275 Answered Questions for the topic Stats

Stats

09/21/15

Weight of men at a local health club? (Stats)
The population of weights for men attending a local health club is normally distributed with a mean of 166-lbs and a standard deviation of 27-lbs. An elevator in the health club is limited to 34... more
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Stats

06/28/15

This is for my stats class
A wildlife biologist observes four brown bears as they attempt to catch salmon in a river in Alaska. Assume that each bear has a .7 probability of catching a fish and that the bears fishing... more
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06/28/15

A poll taken before a recent election indicates that Candidate A leads Candidate B by a 52% to 48% margin. Tom agreed to pay Emma $2 if Candidate B wins.
How much should Emma agree to pay Tom if Candidate A wins in order to make the game fair? And how would you go about finding the answer?
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Stats

06/26/15

choose an alpha level of .01 and then analyze the data
choose an alpha level of .01 and then analyze the data
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Stats

06/23/15

.stats probability
. The ages of workers in the Illuminex plant are approximately normally distributed with a mean of 48 years and a standard deviation of 7 years. A worker is stopped at random and asked to fill out... more
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06/20/15

Probability Help!
1. Use the frequency distribution to find the expected value (mean), variance, and the standard deviation. Number of downloads (X) 27 28 30 31 32 Probability (P(X)) 0.15 0.2 0.3 0.25 0.1   2. You... more
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06/20/15

Probability!! 2
Thanks!   2. You have $10,000 to invest. After some investigating, you found two investment opportunities. Bond A has a return of 6.5% with a default rate of 2%. Bond B has a return of 8% with a... more
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06/15/15

Probability!!
1. At a raffle, 3000 tickets were sold at $5 a piece for four different prices of $1500, $1000, $500, and $100. Build a probability distribution table with all assigned probabilities. Calculate the... more
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Stats

06/04/15

stats help
Kellogg’s marketing department conducts an experiment to find out whether consumers can distinguish between its various brands of breakfast cereal. Five very small bowls of different brands of... more
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Stats

05/28/15

A bank officer wants to determine the amount of the average total monthly deposits per customer at the bank.
He believes an estimate of this average amount using a confidence interval is sufficient. He assumes the standard deviation of total monthly deposits for all customers is about $1,475. How large a... more
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Stats Pysch Stats

05/04/15

with 20 subjects in a group and three groups, what f-ratio defines the 0.05 alpha level and what f-ratio defines the 0.01 alpha level
this is for statistics analysis of variance, chi-square, correlatio  
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Stats

04/29/15

p-value what is the p value of z
You are conducting a study to see if the proportion of women over 40 who regularly have mammograms is significantly different from 0.39. Your sample data produce the test statistic z=2.37. Find the... more
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Stats

04/29/15

stats a manaufactur
A manufacturer knows that their items have a normally distributed length, with a mean of 18.2 inches, and standard deviation of 3.3 inches.If one item is chosen at random, what is the probability... more
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Stats

04/27/15

How do I find the probability of one person''s blood pressure will be greater than 120. There is a mean of 118 and a standard deviation of 9
There is a standard deviation of 9 and a mean of 118
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Stats

04/23/15

According to a survey conducted by the Association for Dressings and Sauces, 30% of American adults eat salad once each week. A nutritionist suspects that this
According to a survey conducted by the Association for Dressings and Sauces, 30% of American adults eat salad once each week. A nutritionist suspects that this percentage is not accurate. She... more
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Stats

04/13/15

If n=540 and pˆ (p-hat) = 0.63, construct a 95% confidence interval. Give your answers to three decimals
If n=540 and pˆ (p-hat) = 0.63, construct a 95% confidence interval.Give your answers to three decimals
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03/31/15

Compute the Mean & Standard Deviation from percentile values of a distribution
I have been given values for 10%, 50% and 90% of a distribution. From these numbers, how can I compute the mean and standard deviation?   I'll give an example....Temperature distribution 10th... more
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Stats

03/27/15

A Z-score for a test value of 70% is 0, and a Z-score of 1.0 corresponds to a test score of 74%. Match the remaining Z-scores with the standard deviations.
I need to know the standard deviation 
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Stats

03/25/15

pollsters are
Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 93 people in the 18-21 age bracket and finds that 79 of them respond and 14... more
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Stats

03/25/15

Suppose a jar contains 11 red marbles and 37 blue marbles. If you reach in the jar and pull out 2 marbles at random, find the probability that both are red.
Suppose a jar contains 11 red marbles and 37 blue marbles. If you reach in the jar and pull out 2 marbles at random, find the probability that both are red.
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Stats

03/25/15

hat the number rolled is a "1" OR a "2"?
Suppose you roll a special 35-sided die, where the sides are labeled 1 through 35. What is the probability that the number rolled is a "1" OR a "2"?
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02/21/15

Three complicated statistics (Normal Distribution) questions
1) The lengths in minutes of feature films for the current year follow a normal distribution with a mean of 109 minutes and a standard deviation of 12 minutes. What percentage of feature films in... more
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02/21/15

Stats word probability problem
If possible, please assist me with the formula and finding the answer please!   In a simple game, a six-sided die is rolled 4 times. If all four rolls result in either 1 or 2, then the player... more
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Stats

12/11/14

Normal Curve
When one thinks of the normal distribution the first thing that comes to mind is the bell curve and grades. While this is one example of a normal curve that is widely recognized, it is not the only... more
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12/08/14

Weights of a certain model of fully loaded gravel trucks follow a normal distribution with mean µ=6.4 tons and standard deviation s=0.3 ton.
Weights of a certain model of fully loaded gravel trucks follow a normal distribution with mean μ=6.4 tons and standard deviation σ=0.3 ton. What is the probability that a fully loaded truck of... more
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