A manufacturer of aspirin claims that the proportion of headache sufferers who get relief with just two aspirins is 62% What is the probability that in a random sample of 470 headache sufferers, less than 59.9% obtain relief?

Q: The coach of a running team thinks that 45% of athletes can run a mile in under 7 minutes. A simple…

A: Given problem Given that   The coach of a running team thinks that 45% of athletes can run a mile…

Q: the probability of success on each trial of an experiment is 0.4, what is the probability of 4…

A: n=6x= no. of successes=4p=0.4q=1-0.4=0.6p(X=x)=nCx*px*qn-x (binomial distribution)

Q: Based on historical data, your manager believes that 37% of the company's orders come from…

A:

Q: A courier service company wishes to estimate the proportion of people in various states that will…

A: number of samples, n = 330 true proportion, p = 0.05 Let, p^ be the sample proportion.  Hence p^…

Q: 45% of Americans don’t know the sun is a star. The data is normally distributed.Find the probability…

A: Given data, p=45%=0.45 n=120 P(p>0.42)=?

Q: One of the random samples of 6 people has a sample mean of 78 kg. Does this surprise you? Provide…

A: Given that Sample size (n)=6 Population mean =70 One of the random samples of 6 people has a sample…

Q: We know that certain bacteria are present in water in a proportion of 3 bacteria per cm3 . What is…

A: Given:. This means that on average, we expect to find 3 bacteria in each cubic centimeter of…

Q: It has been reported that 48% of people text and drive. A random sample of 60 drivers is drawn. Find…

A: The z-score is calculated by using: Where,

Q: Suppose a large consignment of cell phones contained 19% defectives. If a sample of size 399 is…

A: Given Population proportion is 19% sample size is 399

Q: e average incidence is 2 per million people. What is the probability that a city of 1 million people…

A: By using Poisson distribution:

Q: Find the probability for the sample proportion of men who experience sleep apnea to be le

A: Suppose that 20% of the population of men experience sleep apnea. A random sample of n = 64 men is…

Q: Suppose that 24% of US adults favor an increase in taxes.  What is the probability that in a group…

A: According to the given information, we have Sample size, n = 8 Given that 24% of US adults favor an…

Q: For a standardized psychology examination intended for psychology majors, the historical data show…

A:

Q: Based on historical data, your manager believes that 39% of the company's orders come from…

A:

Q: An experiemental drug has been shown to be 75% effective in eliminating symptoms of allergies in…

A: If X is a discrete random variable with probability mass function, p(x)=nCxpxqn-x; x=0,1,2......n…

Q: Based on historical data, your manager believes that 34% of the company's orders come from…

A: Here the given information is  Based on historical data, your manager believes that 34% of the…

Q: There is a 60% chance of getting stuck in traffic when leaving the city. On two separate days, what…

A:

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.