1,029 Answered Questions for the topic Statistics Question

Statistics Question Probability

11/09/17

52% of voters voted for Barack Obama. If a sample of 100 voters were polled, would it be unusual if less than 40% of them had voted for Barack Obama
I've been trying to remember how to solve this but I can't find it in my notes please help
Follows • 2
Expert Answers •1
Statistics Question Statistics

11/08/17

a fashion designer wants to know how many new dresses women buy each year. Suppose a sample of 849 is drawn with x= 5.3. Assume standard deviation = 1.5.
construct 98% confidence interval. lower and upper bounderies needed
Follows • 2
Expert Answers •1
Statistics Question

11/07/17

For population, N = 11,000, mu =139, standard deviation = 15, find z value for x =128.60 for n= 64
mu = µ, standard dev = σ
Follows • 1
Expert Answers •1
Statistics Question Statistics Percentages

11/05/17

Statistics question.
I'm having a bit of trouble with this question. So I know that I need to find the z-score, but after that i'm not sure how to fer the exact percentage? I know the formulas for the z-score and... more
Follows • 2
Expert Answers •1
Statistics Question

11/05/17

statistics question
Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation 20. Find Upper P9, which is the IQ score separating the bottom 99% from the top 91%.
Follows • 1
Expert Answers •1
Statistics Question

11/05/17

PROBABILITY
A statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 54.0 minutes. Find the probability that a given class period runs... more
Follows • 2
Expert Answers •1
Statistics Question

11/04/17

Statistics 8.2
Identify the type I error and the type II error that corresponds to the given hypothesis.The proportion of settled medical malpractice suits is 0.32.   Which of the following is a type I... more
Follows • 1
Expert Answers •1
Statistics Question

11/02/17

50 students take an iq test, which has a mean of 100 and a standard deviation of 10. What would a student need to score to be in the top 95 percentile
minimum score in the top 5 percent  maximum score and still in bottom 25 percent
Follows • 1
Expert Answers •1
Statistics Question

10/29/17

Find the margin of error for the given confidence level and values of x and n. x=111,n=194, confidence level 99%
I have no clue on how to solve.  Please help
Follows • 2
Expert Answers •1
Statistics Question

10/24/17

What is the probability that the difference between a given sample mean and the population mean is less than 0.37?
Statistics- Central Limit Theorem 
Follows • 1
Expert Answers •1
Statistics Question Statistics

10/22/17

How to find a percentage with a normal distribution
The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. Eighty percent of the time, it takes more... more
Follows • 2
Expert Answers •1
Statistics Question

10/15/17

QUESTION IS IN THE DESCRIPTION (ENTER ANSWER AS WHOLE NUMBER)
Assume you have a room of 10 Facebook users and the average number of friends is 130. If one person in this room adds 50 new Facebook friends (none of whom are in the room), then what would be the... more
Follows • 2
Expert Answers •1
Statistics Question

10/15/17

The annual returns on one type of investment bond has a mean of 10.73% and a standard deviation of 6.12%.
The annual returns on one type of investment bond has a mean of 10.73% and a standard deviation of 6.12%. If the distribution is unimodal and symmetric with no outliers, what can we say about the... more
Follows • 1
Expert Answers •1
Statistics Question

10/15/17

It's statistics and probability related question.
a) A survey of park showed an average expenditure of Rs. 10.30. If for 20 girls the average expenditure was Rs.9.70 and Rs. 11.1 for the boys. Find the number of boys.b) A computer calculated a... more
Follows • 2
Expert Answers •1
Statistics Question

10/13/17

the average gpa is 4.0 with standard deviation of .2. What percent of admitted students had a gpa lower than 3.5
the average gpa is 4.0 with standard deviation of .2. What percent of admitted students had a gpa lower than 3.5
Follows • 2
Expert Answers •1
Statistics Question Statistics

10/11/17

Statistics question, please help asap?
The time to complete a standardized exam is approximately normal distributed with a mean of 100 minutes and a standard deviation of 15 minutes. The time, to the nearest minute, that should be given... more
Follows • 2
Expert Answers •1
Statistics Question Statistics

10/11/17

please help thanks!!
The results of an examination are found to be normally distributed with a standard deviation of 15.0. If a student is selected at random, the probability is 0.0485 that his mark will exceed 85. The... more
Follows • 2
Expert Answers •1
Statistics Question

10/10/17

the 95th percentile of a population with mean 235 and standard deviation 25
what is the the 95th percentile of a population with mean 235 and standard deviation 25
Follows • 1
Expert Answers •1
Statistics Question

10/09/17

probability
A student takes a ten-question true-false quiz, but did not study and randomly guesses each answer. Find the probability that the student passes the quiz with a grade of at least 40% of the... more
Follows • 2
Expert Answers •1
Statistics Question

10/08/17

mean of 38000 miles and a standard deviation of 2600 miles. If it guarantees that tires last at least 32540 ​miles, what % of tires will live up to guarantee?
PLEASE GIVE THE PERCENT OF THE Z-SCORE. ROUND TO TWO DECIMAL PLACES. 
Follows • 1
Expert Answers •1
Statistics Question

10/07/17

Mean of 24.3 pounds and standard deviation of 2.3. Find the percentage of​ 18-month-old girls who weigh more than 29.6 pounds.
Use normal distribution table.
Follows • 2
Expert Answers •1
Statistics Question

10/07/17

results of a certain medical test are normally distributed with a mean of 123 and standard deviation of 14. Find percentage of people with reading above 136.
Use standard normal table
Follows • 2
Expert Answers •1
Statistics Question

10/07/17

Mean is 120 and standard deviation of 15. Find percentage of people with readings between 114 and 126.
 Have to use z-score table.
Follows • 1
Expert Answers •1
Statistics Question Z Scores

10/07/17

Normally distributed with a mean of 587 and a standard deviation of 98. what percentage of scores are at least 600?
I need all work possible. 
Follows • 1
Expert Answers •1
Statistics Question

10/06/17

For the standard normal distribution, find the area within one standard deviation
of the mean that is, the area between μ − σ and μ + σ. Round to four decimal places
Follows • 2
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.