Statistics-And-Probability Questions

##### Hi, I am a bit confused why we can not use variance for discrete values and...

##### Suppose you and three friends, Allan, Bella, and Chris, are designing a study to measure the...

##### 1.In a nationwide survey of n = 500 adults, the sample proportion who answered yes to...

##### Question 10 options: A department has 5 machines that each run for an average of 8.4...

##### Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of...

##### Sixty-five randomly selected car salespersons were asked the number of cars they generally sell in one...

##### Please interpret the output below. What type of test was used and why? Are energy costs...

##### Let X ∼ N (0; σ2) and Y = | X |, where σ> 0. Obtain...

##### Imagine your company wants to create a loyalty program with a tiered reward structure (e.g., top...

##### Consider the experimental results for the following randomized block design. Make the calculations necessary to set...

##### Determine the mean and variance of a random variable with uniform distribution in the interval [a;...

##### 2. Find the z value to the left of the mean so that a 97.77% of...

##### A national publication reported that a college student living away from home spends, on average, no...

##### 1) Four fair coins are tossed. Find the following probabilities: a) P(getting 2 heads and 2...

##### How much do wild mountain lions weigh? Adult wild mountain lions (18 months or older) captured...

##### Suppose a simple random sample of size n=200 is obtained from a population whose size is...

##### A corporation must appoint a president, chief executive officer (CEO), chief operating officer (CCO), and chief...

##### There have been complaints that resident physicians and nurses at the RWJ Hospital desk respond slowly...

##### 1. In a list of 15 households, 9 own homes and 6 do not own homes....

##### 2. For the following experiment/question, pick the most appropriate statistical test. You have the following statistical...

##### Let X_1, and X_2 be independent binomial random variables with X_i having parameters (n_i, p_i), i...

##### A sociologist was interested in examining whether leftist regimes relates to per capita income to grow...

##### Fawns between 1 and 5 months old have a body weight that is approximately normally distributed...

##### Given ?0: ?1 = ?2, for which confidence interval should you reject ?0? A. (−2.001,−1.873) B....

##### Many food products contain small quantities of substances that would give an undesireable taste or smell...

##### 3: A statistics instructor believes that fewer than 20% of Evergreen Valley College students attended the...

##### A sample of 165 Lancaster University (LU) undergraduates who obtain their degree have a mean age...

##### Can you please explain how can we find the 50th percentile point using this grouped frequency...

##### A random sample of 100 students at a high school was asked whether they would ask...

##### Suppose that X is continuous random variable with PDF f(x) and CDF F(x). (a) Prove that...

##### A new soft drink is being market-tested. A random sample of 100 consumers tasted the new...

##### A pharmaceutical company conducted a survey in 2009 and found out that 10% of their employees...

##### Sports psychologists are interested in whether the pulses of long-distance runners differ from those of other...

##### If the correlation between two variables is close to 0, you can conclude that a scatterplot...

##### Let x be a random variable that represents the pH of arterial plasma (i.e., acidity of...

##### A researcher performed a study to validate a translated version of the Western Ontario and McMaster...

##### A police officer is concerned about speeds on a certain section of Interstate 95. The data...

##### Researchers are interested in the mean age of a certain population. A random sample of 100...

##### The marketing department must estimate the percent of the website's current viewers who prefer a new...

##### A political scientist is interested in the effect of government type on economic development. She wants...

##### The distribution of rhesus monkey tail lengths is bell-shaped, unimodal, and approximately symmetric. The average tail...

##### Is a one sample or two sample z test be used for testing Lumber prices being...

##### Pain before treatment Pain after treatment 9 8 5 6 6 4 4 3 3 3...

##### For the following data 10, 15, 30, 30, 31, 31, 32, 32, 33, 33, 34,...

##### 1. Assume that x has a normal distribution with the specified mean and standard deviation. Find...

##### A study was conducted on twins at age 5 years old. One twin was assigned to...

##### Let X be normally distributed with mean μ = 103 and standard deviation σ = 35....

##### Five males with a particular genetic disorder have one child each. The random variable x is...

##### 1. Given that x is a normal variable with mean μ = 112 and standard deviation...

##### A political candidate has asked his/her assistant to conduct a poll to determine the percentage of...

##### Allen's hummingbird (Selasphorus sasin) has been studied by zoologist Bill Alther.† Suppose a small group of...

##### A new thermostat has been engineered for the frozen food cases in large supermarkets. Both the...

##### Estimate the population mean by finding a 99.9% confidence interval given a sample of size 70,...

##### A bag contains 3 gold marbles, 8 silver marbles, and 20 black marbles. Someone offers to...

##### A food safety guideline is that the mercury in fish should be below 1 part per...

##### Determine the margin of error for a confidence interval to estimate the population mean with n...

##### A normal distribution has µ = 60 and sigma = 8. What is the probability of...

##### Why isn’t arithmetic appropriate for an ordinal scale?

##### Find the class boundaries of the first class.

##### The amount of snow falling in a certain mountain range is normally distributed with a mean...

##### Kimberly Clark Corporation’s Kleenex packages contain 60 tissues because their researchers determined that 60 tissues is...

##### In addition, answer the following question: In an experiment investigating the effect of sleep and eating...

##### A survey found that the average daily cost to rent a car in Los Angeles is...

##### Your professor claims that 50% of people in the United States attends church regularly. You think...

##### In a random sample of eight people the mean commute time to work was 35.5 minutes,...

##### If you are taking a random sample from a normal population with = 50 and = 6,...

##### The Central Limit Theorem says that when sample size n is taken from any population with...

##### A physical therapist have developed some new devices to aid in patient recovery. Individuals conducting a...

##### 2-5.5 - A common method for detecting a signal in a presence of noise is to...

##### a researcher wanted to know if type of adult attachment affected how well people cope with...

##### Schadek Silkscreen Printing, Inc., purchases plastic cups on which to print logos for sporting events, proms,...

##### Customers arrive at bank according to a Poisson process with rate 20 customers per hour. The...

##### A women’s figure salon specializes in weight reduction. A sample of six women were used to...

##### The Wilson family had 7 children. Assuming that the probability of a child being a girl...

##### Use the following information to answer the next 6 exercises. The sample space S consists of...

##### A fair coin is tossed two times, and the events A and B are defined as...

##### rythromycin is a drug that has been proposed to possibly lower the risk of premature delivery....

##### Completing regression modeling can require various steps in order to obtain the best results. The process...

##### If I take binomial distribution, like P % a population are graduates. Given a sample of...

##### A car manufacturer, Swanson, claims that the mean lifetime of one of its car engines is...

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