is supposed to have 20% Seniors. We currently have 1200 The population of students at OHS. (What is the expected number of seniors? What is 20% of 1200?) There are currently 268 seniors. What is the chi-square test statistic for this class?

Q: Approximate the mean of the random variable X based on the simulation for 25 games. hits

A: The sample size is 25.

Q: What is the expected value (mean) of X?

A:

Q: A sample of n = 4 scores with M = 43 is selected from a normal population with µ = 40 and with σ =…

A: 1] Sample size n=4 2] Population mean μ= 40 3] population standard deviation σ=8 4] sample mean M=43…

Q: Find the expected value of the above random variable.

A: The probability distribution is, Probability Scores 0.35 1 0.1 4 0.15 6 0.15 7 0.20 13…

Q: A random sample of size n = 244 is taken from a population of size N = 5,200 with mean μ = −73 and…

A:

Q: CNBC (2018) reported 75% of households are using streaming services compared to standard cable. What…

A: here given , CNBC (2018) reported 75% of households are using streaming services compared to…

Q: For a normal population with µ = 100 and σ = 9, what is the probability of obtaining a sample mean…

A: According to the given information, we have Mean = 100 Standard deviation = 9 Sample size = 25

Q: Researchers developed a "cat IQ test" and find that the population of cats in the United States has…

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

Q: Mean = 126 millimeters,variance = 64,if a random sample of 37 bolts is selected,what is the…

A:

Q: suppose a random variable x arises from a binomial experiment. suppose n=6, and p=0.13. How do I…

A: The mean of binomial random variable is given and calculated as follows:

Q: ion, the successive trials are all dependent? True/false,reason?

A: Negative binomial distribution is a discrete probability distribution which is used to represent the…

Q: What happens to the statistic when n becomes larger?

A: we know that the Statistics are numbers that summarize data from a sample.

Q: If n=15 and P=0.1, would normal distribution provide accurate probabilities?

A: Normal to binomial approximation :  For a random variable X with a Binomial distribution with…

Q: A population mean is 13. The sample mean is 12.8, and the sample standard deviation is 2. The sample…

A: Given that,

Q: Question 1. In a random and independent sample of 1000 students 80% of them were in favor of longer…

A: The formula of the expected proportion is,

Q: 95% of students at school are between 1.1m and 1.7m tall. The Z-score is 3m.  determine the…

A:

Q: What is the expected profit if Yaster Inc. produces and sells 22,798 thingamabobs? $ Round to the…

A:

Q: 17. If the random variable Y has a chi-square distribution with 54 degrees of freedom, then what is…

A:

Q: A statistic is a random variable that depends only on the observed sample. True False

A: We have  Statistic: The function of sample.  i.e a random variable which depends on the sample

Q: A random sample of n = 25 scores is obtained from a normal population with µ = 30 and σ = 6. What is…

A: The sample size is 25, population mean is 30 and population standard deviation is 6. The probability…

Q: probability that the 7th message is received within 20 seconds?

A: Given: X=Number of messages sentX~Poisson(λ=20)λ=20 per minute The probability density function for…

Q: What increases the likelihood that our a random sample will be representative of the population? O…

A:

Q: 12 dice are thrown 3086 times and a throw of 2, 3 or 4 is reckoned as a success. Suppose that 19142…

A:

Q: A normal distribution has μ = 368 and σ = 42.When samples of n = 36 are taken: What is the expected…

A: A normal distribution follows a bell shaped curve which is centred at the mean and it is also called…

Q: Assume that you have a binomial experiment with p = 0.5 and a sample size of 100. The expected value…

A: From the given information, Binomial experiment with p = 0.5 and the sample size is n =100.

Q: What is the expected value of an exponential randomvariable?

A: Exponential random variable. For a positive constant k>0, the exponential density function (with…

Q: Assume that you have a binomial experiment with p = 0.7 and a sample size of 78. The expected value…

A: Given data, p=0.7 n=78 Expected value =?

Q: In a Binomial experiment where the number of experiments is N = 50 and the probability of the event…

A: Given: N=50p=0.4q=1-p=0.6 The normal approximation of binomial distributiion states that,  If…

Q: (1) With a known population mean of 50 and a known standard error of 4, what is the probability of…

A: Given that  X~N( μX̄ = 50 , ?X̄ =4)  μX̄ = 50 , ?X̄ =4

Q: 17. If the random variable Y has a chi-square distribution with 54 degrees of freedom, then what is…

A: Percentile.   A value x is said to be p th percentile if there are p% of the observations are less…

Q: Consider a binomial experiment with n = 20 trials and p = 0.40. (a) Find the expected value (u) and…

A:

Q: Although studies continue to show smoking leads to significant health problems, 20% of adults in the…

A: Given Information: p = 20% = 0.2 Sample size n = 250 Let X be a random variable which denotes the…

Q: a. What is the probability of X when X=-1? b. What is the expected value of the random variable X?…

A:

Q: A random sample of 300 physicians shows that there are 50 of them who make at least $200,000 a year.…

A: Given,n=300x=50p^=xn=50300=0.1667H0:P=0.20H1:P<0.20

Q: Mean = 126 millimeters-variance=64-if a random sample of 37 bolts is selected , what is the…

A:

Q: A normal population distribution has a sample mean of u=65. What is the expected value of the mean…

A: The objective is to find the expected value of the mean. From the available information ,  A normal…

Q: What is the Discrete Variance when sample size is 82 with a probability of 0.82?

A: Formula for variance : Variance = np(1-p)

Q: When comparing two independent population means, if n1 = 13 and n2 = 10, degrees of freedom for the…

A: We have given that  n1 = 13,    n2 = 10  We know that the degrees of freedom for two independent…

Q: In a population, a parameter called "mobent" has a value of 9. If the statistic estimating mobent is…

A: Step 1 A statistic is unbiased if the mean of the sampling distribution of the statistic, also…

Q: In chemical trials, a certain drug has 0.8 success rate of curing a known disease. If 15 people are…

A:

Q: b) Explain why the statistical properties of a random variable (RV) is expected to change if RV is…

A: The answer is explained below as follows.

Q: Suppose that you randomly draw one card from a standard deck of 52 cards. After writing down which…

A: In a deck of cards, the total number of cares is 52 and the numbers of diamonds is 13.

Q: According to Harper's Index, 60% of all federal inmates are serving time for drug dealing. A random…

A: Solution: Let X be the number of inmates serving time for drug dealing and n be the sample number of…

Q: ? = 60?2+39X Calculate the mean (expected value) of the random variable

A: Solution:

Q: 2. During my office hours (from 12pm to 6pm), an average of about 1 student per hour comes in for…

A:

Q: A simple random sample of size 144 is selected from a population with p = 0.5. 4a. What is…

A: Given: n=144 p = 0.5

Q: Would it be unusual for an data value to be more extreme than 4.76 standard deviations from the…

A: Hey there! Thank you for posting the question. However, since your question has more than 3 parts,…

Q: What is the expected value of X²?

A:

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.