Stuart
Most popular questions and responses by Stuart
Statistics
In 2020, the average charge of tax preparation was $95. Assuming a normal distribution and a standard deviation of $10, use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions. What proportion of
asked on February 22, 2009 
Statistics
Need help with these questions: I have already answered 27 out of the 30 accept these last three: 8. Given the significance level 0.01, the Fvalue for the degrees of freedom, d.f. = (7,3) is. A) 8.45 B) 27.67 C) 5.89 D) 14.62 9. Oneway ANOVA is performed
asked on March 8, 2009 
algebra
the average height of 3 boys and 2 irls is 1.65m. the height of another girl is 1.35m. what is the average height of the 3 boys and 3 girls?
asked on November 20, 2017 
Business Statistics
Given the least squares regression line = 2.88 + 1.77x, and a coefficient of determination of 0.81, the coefficient of correlation is: A) 0.88 B) +0.88 C) +0.90 D) –0.90 I picked C +0.90
asked on March 15, 2009 
Statistics Help
A medical statistician wanted to examine the relationship between the amount of sunshine (x) and incidence of skin cancer (y). As an experiment, he found the number of skin cancers detected per 100,000 of population and the average daily sunshine in eight
asked on March 29, 2009 
Statistics I think I have the answer
The salaries (in thousands of dollars) for a sample of 13 employees of a firm are: 26.5, 23.5, 29.7, 24.8, 21.1, 24.3, 20.4, 22.7, 27.2, 23.7, 24.1, 24.8, and 28.2. Compute the variance of the salaries. a)2.562 b)6.125  I Picked this c)9.223 d)7.097
asked on March 29, 2009 
Business Statistics
) A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 11 27 21 17 14 Find the value of coefficient of correlation, r. a)  0.991 b) 0.872 c)  0.512 d) 0.942 2) In the past, young women drivers have maintained a
asked on March 29, 2009 
physics
Three cubic meters of liquid nitrogen has a mass about 2700 kg. When this much liquid nitrogen evaporates into gaseous air of density 1.25 kg/m3, what will its volume be? Show your work
asked on February 6, 2017 
Math
Teresa has 4 flower pots in 4 different designs she likes to display her flower pots in different position on her window sill how many ways can she place her flower pots?
asked on November 6, 2012 
Statistics
A monthly report to the Texas Department of Health, division of Water Hygiene, contained the following water production data in thousands of gallons: 5263 5636 5264 4395 6090 5293 4668 5725 5171 4378 5118 5538 4838 5167 5119 5438 6843 5262 4653 5303 5913
asked on March 29, 2009 
Business Statistics
A chisquare test for independence with 8 degrees of freedom results in a test statistic of 18.21. Using the chisquare table, the most accurate statement that can be made about the pvalue for this test is that: A) pvalue < 0.01 B) 0.025 > pvalue > 0.01
asked on March 15, 2009 
Statistics
1) Laura McCarthy, the owner of Riverside Bakery, has been approached by insurance underwriters trying to convince her to purchase flood insurance. According to local meterologist, there is a 0.01 probability that the river will flood next year.
asked on February 16, 2009 
Engineering
I need help solving the following simultaneous equations, for the values of Vo and a: 1.4 = Vo e^32a 4 = Vo e^6a I've never come across simultaneous equations like this (e is the base of natural logarithms, so perhaps taking logs of both sides might
asked on May 13, 2007 
chemistry
When you consume a lot of food that is basic, how does your stomach respond to it? Why is this response necessary? Do you want to neutralize ALL the acid in your stomach? Why or Why not (Hint: What is the stomach acid for?) Describe and explain two
asked on March 31, 2010 
Statistics
When no point lies outside the control limits of a chart, we conclude that: A) variation in the process is caused by assignable causes and there is enough evidence to infer that the process is in statistical control. B) variation in the process is caused
asked on March 22, 2009 
Statistics
1) For each of the following statements, formulate appropriate null and alternative hypotheses. Indicate whether the appropriate test will be onetailed or twotailed,then sketch a diagram that shows the approximate location of the rejection regions for
asked on March 1, 2009 
Statistics
Intentions of consumers regarding future automobile purchases and the financial capability of the consumers are given below: What is the provability of P(A  D)? a)0.5 b)0.75 c)1 d)0
asked on March 29, 2009 
Statistics Help Please
A sample of eight observations of variables x and y is shown below: x 5 3 7 9 2 4 6 8 y 20 23 15 11 27 21 17 14 Find the value of coefficient of correlation, r. a)  0.991 b)0.872 c) 0.512 d)0.942
asked on March 29, 2009 
Statistics
A multiple regression model has the form: As x2 increases by 1 unit, holding constant x1, then the value of y will increase by: ^ is over y = 5.25 + 2.5x1 + 4x^2 A) 2.5 units B) 7.75 unit C) 4 units on average D) 11.75 units on average
asked on March 22, 2009 
Statistics
A test for independence is applied to a contingency table with 3 rows and 5 columns for two nominal variables. The degrees of freedom for this test will be: A) 20 B) 12 C) 8 D) 15
asked on March 15, 2009 
Statistics
Using the below information calculate the conditional probability of C given each of the age groups, or P(C/D), P (C/E), etc. Compare these probabilities and speculate as to which age groups seem more likely than others to have been (according to the legal
asked on February 15, 2009 
physics
Explain why helicopters need 2 rotors to fly in a straight line.
