2,628 Questions for the topic statistics

15h

Help with question
The mean incubation time of fertilized eggs is 2121 days. Suppose the incubation times are approximately normally distributed with a standard deviation of 11 day. Determine the incubation times... more
Follows • 2
Expert Answers •1
28f64a2b b5fe 4303 9e72 b0d980d98d9d

22h

statistics question

The ability of lizards to recognize their predators can often mean life or death for lizards. By flicking their tongues, lizards can help determine if a predator is close by. Seventeen juvenile... more
Follows • 1
Expert Answers •1
B8bfaf2b f63a 49c2 8438 0dd725aa95eb

22h

statistics question

College officials want to estimate the percentage of students who carry a gun, knife, or other such weapon. A % confidence interval is desired where the interval is no wider than 7 percentage... more
Follows • 1
Expert Answers •0

1d

How to determine SSE and SST when you just know SSR, R^2, N, standard deviation, and # of indepen. variables
I'm so lost, and need a response quick. I'll be eternally grateful to anyone who can answer this.We were given n=16, R2=.42, indepen var = 3, s=14.28, and found SSR based on this info already.What... more
Follows • 1
Expert Answers •0

1d

Suppose P(E)=0.35 and P(F)=0.4 and E and F are mutually exclusive. Which of the following is correct? (Hint: Use a diagram)
A) P(Ebar AND Fbar)=0.25, P(Ebar or Fbar)=0.75B) P(Ebar AND Fbar)=0.25, P(Ebar or Fbar)=1C) P(Ebar AND Fbar)=0.35, P(Ebar or Fbar)=0.75D) P(Ebar AND Fbar)=0.35, P(Ebar or Fbar)=1E) Not enough... more
Follows • 1
Expert Answers •0

1d

statistics question

A study was conducted on the gross earnings of concerts in Northeastern U.S. where more than 4,000 people were in attendance. Twenty-eight of these concerts were randomly selected. From this sample... more
Follows • 1
Expert Answers •1
28f64a2b b5fe 4303 9e72 b0d980d98d9d

1d

statistics question

The standard IQ test is designed so that the mean is 100 and the standard deviation is 15 for the population of all adults. We wish to find the sample size necessary to estimate the mean IQ score... more
Follows • 1
Expert Answers •1
28f64a2b b5fe 4303 9e72 b0d980d98d9d

2d

Using the 68, 95, and 99.7 empirical rule. What is the probability that a outcome will be between the mean and one standard deviation above the mean?
Follows • 1
Expert Answers •1
830cdfee aacf 4c3f b9cd a5cbce16634b

2d

Statistics please
The lifetime of a certain brand of electric light bulb is known to have a standard deviation of hours. Suppose that a random sample of bulbs of this brand has a mean lifetime of hours. Find a ... more
Follows • 1
Expert Answers •0

2d

AP Statistics Class
Leon wants to estimate the proportion of the seniors at his high school who like to watch football. He interviews a simple random sample of 50 of the 200 seniors on campus. He finds that 32 like to... more
Follows • 1
Expert Answers •1
B8bfaf2b f63a 49c2 8438 0dd725aa95eb

2d

Statistics- Distribution of the Sample Proportion
The National Association of Realtors estimates that 23% of all homes purchased in 2004 were considered investment properties. If a sample of 800 homes sold in 2004 is obtained what is the... more
Follows • 1
Expert Answers •0

2d

Easy GRE question: Statistics?
I'm not sure how to set this statistics problem when they give me a group of arbitrary values. Can someone help? A group of 20 values has a mean of 85 and a median of 80. A different group of 30... more
Follows • 1
Expert Answers •0

2d

Cholesterol levels are measured on a random sample of 1k people. A second survey was repeated in the same population, but the sample size tripled to 4k. What happens to the standard deviation?
Follows • 1
Expert Answers •1
B8bfaf2b f63a 49c2 8438 0dd725aa95eb

2d

GRE Probability and Statistics 2?
John invites 12 friends to a dinner party, half of which are men. Exactly one man and one woman are bringing desserts. If one person from this group is selected at random, what is the probability... more
Follows • 1
Expert Answers •0

3d

You’re working with populations and samples (a subset of a population) in business statistics.
What are three common types of measures to describe the data set?
Follows • 1
Expert Answers •0

3d

GRE problem combination
Find the number of ways in which 8064 can be resolved as the product of two factors? This answer is right or wrong, can anyone explain this. 8064=27*32*7 number of factors... more
Follows • 1
Expert Answers •1
8850b6cd e12c 4532 90c8 8137a505b3c4

3d

Transformation of random variables and second order stochastic dominance?
Suppose X and Y are two random variables where X SOSD Y. Let g(•) be a monotonic function and X'=g(X) and Y'=g(Y).Under what conditions of g, X' SOSD Y'? I know if g is linear SOSD property is... more
Follows • 1
Expert Answers •0

3d

Is a continuous random variable important?
Follows • 1
Expert Answers •0

3d

A summary measure calculated from population is called what?
Follows • 1
Expert Answers •0

3d

How much money does a market analyst earn?

Follows • 1
Expert Answers •0

3d

What are the two areas of statistics?
Follows • 1
Expert Answers •1
E3cd66e6 5a6b 4224 8472 61441101bc7d

3d

STATS question help
Dirt bikes are simpler and lighter motorcycles that are designed for off-road events. Specifications for dirt bikes can be found through Motorcycle USA on their website www.motorcycle-usa.com. A... more
Follows • 1
Expert Answers •0

3d

Which experimental design is this? Factorial vs within groups?
I have two independent variables (age and gender) and one dependent variable (the results of a questionnaire using a Likert scale). I'm trying to see whether age and/or gender have an effect on the... more
Follows • 1
Expert Answers •0

3d

Sxx in linear regression?
What is the meaning of 'Sxx' and 'Sxy' in simple linear regression? I know the formula but what is the meaning of those formulas?
Follows • 1
Expert Answers •0

3d

What's the difference between a statistic and Statistics?
Follows • 1
Expert Answers •0
1 3 4 5 6 7 … 106

Still have a question? Ask your own and get expert help!