68% of data -95% of data- -99.7% of data- -3 -2 -1 1 2 3 What percent of the data is more than 2 standard deviations below the mean? -2 -1 0. 1. 2 3 Standard Deviation (s).

Q: n = 11 Ex=55 Ex²=2230 Give the value of the sample standard deviation.

A:

Q: 7, 12, 33, 33, 34, 37, 38, 40, 40, 41, 47, 51 2. The sample mean is about (а) 34.00 (b) 12.30 (c)…

A:

Q: When data is normally distributed the mean equals the median True False

A: Normal distribution

Q: Run an appropriate test to compare variance between x1 and x2. What is the name of the test you…

A:

Q: Find (a) the range and (b) the standard deviation of the set of data. 26, 32, 22, 24, 26, 31, 28 (a)…

A: 26,32,22,24,26,31,28 sample size(n)=7

Q: You invented an iPhone app. The mean time that users engage with this app is 8.2 minutes and the…

A: The mean is 8.2 minutes and the standard deviation is 1 minute.

Q: When data is normally distributed the mean equals the mode. True

A: Normal distribution

Q: A negative z-score indicates that the score or value is above the mean. True or False

A: Given: z-score

Q: The mean of the population is 50. The standard deviation is 10. (b) if a person's  percentile rank…

A:

Q: 3 A random sample of 1000 oranges showed that the mean amount of juice per orange was 8,4 fluid…

A:

Q: han women. She randomly selects 20 males and from the surgical floor of her hospital and records…

A: A nurse was interested in discovering whether men have variability in their systolic blood pressure…

Q: (c) Do the occupancy data for the 120 flights suggest that this scheduled flight is unprofitable?…

A: Given informaton:

Q: ACT Scores A survey of 1000 students nationwide showed a mean ACT score of 21.4. A survey of 500…

A: given data nationwidex¯1  = 21.4σ1 = 3n1 = 1000texasx¯2  = 21.3σ2 = 3n2 = 500α = 0.05claim : μ1 >…

Q: The coefficient of variation CV describes the standard deviation as a percent of the mean. Because…

A: Obtain the coefficient of variation for the variable Heights. The coefficient of variation for the…

Q: Suppose that the distance of fly balls hit to the outfield (in baseball) is normally distributed…

A: Let x¯ be the average distance of fly ball hit to the outfield. The 80th percentile of the…

Q: If you chose to compute a mean for a variable, which measure of variability would you most likely…

A:

Q: 10) The annual precipitation for one city is normally distributed with a mean of 27.5 inches and a…

A:

Q: A z-score tells us how many standard deviations a score is from the mean. What is another word for…

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

Q: A math teacher claims that she has developed a review course that increases the scores of students…

A:

Q: A positive z-score indicates that the score or value is below the mean. True or False

A: We want to tell you above statement is true or false

Q: Find the variance and standard deviation of the given set of data to the nearest tenth. {530, 150,…

A: As we know that varience is of set of data V(x)=1n∑i=1nxi-μ2  and standard deviation is SD=V(x)

Q: r-.393, n 48, p <.05, two-tails Interpret this finding in a short sentence as you would find it in a…

A: Given  r=0.393 n=48 p&lt;0.05 two tails

Q: 1. Find the Mean, Quartiles (Q1 & Q2), Decile (Ds), Percentile (P25), Variance and Standard…

A: The given data is 19, 12, 16, 0, 14, 9, 6, 1, 12, 13, 10, 19, 7, 5 and 8.

Q: (a) Is this an observational study or a designed experiment? Why? O A. This is an observational…

A: The researcher conducts a study to measure the walking speed of random travelers for departure and…

Q: Reponse time for seven emergency phone calls in a large metropolitan area were measured to the…

A:

Q: how do you find standard deviation? how many bars should you have for a standard deviation? do you…

A: Introduction:The standard deviation of a set of observations is the square root of the average of…

Q: each set of data, use the calculator to find the mean (xbar) and standard deviation (sx) 23, 14 ,65…

A:

Q: If a hypothesis is true and the difference between the control group and the experimental group is…

A: Based on the concept, If a hypothesis is true and the difference between the control group and the…

Q: What is the difference between a frequency distribution and a probability distribution?

A: A table displaying the frequency at which each value or range of values appears in a dataset is…

Q: Q4:- if you know that data ( 12, 10,12,10, 10,6) find the :- Mode, median, mean, variance and…

A:

Q: What does it mean when a score is in the tail of a distribution?

A: The distribution in statistics or probability is the shape in which the data behaves when plotted.…

Q: Marks obtained by students in a school examination follows a normal distribution. If 32% of the…

A:

Q: ill in blanks. When we are comparing our sample data to population data we…

A:

Q: nales took an average of four English courses with a standard deviation of 0.9. The females took an…

A:

Q: Scores of on a math test were normally distributed with a mean of 82 and a standard deviation of 6.…

A: The importance of standard normal curve lies in the fact that one has not to tabulate probability…

Q: Two samples are randomly selected from a population. One sample has n = 5 and the second has n = 30.…

A: In this case, there are two samples. One sample has size of n = 5 and another has size of n = 30.

Q: In a population distribution a score of x equals 28 corresponds to z equals -1.00 and a score of x -…

A: Given From the given information A score of X=28 Corresponds to z= -1 and a score of X=34…

Q: Q3/ The following data represent the lifetimes of light bulbs (in months), frequency distribution…

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