A data set has a mean of 40 and standard deviation of 8. -2 standard deviation = -1 standard deviation +1 standard deviation = +2 standard deviation =

Q: The gestation period for human births can be taken as normally distributed with a mean of 256 days…

A:

Q: A researcher studying stress is interested in the blood pressure measurements of chief executive…

A: 1) The researcher is testing whether mean is different from 136. Hence, the null hypothesis and…

Q: College students average 7.8 hours of sleep per night with a standard deviation of 40 minutes. If…

A:

Q: What percentage of the data will fall between 1 standard deviation below the mean and 2 standard…

A: P(-1<z<2)=?

Q: there are 300,000 people review  for the movie  pupulation mean is 7.2 stars and standard deviation…

A:

Q: College students average 7.4 hours of sleep per night with a standard deviation of 45 minutes. If…

A: Given data  college students average 7.4 hrs of sleep with standard deviation of 45mins

Q: Score on a certain nation-wide college entrance examination follows a normal distribution with a…

A: Given Information: Mean μ=110 Standard deviation σ=60 To find the approximate percentage that a…

Q: Working in the garden pulling weeds/planting flowers burns an average of 200 calories per hour. If…

A: It is given that  Mean, μ = 200 Standard deviation, σ = 9 Z-Score, Z = ( X - μ )/σ

Q: The average score on the Stats midterm was 70 points with a standard deviation of 6 points,…

A: Given that.   X~N( μ , ?)   μ=70    , ?=6  , Z-score = -1   Z-score =( x - μ )/?

Q: The scores on a standardized test are normally distributed with a mean of 95 and standard deviation…

A:

Q: The scores on a test are normally distributed with a mean of 110 and a standard deviation of 22.…

A: Let X be the random variable from Normal distribution with mean (μ) = 110 and standard deviation (σ)…

Q: A normal population has a mean= 61 and standard deviation=16. what proportion of the population is…

A: From the provided information, Mean (µ) = 61 Standard deviation (σ) = 16 X~N (61, 16)

Q: how do you find the standard deviation when the score is 9 points above tthe mean?

A: = population standard deviation = the size of the population = each value from the population =…

Q: Use Chebyshev's Theorem to find what percent of the values will fall between 120 and 150 for a data…

A: The percentage of observations that are within k std dev. of the mean is 100(1-1k2)%

Q: During the first day of classes for the second semester, the Statistics and Probability teacher of…

A: Answer : - Given data  sample size n = 100                  Sample mean x  = 80.68,   Population…

Q: If the main effect of age is significant, describe the main effect of age. Include the overall means…

A: Main effect in the Analysis of Variance test is the effect of one the independent variable on…

Q: How does the curve change when the standard deviation is the same and the mean changes?

A: The mean is the center of symmetry of a curve or normal density curve.

Q: standardized test has a pop. mean of 152 and a standard deviation of 16. Jenny's z score is -0.56…

A: Given that Jenny's z score= -0.56, Nicole's z score=1.13

Q: The cholesterol levels of a group of young women at a university are normally distributed, with a…

A: Given μ=190σ=37 Let X: Random variable for the cholesterol level of young women Then X~N(190,372)

Q: does the range and standard deviation remain unchanged because the addition of 7 is a constant so…

A: given data  mean = 74 median = 76.5 range = 65 standard deviation = 11 add 7 points to each score…

Q: Change z-score (-2.00) into X value – Mean = 50, standard deviation = 10

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

Q: Systolic  blood pressure values are approximately normally distributed with a mean of 100 mmHg and…

A: According to the given information, we have Systolic  blood pressure values are approximately…

Q: It is possible to have a standard deviation of -1 for some data set? True or False

A: See the below solution

Q: How does one calculate the standard deviation?

A:

Q: Explain an important difference between the standard deviation and the mean.

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Q: The standard error of the mean serves as a special type of standard deviation. Describe about it.

A: Standard error: Standard error is a measure which explains how accurate are the sample means to…

Q: The mean height of women is 62 inches with standard deviation of 4 inches. What percent of women are…

A: From the given information, Mean height (µ) = 62 inches Standard deviation (σ)= 4 inches Thus, the…

Q: The scores on a standardized test are normally distributed with a mean of 90 and standard deviation…

A: The test score is 0.6 standard deviations above the mean is obtained below: From the given…

Q: A student will spend 15 hours average each week in class. If the standard deviation is 2 hours, what…

A: Given that mean=15 and standard deviation = 2 Let, X= number of hours spent by a student in the…

Q: Explain Mean of the Squared Deviations?

A: