Q: The data set has size 60. Approximately how many observations lie within three standard deviations…

A: From the empirical rule

Q: The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is…

A: Solution Here we will use one sample t test to test the mean amount of summer rainfall for the…

Q: On a statistics exam, the mean score was 80 and there was a standard deviation of 7. If a student's…

A: Given data, μ=80σ=7If x=92z=?

Q: A quantitative data set of size 70 has mean 25 and standard deviation 4. at least how many…

A: It is given that the mean is 25 and standard deviation is 4.

Q: At the shot put event the mean was a throw of 44.22 feet, with a standard deviation of 3.65 feet.…

A:

Q: The trunk diameter, in centimeters,  of a certain variety of pine tree is represented by X~N(150,…

A: Let X denote the trunk diameter in centimetres of a certain variety of pine tree and it follows…

Q: In a recent year, the ACT scores for high school students with a 3.50 to 4.00 grade point average…

A: The mean is 25.7 and the standard deviation is 3.3.

Q: A national achievement test is administered annually to 3rd graders. The test has a mean score of 80…

A: A national achievement test is administered annually to 3rd graders. The test has a mean score of 80…

Q: If the dispersion is small the, the standard deviation is........?

A:

Q: A z-score of −1 tells us that a score fell one standard deviation below the mean in a group of…

A: Empirical rule: For a normal distribution, the approximate values that fall in the specified…

Q: On a recent quiz, the class mean was 76 with a stanbard deviation of 3.1. Calculate the z score (to…

A:

Q: At my work there is a fancy coffee machine that dispenses 120 ml of coffee, but I believe that the…

A: Given data and calculation for sample standard deviation is shown below Hypothesized mean = 120 ml…

Q: The grades on a midterm were Normally distributed with a mean of 120 and a standard deviation of 17.…

A: GivenMean(μ)=120standard deviation(σ)=17

Q: For the normal distribution of burning times of electric light bulbs, with a mean equal to 1200…

A:

Q: Suppose scores on the SAT exam are normally distributed with mean 1100 and standard deviation 200.…

A: The normal distribution: A continuous random variable X is said to follow normal distribution with…

Q: A quantitative data set has size 40. At least how many observations lie within two standard…

A: Introduction: Suppose X is a random variable with expectation, μ and standard deviation, σ. Then,…

Q: For a population with a standard deviation of σ = 6, what is the z-score corresponding to a score…

A: We are given:

Q: The data set has size 50. Approximately how many observations lie within one standard deviation to…

A:

Q: A quantitative data set has size 80. At least how many observations lie within two standard…

A: It is given that a quantitative data set size is 80.

Q: A score that is 6 points below the mean corresponds to a z-score of z = -2.00. What is the…

A: Given: z-score = -2.00 Formula: Where,

Q: The monthly income of residents of Daisy City is normally distributed with a mean of $3000 and a…

A: GivenMean(μ)=3000standard deviation(σ)=500

Q: A normal distribution has a mean of 60 and a standard deviation of 20. Barbara's score is 40. What…

A: It is given that the Normal distribution has a mean 60 and a standard deviation of 20.  Suppose X be…

Q: For a population with a standard deviation of σ = 5, what is the z-score corresponding to a score…

A: We have to find z score..

Q: The average temperature in a town in January is 22.1 oF and the standard deviation is 7.5 pF. What…

A: we have to find average temperature  in Celsius  from given data. given data : mean = 22.1.of…

Q: On a standardized exam, the scores are normally distributed with a mean of 650 and a standard…

A:

Q: Find the range and standard deviation for the data items in the histogram below. 5 4 Frequency

A: From the histogram, The frequency table is, Data Frequency 10-20 2 20-30 5 30-40 5 40-50…

Q: If you score 76 on a commercial pilot exam that has a mean score of 70 and a standard deviation of…

A: We have to find given percentile ....

Q: In 1970, adults who were 18 years or more had a mean systolic blood pressure (SBP) of 148 mm Hg.,…

A: Given that in 1970 adults who were 18 years or more had a mean systolic blood pressure (SBP) of 148…

Q: A population of 31 scores has a sum of squared deviations value of SS = 250.03. What would be the…

A: Given that the population size is 31. Sum of squared deviations is SS=250.03.

Q: The scores on the final exam in a statistics course are close to being normally distributed. The…

A: Normal distribution: It is a continuous probability distribution, that is bell-shaped with lighter…

Q: A quantitative data set has mean 19 and standard deviation 2. Approximately what percentage of the…

A: Given that, A quantitative data set with, Mean = 19 Standard deviation = 2

Q: What is the difference between the standard deviation and CV? When it is appropriate to use each…

A: Standard deviation: It is square root of variance. It is obtained by taking square root of sum of…

Q: The average income of a graduate from the University of Eastern West Virginia is $50,000 per year,…

A: X follows a Normal distribution with mean = 50000 and S.D = 2500 Then z=(x-mean)/SD =…

Q: .Use the data to lation mean and andard deviation

A: x (x-xbar)^2 92 22.09 103 39.69 99 5.29 108 127.69 86 114.49 94 7.29 90 44.89 102…

Q: The data set has size 90. Approximately how many observations lie within two standard deviations…

A: The Empirical Rule states that 99.7% of data observed following a normal distribution lies within 3…

Q: The credit scores of 35-year-olds applying for a mortgage at Ulysses Mortgage Associates are…

A: (a) Obtain the credit score that defines the upper 5 percent. The credit score that defines the…

Q: f the class average is 84

A: Here it is given that - Mean (μ) = 84 Standard Deviation (σ) = 5 Let, X be a random variable which…

Q: The data set has size 40. Approximately how many observations lie within two standard deviations to…

A: 68-95-99.7-rule: Let X be an observation from a normal distribution, having mean µ and standard…

Q: On an exam, Tom scored 8 points above the mean and had a z-score of +2.00. The standard deviation…

A: Given: z-score=2 Score above the mean=8

Q: Find the z-score when x is 5, mean equals 7, and standard deviation 3.

A: Solution: Let X be the random variable. Then, the z-score is calculated by using the formula

Q: A given distribution has a population mean, μ, of 136 and a population standard deviation, σ, of 12.…

A: Given, Mean(μ) = 136 standard deviation ( σ) = 12 raw score (x) = 147

Q: Find the standard deviation (rounded to the nearest unit) for the data indicated. Test Score…

A: Given Information:

Q: A medical laboratory tested 8 samples of human blood for acidity on the pH​ scale, with the results…

A:

Q: A given distribution has a population mean, μ, of 142 and a population standard deviation, σ, of 10.…

A: It is given that the mean (µ) is 142 and the standard deviation (σ) is 10 and score, x is 110.

Q: The Weather Underground reported that the mean amount of summer rainfall for the northeastern US is…

A: Solution: State the hypotheses. Null hypothesis: That is, the mean amount of summer rainfall for…

Q: The data set has size 80. Approximately how many observations lie within two standard deviations to…

A: Empirical rule: On a normal distribution about 68% of data will be within one standard deviation of…

Q: me mean is 225 and the standard deviation is 28 for a normally distributed variable, what is the x…

A: The Z-score of a random variable X is defined as follows: Z = (X – µ)/σ. Here, µ and σ are the mean…

Q: The Fresha Tea Company pack tea in bags marked as 250 g. A large number of packs of tea were weighed…

A: Mean = 255g Standard deviation = 2.5g P(X < A) = P(Z < (A - mean)/standard deviation) P(X <…

Q: Suppose a class average on a test is 75 and the standard deviation is 10. if joe scores 80 on the…

A:

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.