8,958 Answered Questions for the topic statistics

Statistics

10/31/22

Sample Proportion Question
According to a 2009 Reader's Digest article, people throw away about 7% of what they buy at the grocery store. Assume this is the true proportion and you plan to randomly survey 100 grocery... more
Follows • 1
Expert Answers •1
Statistics

10/31/22

Introduction to Stats
If n=16, ¯x (x-bar)=37, and s=15, construct a confidence interval at a 98% confidence level. Assume the data came from a normally distributed population.Give your answers to one decimal... more
Follows • 1
Expert Answers •1
Statistics

10/30/22

Statistics question
Adult male height is normally distributed with a mean of 69 inches and a standard deviation of 2.29 inches. If an adult male is randomly selected, what is the probability that the adult male has a... more
Follows • 1
Expert Answers •1
Statistics

10/27/22

What is the probability that a randomly selected day from 2013 will have a Group Trades total within 57,000 of the mean?
the mean is 3421439 and the standard deviation is 508638.08
Follows • 1
Expert Answers •1
Statistics

10/27/22

 If you choose 100 vehicles at random, what is the probability that 61 or more carry just one person?
Although cities encourage carpooling to reduce traffic congestion, many vehicles carry only one person. For example, 70% of vehicles on the roads in the Minneapolis-St. Paul metropolitan area are... more
Follows • 1
Expert Answers •1
Statistics

10/27/22

The district uses a standardized reading test to assess a student’s reading level and that scores on this test are normally distributed with a mean of 250 and a standard deviation of 20. 
A public school district has been given federal development funds to establish remedial reading classes for the students in grades 1 through 3. The district uses a standardized reading test to... more
Follows • 1
Expert Answers •1
Statistics

10/27/22

In description box
Suppose that the heights of adult women in the United States are normally distributed with a mean of 63.5 inches and a standard deviation of 2.3 inches. Maria is taller than 90% of the population... more
Follows • 1
Expert Answers •1
Statistics

10/27/22

For a standard normal distribution, find c if P(z > c) = 0.3732
Follows • 1
Expert Answers •1
Statistics Math Calculus

10/26/22

Statistic Question (Homework Help)
Subject 1 2 3 4 5 6 7 8 9 ​Normal, Xi 4.49 4.34 4.58 4.65 4.31 4.83 4.59 5.00 4.79 ​Impaired, Yi 5.77 5.67 5.45 5.29 5.90 5.49 5.23 5.61 5.63 To illustrate the effects of driving under... more
Follows • 1
Expert Answers •1
Statistics

10/26/22

When two dices are rolled at once, what would be the sum greater than or equal to 4?

Follows • 1
Expert Answers •1
Statistics Probability

10/26/22

What is the probability that the first marble is red and the second is green?

There is a bag of marbles. Inside the bag there are 10 blue marbles, 6 red marbles and 5 green marbles. Two marbles are selected from the bag without replacement. What is the probability that the... more
Follows • 1
Expert Answers •1
Statistics

10/26/22

If n=17, ¯ x x ¯ (x-bar)=32, and s=3, find the margin of error at a 98% confidence level
Follows • 1
Expert Answers •1
Statistics Math

10/25/22

Calculate the shaded area under the curve
The shelf life of a batteries produced by one major company are normally distributed with a mean of 4.9 years and a standard deviation of 1 years. The figure below shows the distribution of shelf... more
Follows • 1
Expert Answers •1
Statistics

10/25/22

pleaseeeeeeeeeeeeeeeeeeeee
We wish to estimate what percent of adult residents in a certain county are parents. Out of 400 adult residents sampled, 288 had kids. Based on this, construct a 99% confidence interval for the... more
Follows • 1
Expert Answers •1
Statistics

10/24/22

why is alternative hypothesis said to be “supported” but not said to be “proven”?

Is it because of the statistical procedure to prove statement or is it the bid involved in supporting certain confidence? Thanks
Follows • 1
Expert Answers •1
Statistics

10/24/22

Probability lung cancer (statistics)
Approximately 1 percent of Americans ages 50-60 have lung cancer. A patient with lung cancer has a 87 percent chance of a positive test. A patient without lung cancer has a 9 percent chance of a... more
Follows • 1
Expert Answers •1
Statistics

10/24/22

Polling organization probability 
A polling organization randomly selects an adult American for a survey about credit card usage. Suppose 47% of the population is male. Suppose 9.8% of males smoke cigars and 1.04% of females smoke... more
Follows • 1
Expert Answers •1
Statistics Math Probability

10/23/22

Given a situation that x can be any number between 4 and 30 that is divisible by 3, what value of x can be added to the data set 4, 8, 10, 20, and 30 to get a mean of 15? explai
Follows • 1
Expert Answers •1
Statistics

10/23/22

Distribution of sample means
For a normal population with a mean of 100 and a standard deviation of 20, for a sample of n=25, what is the probability that the sample mean will be within 5 points of the population mean?
Follows • 1
Expert Answers •1
Statistics Econometrics

10/22/22

Econometrics Question
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
Follows • 1
Expert Answers •1
Statistics Math Econometrics

10/22/22

Econometrics help
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
Follows • 1
Expert Answers •1
Statistics Econometrics

10/22/22

Econometrics Problem
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
Follows • 1
Expert Answers •1
Statistics Econometrics

10/22/22

Econometrics Word Problem, see description
Suppose that you work for a company that produces and sells bicycle helmets. Your boss has asked you to determine the own-price elasticity of demand for helmets. That is, you’ve been asked to... more
Follows • 1
Expert Answers •1
Statistics Econometrics

10/22/22

Econometrics Question, see description (was too long)
Determine the sign of the expected bias introduced by omitting a relevant variable. State your assumptions and provide a very brief rationale for your assumptions.We plan to estimate the following... more
Follows • 1
Expert Answers •1
Statistics

10/22/22

If n=600 and p' (p-prime) = 0.82, construct a 95% confidence interval.
If n=600 and p' (p-prime) = 0.82, construct a 95% confidence interval.Give your answers to three decimals. < p < 
Follows • 1
Expert Answers •1

Still looking for help? Get the right answer, fast.

Ask a question for free

Get a free answer to a quick problem.
Most questions answered within 4 hours.

OR

Find an Online Tutor Now

Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.