public parks in a large western state are as…

A: Inter Quartile Range: It is a measure of statistical dispersion. It is also called as mid-spread. It…

Q: Choose the letter of the correct answer. 1. Which of the following is always true? A. standard…

A: The standard deviation is a measure of the overall variation in a data set.

Q: By studying the standard deviation fomula, given below, explain why the standard deviation of a set…

A: Option (C) The values of x-x is always greater than  or equal to 0. This is the correct answer…