945 Answered Questions for the topic Statistics Question

Statistics Question

12/02/14

I need the probability of a standard problem.
the mean of monthly rent is $2650. Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $2704?
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Statistics Question Normal Distribution

11/27/14

Need help.
The mean gas mileage for a hybrid car is 56 miles per gallon. Suppose that the gasoline mileage is approximately normally distributed with a standard deviation of 3.3 miles per gallon. (a) What... more
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Statistics Question

11/27/14

Need help.
The time required for an automotive center to complete an oil change service on an automobile approximately follows a normal distribution, with the mean of 17 minutes and a standard deviation of 2... more
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Statistics Question

11/26/14

Statistics Normal Distribution.
The average age of a passenger on the Euro rail passenger train is 29.4 years. If the distribution of ages isnormal and 20% of the passengers are older than 33.6 years old, find the standard... more
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Statistics Question

11/26/14

help me wit my statistics question
The weights of a set of boxes are normally distributed with mean 16g. and standard deviation 0.6g. If a box is selected at random, find the probability that its weight is more than 15.8g.
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Statistics Question

11/25/14

a exit poll surveyed 987 people anf found 654 of them have voted for drew kuomo. construct a90% confidence interval for the true proportion of voted for drew
a exit poll surveyed 987 people anf found 654 of them have voted for drew kuomo. construct a90% confidence interval for the true proportion of voted for drew Kuomo. Express your answer (x.x%,x.x%)
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Statistics Question

11/24/14

statistcs, correlation
The correlation between hours studied for Math class and Math grade for high school students is found to be about r = 0.75. Suppose we wish to use Math study hours x to predict Math grade y for... more
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Statistics Question

11/17/14

Statistics which t-test to use etc..
Q1 A liquid phase reaction: A → 2R was performed in two different reactors and the following results were obtained in repeated experiments: Reactor 1: Conversion of A (in %): 57.2, 53.1, 59.8,... more
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Statistics Question Statistics

11/13/14

Can they infer at the 5% significance level that sales increase during the campaign? What is the test statistic?
The general manager of a chain of fast food chicken restaurants wants to determine how effective their promotional campaigns are. In these campaigns "20% off" coupons are widely distributed. These... more
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Statistics Question

11/12/14

Statistical word problem
Suppose a mathematician computed the expected value of winnings for a person playing different games in a casino. What would you expect to be true for all expected values for these games?
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Statistics Question

11/11/14

Starting salaries of 64 college graduates who have taken a statistics course have a mean of $44,500 with a standard deviation of $6,800.
Find an 90% confidence interval for μ.
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Statistics Question

11/09/14

12 bolts are tested for hardness
I am completely lost on this question and on this section in general can you help me with this question??   When 12 bolts are tested for hardness, their indexes have a standard deviation of 41.7.... more
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Statistics Question

11/04/14

Statistics word problem
Suppose that this year the cubs and mariners make it to the world sires, and suppose the cubs, a stronger team, has a 55% chance to win any individual game. Also assume there are no ties. Use 6... more
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Statistics Question

10/31/14

What proportion of bond mutual funds are within one standard deviation of the mean? what proportion of stock mutual funds are within one standard deviation of t
Bond mutual funds          Stock mutual funds 3.2   3.4                        9.4          7.6 1.8   2.4                        9.1           7.4 1.9   2.7                           8.4        ... more
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Statistics Question

10/30/14

statistics excel
excel spreadsheet showing all calculations.A breakfast cereal manufacturer is concerned that their boxes of cereal are not being filled properly. According to the labels, each box should contain... more
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Statistics Question Statistics Five Number Summary

10/30/14

What is the five number summary of the following data set
35,28,43,32,37,35,31,25,40,36
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Statistics Question

10/28/14

Flight times between London and Hong Kong are normally distributed with
Flight times between London and Hong Kong are normally distributed with = 12:5 hours and standard deviation = 1:5 hours. (a) (10) Find the probability that a áight will take longer than 14 hours.... more
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Statistics Question

10/28/14

In a poll of 1000 likely voters
 600 say that the united states spends too little on fighting hunger at home. Find 90% confidence interval for the true proportion of voters who feel this way.
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Statistics Question

10/28/14

Find the 90% confidence interval for the variance and standard deviation of the ages of seniors at Oak Park College
 if a sample of 20 Students has a standard deviation of 2.3 years. Assume the variable is normally distributed. Please show me how you did it
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Statistics Question

10/28/14

A fair die is rolled 30 times. what is the expected number of sixes to turn up in 30 rolls? What is the probability of getting at least 7 sixes in 30 rolls?
This is a question that is on binomial distribution. I have the formula and I also know how to enter it into my ti83 but the answer comes up differently every time. 
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Statistics Question

10/27/14

If a card is drawn at random from a well shuffled deck, is getting a 3 independent of the suit? P(Three), P(Three/Heart)
Place fraction of outcome for... 1) P(Three)= 2) P(Three/ Heart)=
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Statistics Question

10/27/14

Multiple Linear Regression Question
The computer output shown below is part of the regression analysis to predict the height of the gold medal winning high jump in the Olympics based on year and gender.   Predictor        Coef    ... more
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Statistics Question

10/27/14

Multiple Linear Regression Question
The computer output shown below is part of the regression analysis to predict the height of the gold medal winning high jump in the Olympics based on year and gender.     Predictor          Coef... more
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Statistics Question

10/25/14

Which of the following is not true?
A. A z-score is an area under the normal curve B. A z-score is a conversion that standardizes any value from a normal distribution to a standard normal distribution. C. The area in any normal... more
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Statistics Question

10/22/14

find the average checking account that separates the bottom 45% from the top 55%?
Please help me! I really don't understand this question and I need to know it for my midterm tomorrow
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