1,010 Answered Questions for the topic Statistics Question

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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Statistics Question

10/19/14

Please Help solve this problem in decription
The time it take Claudia to drive to work is normally distributed with a mean of 46 minutes and a standard deviation of 5 minutes. What percentage of the time will it take her less than 61 minutes... more
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Statistics Question Statistics Mode Standard Deviation

10/19/14

HELP!! std. dev, mode and mean.
There are 5 participants in a study. All I have are some statistics to find out the individual numbers for the 5 people. The mean is 8, the standard deviation is 4, the mode is 5 and the range is... more
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Statistics Question

10/19/14

Body Mass Index normally distributed 24, SD 2.5. What is 95% confidence interval of population?
95% Interval of poulation from sample   Suppose the Body Mass Index (BMI) in American adults is normally distributed. We randomly selected 180 adults and got that their average BMI is 24 kg/m2... more
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Statistics Question

10/17/14

Consider the following data set:
Consider the following data set:8 7 13 3 64 8 6 3 40 1 11 7 18 6 12 13 109 11 3 2 97 1 16 3 210 15 2 5 88 17 2 5 5(a) Calculate ¯x and s(b) Calculate the percentages of observations (numbers in the... more
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Statistics Question

10/15/14

Finding the standard deviation and mean
M = 30 and 47.5% is between 24 and 30. What is the standard deviation?  Also, if Q1 (quartile 1) is 45 and standard deviation is 3.5 when what is the mean?
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Statistics Question

10/12/14

Statistic Word Problem using Excel functions NORM. DIST and NORM.INV. Help!!!
Suppose that a random variable X follows a normal distribution with mean 81.0 and standard deviation 7.3. Find the following using NORM. DIST and NORM.INV: A) p(x<85.6) B) p(x greater than or... more
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Statistics Question Math Statistics Math Help

10/12/14

T SCORE and Effect size
A professor believes the students in a statistics class this term are more creative than most other students attending the university. A previous study found that students at the university had a... more
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Statistics Question Statistics

10/12/14

Statistics help please (mult)
An analysis of variance differs from a t test for independent means in that an analysis of variance A) can be used to compare three or more groups, while a t test for independent means cannot be... more
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Statistics Question

10/12/14

Statistics word problems
For their class project, a group of statistics students decide to survey the student body to assess opinions about the proposed new student center. Their sample of 200 contained 50 first-year... more
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Statistics Question

10/12/14

If the cutoff Z score on the comparison distribution is -1.64 and the sample Z score is 2.05 on the comparison distribution, the correct decision is to
If the cutoff Z score on the comparison distribution is -1.64 and the sample Z score is 2.05 on the comparison distribution, the correct decision is to A) fail to accept the research... more
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