A population with a mean of u = 8 has EX = 40. How many scores are in the population?

Q: . Claim: The mean IQ score of statistics professors is greater than 118. Sample data N=50, x=120,…

A:

Q: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 Ibs with a…

A:

Q: Mean 255, x is 230 and z score is -2 find standard deviation

A:

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 student calculates the value of r as +0.72 for a question comprising 5 pairs of observations and…

A:

Q: The first three moments of a distribution about the value 2 are 1, 16 and-40 show that the mean is…

A:

Q: In a herd of longhern cattle the mean horn length is 52cm and h2 is 0.2. Predict the mean horn…

A: Heritability is a measure of additive effects of genes, it tells whether the observation variation…

Q: A sample of 3000 persons were surveyed for their weight in pounds, the mean weight is 135 lbs with a…

A: Consider that the mean and standard deviation of a random variable X are µ and σ, respectively.…

Q: A sample of n=8 scores has a mean of M=7. If one score is changed from X =20 to X =4, what is the…

A: Consider the first 7 scores is x1, x2, x3, x4, x5, x6, x7 and the 8th score is, x8=20. The formula…

Q: If a person is making the third quartile salary for a CPA they are making less than what perc

A: Given: As,

Q: The results for a blood test for a certain disease are shown in the tab below. Let D represent…

A: here True positive = 290 False negative = 3219

Q: A population has µ = 50. Which value of o would make X = 55 an extreme value out in the tail of the…

A: Part 1: Given μ=50              To find for what value of σ, X=55 will be an extreme value In the…

Q: After surveying 625 potential voters polled, you find out that 325 support candidate X and 300…

A: Given information: A total sample of 625 potential voters. 325 out of 625 support candidate X. 300…

Q: Find the standard deviation of the reaction times. 0.7

A: Let X denote the reaction times of a drug. We have to calculate the SD of sample of size n = 12

Q: that the mean score of these 53 students is 147.9. Is this significantly different from the national…

A: Given: Sample size, n = 53 Mean,  Population mean,  standard deviation,

Q: A researcher reports an F-ratio with df= 2, 18 from an independent-measures research study. Based on…

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

Q: Diastolic blood pressure in adults is normally distributed with m = 80 mm Hg and s = 12 mm Hg. In a…

A: The probability that diastolic blood pressure below 70 mm Hg is,

Q: A researcher calculates the variance of her sample to be s = -6. , what would you tell the…

A: Here's the explanation for this as follows; The sample variance, s², is used to calculate how varied…

Q: A score that is 3 points lower than the sample mean has a z-score of z = -0.25, and a score of X =…

A: Given information: Case-1: z = -0.25  Score (X) = u-3  Sample mean (u) = u  Case-2: z = -0.75  X =…

Q: . A population with a mean of 10 has EX 250.How many scores are in the population?

A: Note: Hey there! Thank you for posting the question. For calculating number of scores in the…

Q: A sample of n = 5 scores has a mean of X-bar = 9. What is ∑X for this sample?

A: From the provided information, Sample size (n) = 5 Mean (x̅) = 9

Q: Claim: The mean pulse rate (in beats per minute) of adult males is equal to 68.8 bpm. For a random…

A: Given that  Claim : The mean pulse rate of adult males is equal to 68.8 bpm. Sample size (n) = 144…

Q: The Department of Health wishes to determine the percentage, p, of the general population who are…

A: Given : The test for Cooties is known to be 99% accurate given that a patient is infected and 90%…

Q: Find the z-score associated with the ACT score X = 26 %3D Find the ACT score from the dataset…

A: Our aim is to find the following :  (a) Z-score for X=26 (b) ACT score for Z=1.064

Q: Find two z - values, one positive and one negative, that are equidistant from the mean so that the…

A: The areas in the two tails total 34%. The two z values are, Pz1<Z<z2=0.34 For,…

Q: A manufacturing company claims that the average lifetime of their incandescent lamps is 1300 hours.…

A: We have given that data. From data i want to calculated. Mean = sum of all observations/total number…

Q: Samuel Morse determined that the percentage of a's in the English language in the 1800s was 8%. A…

A: Denote p as the true proportion of a’s in modern newspaper. It is reported that proportion of a’s in…

Q: If a person is making the third quartile salary for a CPA, they are making less than 50 V o 50 % of…

A: It is a graph that shows five number summaries of the data. Minimum, first quartile, median, third…

Q: A sample of  n= 5  scores has a mean of 12 . If one new score with a value of  x=18 is added to the…

A: Given information- Sample size, n = 5 Sample mean = 12 Since we know that-

Q: 0, Find the mean and variance of X.

A:

Q: A value of 104.2 would be how many standard deviations above the mean, given a mean of 100, and a…

A: Solution: From the given information, µ=100 and a standard deviation σ=5.6.

Q: An individual is selected from a normal population with a of μ = 80 with σ= 20, and a treatment is…

A: It is given that the mean is 80 and the standard deviation is 20.

Q: A grocer finds that the cantaloupes in his store have weights with mean 0.7 kg and standard…

A: Given, Mean weight of cantaloupes is 700 gm. Standard deviation is 53 gm

Q: The first four moments of a distribution about the value 4 of the variable are-1.5, 17, -30 and 108.…

A:

Q: Assume that anxiety scores as measured by an anxiety assessment inventory are normally distributed…

A: Since there are 2 different questions, as per Bartleby rules, I am submitting 1st question. Please…

Q: What should we do with a small p-value?

A: The P-value is the probability we get the value of the test statistic, or something "more extreme"…

Q: a population has mean score of 50 if five points are added to each score what is the new mean

A: GivenThe population mean = 50Mean is the average of all the data points in the data distribution. It…

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: 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: The approximate​ Z-score that corresponds to a right tail area of 0.42 is

A:

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: When X; only takes two values {0, 1}, what are the possible values of the estimates of p?

A: Solution : Given that , X1,X2,...........Xn be a random sample from population.Considering…

Q: Based on the above, he est statistic is equal to?

A: It is given that Sample size n = 30 Sample mean = 14 Sample SD = 14 Level of significance = 0.05

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

A:

Q: For a population with a mean of μ = 70, a score of X = 64 corresponds to z = −1.50. What is the…

A:

Q: According to the Distribution of Z table, ______ % of area is above a Z value of 0.82?

A: The normal curve is very helpful to know the area is below, above and between a Z value. If we can…

Q: A population with a mean of u = 8 has EX = 40. How many scores are in the population? %3D

A: Given information- Mean, µ = 8 ⅀X = 40 We have to find how many scores are in the population. Let, N…

Q: A sample of n = 5 scores has a mean of M = 8. if one new score with a value of X = 2 is added to the…

A:

Q: If you roll one six-sided die and X = the # on the die.   What is the mean value of X?

A:

Q: - What percentage of guesses fell between z-scores of -1.0 to +2.0?

A: