Find the confidence limits for the mean if x= 84.
Q: For a list of positive numbers, is it possible for the standard deviation to be greater than the…
A: Mean: The mean defines that the center or average of the data and it is calculated by the sum of the…
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A: Skewness is used to measure the shape of the distribution. There are three types of skewness, they…
Q: A sample of n=5 scores has a mean of x=9. what is Ex for this sample?
A: Mean = 9 n = 5
Q: A population with a mean of µ = 15 has 40 scores. What is X?
A:
Q: Find the z-score for the value 69, when the mean is 96 snd the standard deviation is 5. z-score= ?
A:
Q: For an educational study, a volunteer must place in the middle 50% on a test. If the mean for the…
A:
Q: When data is normally distributed the mean equals the median True False
A: Normal distribution
Q: What score would be necessary to obtain a grade A
A: Observe the given figure carefully. Assuming that the top interval represents the range of marks…
Q: if Y=3X+7 , find the standard deviation of Y.
A:
Q: The chloride concentration in the blood (mmol / liter) averages 104 with a standard deviation of 5.…
A: Given Data: Let X represent the random variable X~ Normal (104, 52) n=200 Therefore, X¯ ~ Normal…
Q: Between the mean and median, determine which would be a better estimator given that a sample…
A: The sample mean is, x¯=∑xn=3+8+26+14+125=635=12.6 The data in the ascending order is 3, 8, 12, 14,…
Q: For any population, the sum of the deviation scores will be always equal to zero. true or false
A: Sum of deviation is given as: ∑i=1n(xi-a) Where, a=any arbitrary constant.
Q: A researcher found that a 95% confidence interval for the mean hours per week spent studying by…
A: The 95% confidence interval is given by (13,17)
Q: Suppose you have a test with a mean of 66 and a standard deviation of 5. If you first increase…
A: Given Mean =66 Standard deviation=5
Q: A federal report indicated that 17% of children under age 6 live in poverty in Nevada, an increase…
A: Given data, p=17%=0.17 E=2%=0.02 z-value at 99% confidence is Zc=2.576 n=?
Q: mean of μ = 78. If your score is X = 70, which standard deviation would give you a better grade: σ…
A: A distribution of exam scores has mean µ=78, and σ2=42 i.e. X~N(µ=78, σ2=42) If exam score is x=70,…
Q: A group of data has a mean of 65 with a standard deviation of 5. What z-score is possible if the…
A: According to the provided information,
Q: Assume that IQ scores are normally distributed with μ = 100 and σ = 15 What percent of IQ scores…
A: The normal distribution is the most useful theoretical distribution for continuous variables. For…
Q: For a population, a deviation score is computed as X – σ.
A: What is Deviation score ? Deviation score is basically a degree of score from which a raw score is…
Q: Explain the relevance of mean and standard deviation to someone who does not know what they are. .…
A: Mean: The mean is a measure of central tendency. It gives an indication of the average value of a…
Q: What is the Differences Between Predicted and Observed Values
A:
Q: Suppose the correlation, r, between two variables x and y is -0.44. What would you predict about a y…
A: The correlation, r between two variables x and y is provided as – 0.44. Since, the regression line…
Q: Is it possible for the standard deviation of a list of numbers to equal 0? If so, give an example.…
A: Standard deviation refers to the spread in the data set. If the standard deviation equals zero, it…
Q: The mean of a distribution is 291, while the median is 217. Which of these statements is likely to…
A:
Q: The standard error of the mean is essentially the standard deviation but used when you are comparing…
A: Here use basic of standard error
Q: Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 65…
A: Given data: Mean μ=65 standard deviation σ=5
Q: The estimate of the standard error of the mean is computed as?
A:
Q: find standard deviation if range is 3.
A: Given: Range = 3
Q: A sample with a mean of 8 has ∑ x = 72. How many scores are in the sample?
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Q: A distribution of scores has a median of 84 and a mean of 80. Based on this information it appears…
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Q: Assume that women's weights are normally distributed with a mean given by mean=143 lb and a standard…
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Q: The mean of a data ser is 70. The standard deviation is 2. Between what Value is 95% of data found…
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Q: if the variance of the water temperature in a lake is 28°, then for how many days would a researcher…
A: It is given that margin of error (E) is 3 and the confidence level is 99%.
Q: A marketing researcher wants to find a 95% confidence interval for the mean amount that visitors to…
A:
Q: In the same class, Idris scored 82% on a test with a z-score of 1.5 while Malik got 54% with a…
A: From the provided information, Idris scored 82% on a test with z score of 1.5 and Malik got 54% with…
Q: A school district requires all graduating seniors to take a mathematics test. This year, the test…
A:
Q: what is the formula for finding the inter quartile range
A: Quartiles:Three Quartiles,The first quartile separates the lowest 25% of the observations from the…
Q: A population has µ = 50. Which value of σ would make X = 55 an extreme value out in the tail of the…
A: Given µ = 50 X = 55
Q: A distribution of exam scores has a mean of μ = 78. If your score is X = 80, which standard…
A:
Q: How many Biology students’ records need to be sampled to estimate the percentage who earn "A"s to…
A: The proportion is not provided therefore in worst case it can be assume as (p) 0.5. Margin of error…
Q: What are the endpoints of the interval estimator for B2 with a 99% interval estimate?
A: Given: Sample size, n=62 Regression equation is - y=97.25+33.74xStandard error β1=3.86Standard error…
Q: What is the statement of the Mean Value Theorem?
A:
Q: After 3 points have been added to every score in a sample, the mean is found to be M= 83 and the…
A: After 3 points have been added to every score in a sample, the mean is found to be M= 83. The value…
Q: mean is 72 and standard deviation is 8 what is P( x ≤ 72)
A: Given,mean(μ)=72standard deviation(σ)=8
Q: Give the standard deviation of X1.
A: First we have to calculate the marginal density of X1 and then we will find standard deviation of…
Q: For every set of data the value of the trimmed mean will always be one of the original items of…
A: Here we want to know the given statement is true or not.
Q: 2. On a standardized test, Sara had a score of 81, which was exactly 2 standard deviations below the…
A: Given : Test score = X = 81 Standard deviation = σ = 3
Q: An electric company wishes to estimate the true mean lifetime of its bulbs. It desires to be 98%…
A: Given: Lifetime of bulbs = X Confidence level = 98% Within 25 hours . This is margin of error.…
Q: Suppose that, for a certain exam, a teacher grades on a curve. It is known that the mean is 70 and…
A: Solve
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