Find the percentage of test takers who got:  a) under 80 b) between 68 and 92 c) over 100  d) over 25 e) what is the 40th percentile?

Q: The distribution of the lengths of a commercially caught fish is bell-shaped with mean 24 cm and…

A: the PDF of normal distribution is = 1/σ * √2π * e ^ -(x-u)^2/ 2σ^2standard normal distribution is a…

Q: A data set lists weights (Ib) of plastic discarded by households. The highest weight is 5.21 lb, the…

A: As per our guidelines we are supposed to answer only 3 sub-parts of any question. Hence I am solving…

Q: The lowest and the highest data value of a data set are 12 and 28 respectively, then the approximate…

A:

Q: f. What percent of patients have more than 80 distressing/scary thoughts a day? g. Are these data…

A: The data of 20 patients is given from which it is asked to compute the percentage of patients who…

Q: Find the mean, median, mode, range, variance, and standard deviation for the following data, which…

A:

Q: e types o

A: NOTE: Since there are multiple subparts, we have solved the first three subparts for you. To get the…

Q: You throw a ball as far as you can 5 times, recording the distance for each throw: 165 feet, 184…

A: since only 5 observation is given we will consider them as sample (n = 5)and population (N = 100)…

Q: Determine whether the underlined value is a parameter or a statistic: A total of 12 men have ever…

A: We have given that  Sample size=n=12 Mean=43.92

Q: A given set of data has a specific standard deviation. Describe what will happen to the standard…

A: Standard deviation: it evaluate that how numbers are speared out in data, denoted by s. s= ∑xi-x2n…

Q: n a set of score, the coefficient of variation (in percentage terms) = 50% and standard deviation =…

A: The coefficient of variation is the ratio of the standard deviation to the mean. It is a measure of…

Q: Let X = (5400 4900 6300 6700 )T be the estimates in dollars for the cost of replacing a roof on…

A: Given:                  X=5400, 4900, 6300, 6700 A sample mean refers to the average of a set of…

Q: The HR team collects the age of the staff of three departments and found the mean age of each…

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Q: The ACT is an exam used by colleges and universities to evaluate undergraduate applicants. The test…

A: Given,mean(μ)=22.2standard deviation(σ)=4.9

Q: Suppose the people living in a city have a mean score of 40 and a standard deviation of 7 on a…

A: As per guidelines, we will only solve first three subparts, please repost other questions for more…

Q: 5. Diastolic blood pressures are assumed to follow a normal distribution with a mean of 85 and a…

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Q: Find Mean Deviation : (i) about Mean (ii) about Median, in the following data: 2, 7, 9

A: Given data is2, 7, 9

Q: A researcher measures the amount of food consumed by each dog in her lab. She finds that the mean…

A: It is given that mean amount of food is 12 oz and number of dogs is 16. The sum of squared…

Q: Find the mean and the standard deviation for these ages. b) Draw the boxplot and explain what it…

A: When the data is provided , we can give insight to the data by doing certain plots . Also by…

Q: In which interval are there more men: 220-240 or 280-3407 There are more men in the interval (Choose…

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Q: The average house has 11 paintings on its walls. Is the mean larger for houses owned by teachers?…

A:

Q: If a set of data has a mean of 50 and a standard deviation of 4.5, what is the z-score for a value…

A: If a set of data has a mean of 50 and the standard deviation of 4.5. We have to find the z-score for…

Q: Two individuals a spatial abilities test (mean = 80, std. dev. = 8). One scores a 76 and the scores…

A: From the given information,

Q: What is a common way to measure the center of a distribution of data?   a. scatter plot…

A: The objective of the question is to identify a common statistical measure that is used to determine…

Q: The measure of dispersion which shows the variation about the mean is O a. Standard deviation O b.…

A: It is an important part of statistics. It is widely used.

Q: Refer to the incomplete grouped frequency distribution below. Classes (Rand) 8.00 < 12.00 Frequency…

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Q: Which of the following z scores are above the mean? Choose all that apply.     0     1.35…

A: For normal distribution, the mean is equal to 0

Q: Use the normal distribution of IQ scores, which has a mean of 110 and a standard deviation of 14,…

A: The mean is 110 and the standard deviation is 14.

Q: Find the proportion of Normally distributed observations with a z-score below 2.56. Give your answer…

A: Given Z=2.56

Q: A sample of scores has a mean of ? = 65 and ? = 15. Find the z-scores that correspond to the…

A: We have given that.   X~N( μ , ?^2 )   μ=65 , ?=15   Z-score =( x - μ )/?

Q: a survey of Town X found an average of 3.2 perosns per household and a mean of 1.2 televisions. I f…

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Q: This is a sample of lengths of fruit-fly thoraxes in millimeters. Find the mean and the median Of…

A: Mean refers to the average of a data set. It is obtained by the formula Arrange the data set in…

Q: The scores on the Wechsler Adult Intelligence Scale are approximately Normal, with  = 100 and  = 11.…

A: The scores on the Wechsler Adult Intelligence Scale are approximately Normal

Q: The data are shown below. IQ Scores Younger Sibling 88 107 107 113 78 100 113 108 103 100 Older…

A: Younger (X)  Older (Y) d = X-Y     88 101 -13     107 112 -5 Mean (d) -5.2 107 111 -4 SD (d)…

Q: What proportion of a normal distribution is located above the mean?

A: z-score: z-score is a standardized score which tells about how many standard deviations does a data…

Q: The highway mileage (mpg) for a sample of 8 different models of a car company can be found below.…

A: The highway mileage (mpg) for a sample of 8 different models of a car company is given as:19, 23,…

Q: The average and standard deviation for ACT scores are 20 and 3 respectively. average and standard…

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Q: A standardized test has a pop. mean of 152 and a standard deviation of 16. Molly scores at the 91st…

A:

Q: Calculate the mean and standard deviation for the following distribution : *: 25 35 45 55 65 75 85…

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Q: what percent of the total population is found between the mean and the z-score given? z=3.58

A: We have given that. Standard normal.  X~N( 0 , 1 )   μ =0  , ? =1   Z-score =( x - μ )/?   z= 3.58

Q: Use the frequency distribution to construct a histogram. Does the histogram appear to depict data…

A: Use the frequency distribution to construct a histogram. Weight (g) Frequency 6.000-6.049 3…

Q: The value of the stanard error of the mean for the scores :  1,2,3,4,5 ?

A: Solution: Let X be the random variable. The given data is 1, 2, 3, 4 and 5.

Q: The measure of dispersion which shows the variation about the me O a. Standard deviation O b.…

A: The coefficient of variation (CV) is a statistical measure of the dispersion of data points in a…

Q: A normal distribution of scores has a standard deviation of 10. Find the z-scores corresponding to…

A:

Q: The weights of 6 month-old girls in the United States are Normally distributed with a mean of…

A: From the provided information, Mean (µ) = 16 pounds Standard deviation (σ) = 2 pounds Let X be a…

Q: Draw by hand or in Excel fully labelled curves on a common scale to epresent two sets of scores…

A: a. Mean = 25Standard deviation = 4Mean = 50Standard deviation = 4

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.