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pakinam:
Group Title
Last year, there were 30,000 students at a university; their GPA had a mean of 2.9 and an SD of 0.6. This year, in a simple random sample of…
 updated 11 months ago
 No Medals Yet
Mathematics

pakinam:
Group Title
Optogenetics is a new scientific method allowing:
Change of the genetic code in neurons
Simulating neuronal networks of 104 cells in the e…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

pakinam:
Group Title
The difference between μ and x¯ is
μ is a population parameter, x¯ is a sample parameter
Both are the mean, hence they are equal
…
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

pakinam:
Group Title
You simulate a lot of lognorma(5, 1) random variables and take their geometric mean. What will it likely be close to?
e^{5 + 1/2}
5 + 1/2…
 updated 10 months ago
 1 reply
 No Medals Yet
Mathematics

pakinam:
Group Title
You would like to estimate the prevalence of a disease. You randomly sample 10 people from the population of interest and 4 of them have the…
 updated one year ago
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Mathematics

pakinam:
Group Title
A diet pill is given to 9 subjects over six weeks. The average difference in weight (follow up  baseline) is 2 pounds. What would the stan…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
plz help:
Suppose that you create a 95% T confidence interval. You then create a 90% interval using the same data. What can be said about t…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
plz help:
Suppose that you create a 95% T confidence interval. You then create a 90% interval using the same data. What can be said about t…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
The durations of phone calls taken by the receptionist at an office are like draws made at random with replacement from a list that has an a…
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

pakinam:
Group Title
A truefalse test consists of 20 questions, each of which has one correct answer: true, or false. One point is awarded for every correct an…
 updated one year ago
 10 replies
 2 Medals
Mathematics

pakinam:
Group Title
A random variable X has the probability distribution
value 1 2 3 4
probability 0.5 …
 updated one year ago
 4 replies
 2 Medals
Mathematics

pakinam:
Group Title
A population consists of 25 men and 25 women. A simple random sample (draws at random without replacement) of 4 people is chosen. Find the c…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
A population consists of 25 men and 25 women. A simple random sample (draws at random without replacement) of 4 people is chosen. Find the c…
 updated one year ago
 2 replies
 No Medals Yet
Mathematics

pakinam:
Group Title
A population consists of 25 men and 25 women. A simple random sample (draws at random without replacement) of 4 people is chosen. Find the c…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
I roll a die repeatedly. Find the chance that the first 4 rolls all show different faces, and the 5th roll shows a face that has appeared be…
 updated one year ago
 1 reply
 1 Medal
Mathematics

pakinam:
Group Title
I roll a die repeatedly. Find the chance that the first 4 rolls all show different faces, and the 5th roll shows a face that has appeared be…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

pakinam:
Group Title
I throw darts repeatedly. Assume that on each single throw, my chance of hitting the bullseye is 10%, independently of all other throws. I d…
 updated one year ago
 13 replies
 2 Medals
Mathematics

pakinam:
Group Title
I throw darts repeatedly. Assume that on each single throw, my chance of hitting the bullseye is 10%, independently of all other throws. I d…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
On a truefalse test, each question has exactly one correct answer: true, or false. A student knows the correct answer to 70% of the questio…
 updated one year ago
 11 replies
 3 Medals
Mathematics

pakinam:
Group Title
According to genetic theory, every plant of a particular species has a 25% chance of being redflowering, independently of all other plants.…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

pakinam:
Group Title
A class has 3 Teaching Assistants (TAs). Each TA tosses a coin 10 times. Find the chance that at least one of the TAs gets exactly 5 heads.
 updated one year ago
 4 replies
 No Medals Yet
Mathematics

pakinam:
Group Title
400 draws are made at random with replacement from 5 tickets that are marked 2, 1, 0, 1, and 2 respectively. Find the expected value of:
…
 updated one year ago
 No Medals Yet
Mathematics

pakinam:
Group Title
in a roll of a die, let a "six" be the face with six spots. Consider the two events below.
Event A: more than 16,000 sixes in 100,000 rol…
 updated one year ago
 1 reply
 No Medals Yet
Mathematics

pakinam:
Group Title
A random number generator draws at random with replacement from the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. Find the chance that the digit 5 ap…
 updated one year ago
 3 replies
 3 Medals
Mathematics

pakinam:
Group Title
I toss a coin 4 times. Find the chance of getting 2 heads
 updated one year ago
 2 replies
 2 Medals
Mathematics

pakinam:
Group Title
A school is running a raffle. There are 100 tickets, of which 3 are winners. You can assume that tickets are sold by drawing at random witho…
 updated one year ago
 1 reply
 1 Medal
Mathematics

pakinam:
Group Title
In an egg carton there are 12 eggs, of which 9 are hardboiled and 3 are raw. Six of the eggs are chosen at random to take to a picnic (yes,…
 updated one year ago
 2 replies
 4 Medals
Mathematics

pakinam:
Group Title
In a population of 500 voters, 40% belong to Party X. A simple random sample of 60 voters is taken. What is the chance that a majority (more…
 updated one year ago
 17 replies
 1 Medal
Mathematics

pakinam:
Group Title
A poker hand consists of 5 cards dealt at random without replacement from a standard deck of 52 cards of which 26 are red and the rest black…
 updated one year ago
 12 replies
 4 Medals
Mathematics