A study about the level of happiness is done among SHS students. The scores follow a normal distribution between 1 to 5, which 5 is being the highest. If the population mean is 3 with the standard deviation of 1.7, what is the probabiltiy that the mean level of happiness of 31 students is higher than 4? 3% B) 0.05% 0.03% 5%

Q: Glaucoma is a disease of the eye that is manifested by high intraocular pressure. The distribution…

A: Let X denote the distribution of intraocular pressure in the general population and it approximately…

Q: Consider a sample with a mean of 500 and a standard deviation of 100. What are the z-scores for the…

A: The mean is 500 and the standard deviation is 100.

Q: Suppose the heights of 10-year-old boys in the US vary according to a normal distribution with a…

A: The objective of this question is to find the percentile of a boy with a height of 140 cm given that…

Q: What is the z score for 20 if mean =28 and stadnard deviation =6

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: Suppose that IQ scores have a bell-shaped distribution with a mean of 103 and a standard deviation…

A:

Q: if an approxemitly  bell shaped distribution has a mean of 30 and standard deviation of 5, what…

A: Given that  X~N( μ = 30 , ? = 5 ) μ = 30 , ? = 5 Formula for Z-score Z-score =( x - μ )/?

Q: If the number of degrees of freedom for a chi-square distribution is 21, what is the population mean…

A: Given: Degree of freedom = 21

Q: Do the data support your claim at the 1% level?

A: The summary of the statistics is, The type of test is right tailed test

Q: Hypothesis Tests - 2 samples x C Solved: One of the questions b Answered: The mean numbero x P…

A: Answer:- The independent t-test implies that the means of the two independent populations are…

Q: What is the probability that the mean overall physical activity level of the sample is greater than…

A: Let  X be the random variable from normal distribution with mean (μ) = 100, standard deviation (σ) =…

Q: university in England and each student in a random sample of 38 female students from the same…

A: The following information has been provided: For Males : Sample Mean 1 (Xˉ1)(\bar X_1)= 282282…

Q: uppose that IQ scores have a bell-shaped distribution with a mean of 101 and a standard deviation of…

A: The question is about empirical rule.Given :Population mean of IQ scores (  ) = 101Population…

Q: What is the standard deviation of a dataset with the following values: 10, 12, 15, 18, 20?

A: Standard deviation is a measure of the amount of variation or dispersion of a set of values. A low…

Q: Suppose math scores on the SAT are normally distributed with a mean of 500 and a standard deviation…

A:

Q: What proportion of the students scored lower than 80 if the distribution of these grades can be…

A:

Q: The scores of students on an exam are normally distributed with a mean of 496 and a standard…

A: The mean is 496 and the standard deviation is 67.

Q: If the heights of intramural college basketball players are normally distributed with mean u =…

A: Given,μ=70σ=6.5P(63.5<X<76.5)=?

Q: The mean number of English courses taken in a two-year time period by male and female college…

A: Here we will conduct a 2 independent sample t-test to test the equality of the average number of…

Q: When Rajani goes bowling, her scores are normally distributed with a mean of 125 and a standard…

A:

Q: A certain standardized tests math scores have a bell shaped distribution with a mean of 525 and a…

A: GivenMean(μ)=525standard deviation(σ)=105

Q: Suppose the scores of students on an exam are normally distributed with a mean of 454 and a standard…

A:

Q: a population was normally distributed with a mean of 10 and standard deviation of 2. What…

A: Given data,Mean μ=10sd    σ=2P(X<12.5)=?

Q: If the number of degrees of freedom for a chi-square distribution is 28, what is the population mean…

A: It is known that for chi-square distribution: μχ2=degree of freedom   So,μχ2=28

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 104 and a standard deviation…

A: Given, Mean, mu= 104 Standard deviation, sigma= 17 We know that,  Z score= (X-mu)/sigma

Q: Suppose exam scores in a statistics class are normally distributed with a mean of 89 and standard…

A: Given data, Mean=89 sd=8 P(X<x)=0.45 x=?

Q: The test scores of students in a class test has a mean of 70 and with a standard deviation of 12.…

A: Given,mean(μ)=70standard deviation(σ)=12

Q: are normally distributed with a mean of 100 and a standard deviation of 15. What IQ is in the 90th…

A: Kwe have to find out given probabiity..

Q: f the value of adult male cholesterol is a normal distribution with a mean of 198 and a standard…

A: The question is about normal dist. Given : Mean of cholesterol value of adult male ( μ ) = 198 Std.…

Q: Suppose the test scores in a class are normally distributed with a mean of 70 and a standard…

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: Suppose that IQ scores have a bell-shaped distribution with a mean of 100 and a standard deviation…

A:

Q: Assume that an intelligence test scores are distributed normallt with a mean of 100 and a standard…

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

Q: Suppose the scores of students on an exam are normally distributed with a mean of 558 and a standard…

A:

Q: Suppose that IQ scores have a bell shape distribution with a mean of 105 and a standard deviation at…

A: Solution: Let X represent the IQ scores of students.  The distribution of X is bell shape…

Q: Suppose the scores of students on an exam are normally distributed with a mean of 253 and a standard…

A: From the provided information, Mean (µ) = 253 Standard deviation (σ) = 80

Q: The admission committee of AUCA enrolls 60% of those who took the exam. If the scores follow a…

A:

Q: Suppose that IQ scores have a bell-shaped distribution with a mean of 103 and a standard deviation…

A:

Q: In a standardized exam the mean score is 400 with a standard deviation of 50. If a random sample of…

A: Given that  μ= 400 , σ= 50 , n = 25

Q: A deviation score of 0.00 indicates that the individual

A: Z score: The value of the Z score gives the raw score is how many standard deviations away from…

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…