945 Answered Questions for the topic Statistics Question

Statistics Question

09/18/16

Suppose the weight of an American woman 20 years or older should be normally distributed with a mean of 131 pounds and a standard deviation of 12 pounds.
This is also part of the question about it just wouldn't let me fit the whole question in the box.    What is the probability that a woman has a weight of more than 160 pounds if this were true?
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Statistics Question Math Statistics Math Help

09/18/16

REALLY REALLY NEED URGENT HELP
Need help for thisA group of working adults was surveyed to find out how well they sleep on weekend nights. The pie chart below shows, correct to the nearest hour, the hours of sleep of these... more
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Statistics Question

09/16/16

s = 3.5 and mean = 28, what is the 2 s score spread?
My statistics question is:    1. s = 2.5 and mean = 7, what is the 1 s score spread?   2. s = 3.5 and mean = 28, what is the 2 s score spread?
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Statistics Question

09/08/16

Which of the following is correct?
a) Whenever interactions are found, there must be main effects b)Whenever main effects are found there must be at least one interaction  c)When both interactions and main effects are found, the... more
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Statistics Question

09/05/16

Struggling with Statistics
One sample has a mean of M=5 and a second sample has a mean of M=10. The two samples are combined into a single set of scores. a. What is the mean for the combined set if both of the original... more
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Statistics Question

09/05/16

Statistics Help
2. A sample of n=15 scores has a mean of M=6. One person with a score of X=22 is added to the sample. What is the value for the new sample mean?3. A population of N=15 scores has a mean of µ=8. One... more
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Statistics Question

08/29/16

Struggling with statistics problems. They were assigned but not yet explained.
Sketch a histogram showing the distribution of scores shown in the following table (This was assigned for my Statistics class, however, we skipped this portion in my Finite math... more
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Statistics Question

08/29/16

Struggling with statistics problems. They were assigned but not yet explained.
What information can you obtain about the scores in a regular frequency distribution table that is not available from a grouped table?
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Statistics Question

08/29/16

Struggling with statistics problems. They were assigned but not yet explained.
Find each value represented for the distribution of scores in the following table. a. n b. ∑X c. ∑X2   X     f 5     1 4     2 3     3 2     5 1     3
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Statistics Question Statistics

08/29/16

Struggling with statistics problems. They were assigned but not yet explained.
Construct a frequency distribution table for the following set of scores. Include columns for proportion and percentage in your tables.   Scores: 5 7 8 4 7 9 6 6 5 3             9 6 4 7 7 8 6 7 8 5 more
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Statistics Question

08/25/16

If the variance is 846, what is the standard deviation?
If the variance is 846, what is the standard deviation?
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Statistics Question Math Statistics Statistic

08/09/16

In general, increasing sample size (n) effects type I error (alpha) and type II error (beda) in which of the following ways
A. Alpha increases , beta decreases  B. Alpha increases , beta increases  C. Alpha decreases , beta decreases  D. Alpha decreases , beta increases 
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Statistics Question

08/06/16

.Assume that the number of new visitors to a website in one hour is distributed as a Poisson variable
Assume that the number of new visitors to a website in one hour is distributed as a Poisson variable  
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Statistics Question

08/06/16

how to use central limit theorom to find probaility
Use the Central Limit Theorem to find the indicated probability. The sample size is n, the population proportion is p, and the sample proportion is .n = 160, p = 0.29; P( > 0.3)
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Statistics Question

07/29/16

geometric distribution
A newspaper find that the mean number of typographical error's per page is six find the probability that at most five topographical errors are found on page
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Statistics Question

07/28/16

Benford's Law
It is a striking fact that the first digits of numbers in legitimate records often follow a distribution known as Benford's Law, shown below.First digit 1 2 3 4 5 6 7 8 9Proportion 0.289 0.156... more
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Statistics Question

07/28/16

Solving for a, b, c, d
The College Board finds that the distribution of students' SAT scores depends on the level of education their parents have. Children of parents who did not finish high school have SAT math scores X... more
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Statistics Question

07/27/16

what is the probability that a randomly selected month has photocopy cost higher than 590.00$?
a corporation calculates that the cost of photcopies follows a normal distrubution with a mean of 500$ per month and a standard deviation of $50 per month.
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Statistics Question

07/26/16

Statistics Confusion Please Explain
A state has a lottery game where a person picks one of the 1000? three-digit numbers between 000 and 999. The lottery selects a? three-digit number at random. With a bet of? $1, a person wins $500... more
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Statistics Question

07/22/16

Using the empirical rule, approximately what percent of the score are: less than 360?
The test scores on the quantitative portion of the Scholastic Aptitude Test (SAT) are normally distributed with a mean score of 570 and SD of 70. Using the empirical rule, approximately what... more
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Statistics Question

07/16/16

Construct the confidence interval for the mean number of words a third grader can read per minute.
An educational psychologist wishes to know the mean number of words a third grader can read per minute. She wants to make an estimate at the 80% level of confidence. For a sample of 448 third... more
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Statistics Question

07/09/16

What would you expect to see if you were calculating the sample STANDARD DEVIATION of sales from a convenient store
What units would you expect to see if you were calculating the sample STANDARD DEVIATION of sales from a convenient store? 
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Statistics Question

07/08/16

normal distribtuion
he amount of money that a student at harvard university carries on his/her person is normally distributed with a mean of $25 and a standard deviation of $5. What is the probability that a randomly... more
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Statistics Question

07/06/16

statistics
in a standard normal distribution find the area under the cure for z -scores less than -1.23 round to the 4 decimal places?
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Statistics Question Statistics

07/06/16

A bank manager decides to study waiting times of customers for teller service at the noon lunch hour (noon to 1pm). He selects one customer every 20 minutes to
A bank manager decides to study waiting times of customers for teller service at the noon lunch hour (noon to 1pm). He selects one customer every 20 minutes to measure the time the customer enters... more
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