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Statistics Questions
Statistics Questions
A real estate investor thinks the real estate market has bottomed out. One of the variables he examined to arrive at this conclusion was the proportion of houses sold at or above the asking price. Last year, the proportion of houses sold at or above the a
A company that manufactures helmets wants to test their helmets to make sure they pass SNELL certification. One of the tests the helmets are required to undergo is a test that simulates real-world impacts. During the test, crash dummies must, on average,
A professional baseball player changed his throwing motion to increase the velocity of his fastball. Before the change, the player threw his fastball at an average of 91 miles per hour. After the change in his throwing motion, the team watched him throw 6
From time to time, unfortunately, Healthy Life employees have to deal with insurance fraud. Say, some people claim medical services that have never been provided or money they never paid. To that end, Healthy Life hired a number of investigators whose fun
Jennifer’s manager Dr. Jonathan Steinberg wonders whether Healthy Life members needed more chiropractic help in 2019 than in 2018, on average. Jennifer selected a random sample of those who were treated by chiropractic doctors in both years. Data provided
Loan Repayment
Loan Repayment
Exercise 08.02 Algo (Population Mean: Sigma Known)
Use the Financial database from Excel File (drive). Use Total Revenues, Total Assets, Return on Equity, Earnings Per Share, Average Yield, and Dividends Per Share to predict the average P/E ratio for a company. Use Excel to perform a forward selection r
Billy wants to test whether the average speed of his favorite pitcher’s fastball differs from the league average of 92 miles per hour. He takes a sample of 36 of the pitcher’s fastballs and computes a sample mean of 94 miles per hour. Assume that the stan
stats
statistics questions
Suppose a workstation receives parts automatically from a conveyor. An accumulation line has been...
In a survey of a group of men, the heights in the 20-29 age group were normally distributed, with a mean of 68.7 inches and a standard deviation of 3.0 inches. A study participant is randomly selected. Complete parts (a) through (d) below.
In a survey of a group of men, the heights in the 20-29 age group were normally distributed, with a mean of 68.7 inches and a standard deviation of 3.0 inches. A study participant is randomly selected. Complete parts (a) through (d) below.
Exercise 17-11: Feeling Rushed?
What is normal, when it comes to people's body temperatures? A random sample of 130 human body temperatures had a mean of 98.15° and a standard deviation of 0.74°. Does the data indicate that the average body temperature for healthy humans deviates from 9
What is normal, when it comes to people's body temperatures? A random sample of 130 human body temperatures had a mean of 98.15° and a standard deviation of 0.74°. Does the data indicate that the average body temperature for healthy humans deviates from 9
Finding marginals with respect to X and Y
Two researchers conducted a study in which two groups of students were asked to answer 42 trivia questions from a board game. The students in group 1 were asked to spend 5 minutes thinking about what it would mean to be a professor, while the students i
Assume z is a standard normal random variable. Compute the following probabilities.
A Monster.com pool of 3,057 individuals asked, "What’s the longest vacation you plan to take this summer?" The following relative frequency distribution summarizes the results.
null hypothesis
Chapter 6 and 7 practice problems
Chapter 6 and 7 practice problems
Probability Density
statistics
The Wall Street Journal
If 68% of all of Mr. Bree's Statistics students watched "The Office" while practicing social distancing at home, find the probability that in a sample of 35 students . . .
Show that median is an unbiased estimator of population mean when population is normally distributed .
Two-Sample T-Test and CI: height, gender
Find the given data
Find the given data
Find the given data
can all answer this question for me?
Find the Z-score corresponding to the minimum and maximum in the data set. I have already calculated the mean and standard deviation, but please help with questions 3, 4, and 5. This is a sample data set.
Sampling methodology
Simple Random sample size
Probability
HW 5 - Ch 6 & 7 Jaggia, Business Statistics: Communicating with Numbers, 3e (eBook) HW Question
HW 5 - Ch 6 & 7 from Jaggia, Business Statistics: Communicating with Numbers, 3e (eBook)
A researcher wishes to estimate, with 99% confidence, the population proportion of motor vehicle fatalities that were caused by alcohol-impaired driving. His estimate must be accurate within 5% of the population proportion. (a) No preliminary estima
Probability Density Function of X
Show that the mean of a random sample of size n is a minimum variance unbiased estimator of the parameter of a Poisson population.
probability
Time series analysis.
The Bernoulli random variable takes values 0 and 1, and has probability function f(x) = (p^x) [(1 − p)^(1−x)]
In the general population, IQ is normally distributed with a mean 100 and standard deviation 15.....
Statistics
Let X equal the larger outcome when a pair of 6-sided dice are rolled.
Help with Pascal’s triangle and binomial coefficients
Let X be a discrete random variable with probability function f(x). Prove that E[a + b g(X) + c h(X)] = a + bE[g(X)] + cE[h(X))], where g and h are functions, and a, b and c are constants.
Let a random variable X have the p.f. f(x) = c(|x| + 1)2 for x = 0, ±1. Find the constant c so that f(x) is a valid probability function. Then, find E(X), E(X2 ) and var(X).
The spreadsheet linked above contains various housing...
Let X1,X2,..,Xn be i.i.d. random variables with f(x; θ) = 3e^(3(θ-x)), if x >=θ, 0 lese, θ being unknown parameter
Let X be binomial with parameters n and p. Evaluate E{X(X − 1)} from first principles (i.e. the definition of expectation), and hence, derive var(X). You may assume linearity of expectation, and that E(X) = np.
Joint probability function
Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of 10 Allen's hummingbirds has been under study in Arizona. The average weight for these birds is x = 3.15 grams. Based on previous studies, we can a
Z-score less than or equal to -2 or consider a value significant high for its z score
Continuous random variable
Likelihood & K-M estimate
Weibull Likelihood function
Assume that 12 jurors are randomly selected from a population in which 72% of the people are Mexican-Americans.
Christmas A recent survey revealed that American’s Christmas spending averaged $830. Use this as the population mean American’s Christmas spending. Suppose American’s Christmas spending is normally distributed with a standard deviation of $220. Random sam
A town recently dismissed 8 employees in order to meet their new budget reductions. The town had 7 employees over 50 years of age and 16 under 50. If the dismissed employees were selected at random, what is the probability that no more than 1 employee was
Please answer A and C as I am stuck
Study of 420,096 cell phone users
Let X1, X2 be a random sample from N(0, 1). What is the distribution of each of the following? a. (X2 − X1)/ √ 2 b. (X1 + X2) 2/(X2 − X1) 2 c. (X2 + X1)/ p (X1 − X2) 2 d. X2 1 /X2 2
Decision rule
Statistics Reliability
A standardized exam
For the mathematics part of the SAT the mean is 514 with a standard deviation of 113, and for the mathematics part of the ACT the mean is 20.6 with a standard deviation of 5.1. Bob scores a 660 on the SAT and a 27 on the ACT.
For the mathematics part of the SAT the mean is 514 with a standard deviation of 113, and for the mathematics part of the ACT the mean is 20.6 with a standard deviation of 5.1. Bob scores a 660 on the SAT and a 27 on the ACT.
A survey of 430 randomly chosen adults found that 21% of the 222 men and 18% of the 208 women had purchased books online. A researcher used a Z Test Difference of Proportions to investigate this observed difference in proportions and calculated p-value 0.
Probability of Binomial Event
ratio, interval, nominal, and ordinal data
Chart of Refine Result
Conditional distribution given joint density of (X,Y)
Bias
Please help with 4. a) b) c)
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