asked on December 14, 2016 
Physics
A bowling ball pendulum demonstration goes bad. The 8.0lb bowling ball is raised to the height of the demonstrators nose, 160 cm above the ground, and releases the bowling ball. When the bowling ball is at the lowest point of the swing (36 inches above
asked on November 13, 2016 
math
5 3/5 + 3/4 + 2 1/2 =
asked on April 30, 2012 
Statistics Help
Six candidates for a new position of vicepresident for academic affairs have been selected. Three of the candidates are female. The candidates’ years of experience are as follows. Candidate Experience Female 1 Female 2 Female 3 Male 1 Male 2 Male 3 5 9
asked on March 29, 2009 
Statistics
Much of the emphasis in TQM is an understanding and reducing variation within the process through which the product is produced, and samples of output are used in reaching inferences about the stability of the process. I choose True. True False
asked on March 22, 2009 
Statistics
If a point is more than 3 sigmas away from the centerline, or if two out of three consecutive points are on the same side of the centerline and more than 2 sigmas away from it, the process is deemed to be in control. True False
asked on March 22, 2009 
Statistics
When the purpose of sampling is to detect when a process becomes too variable, the chart of choice will be an R chart. True False I picked True.
asked on March 22, 2009 
Statistics
Assume x is normally distributed with mean µ= 15 and standard deviation α= 3. Use the approximate areas beneath the normal curve, as discussed in this section, to answer the following questions. Find P (X ≥15) A) 0.50 B) 0.16 C) 0.34 D) 0.84
asked on February 22, 2009 
statistics
The following contingency table of frequencies is based on a five year study of fire fatalities in Maryland. For purposes of clarity, columns and rows are identified by the letters AC and DG respectively. Blood Alcohol Level of Victim Age A B C 0.00%
asked on February 15, 2009 
Genral Science
What C word defines a substance that speeds a chemical reaction without being consumed? http://en.wikipedia.org/wiki/Catalysis
asked on March 28, 2007 
Physics
You drill a well to a depth of 100m. Find the difference in water pressure, comparing the top and bottom of the well
asked on February 6, 2017 
Math
I want to creat a easytouse formula to measure the intensity of a exercise workout. The input factors are: 1. Minutes exercise. 2. Miles run. 3. Calories burned. 4. Level of treadmill. So, if: Minutes = 50 Miles = 4 Calories = 423 Level = 10 Therefore,
asked on April 21, 2012 
Math
12  9 = 15d + 9? please help with operations
asked on March 1, 2011 
chemistry
How many moles of calcium carbonate can be disloved in .0250 moles of hydrocloric acis
asked on March 16, 2010 
algebra topics
 7/8  4/5 simplify
asked on February 15, 2010 
Statistics
Much of the emphasis in TQM is an understanding and reducing variation within the process through which the product is produced, and samples of output are used in reaching inferences about the stability of the process. I choose True. True False
asked on March 22, 2009 
Statistics
Using the information presented calculate the following probabilities: Blood Alcohol Level of Victim A B C Age 0.00% 0.010.09% 0.10% D 019 142 7 6 155 E 2039 47 8 41 96 F 4059 29 8 77 114 G 60 over 47 7 35 89 Total 265 30 159 454 A) P(A or D) B) P(B or
asked on February 15, 2009 
physics
Explain why helicopters need 2 rotors to fly in a straight line. Talking about centripetal force.
asked on December 14, 2016 
Science
These are 3 of the 21 questions i have and they seem pretty difficult. Someone help me please :). When you consume a lot of food that is basic, how does your stomach respond to it? Why is this response necessary? Do you want to neutralize ALL the acid in
asked on March 31, 2010 
Statisitics
When the purpose of sampling is to detect when a process becomes too variable, the chart of choice will be an R chart. I picked true on this? True False
asked on March 22, 2009 
Business Statistics
In a goodnessoffit test, the null hypothesis states that the data came from a normally distributed population. The researcher estimated the population mean and population standard deviation from a sample of 500 observations. In addition, the researcher
asked on March 15, 2009 
Business Statistics
If the total variation in y values is 200, and the variation explained by regression line is 180, then the coefficient of determination is equal to __________. A) 1.11 B) 0.90 C) 0.81 D) 1.21 I picked D 1.21
asked on March 15, 2009 
Math
If a car is going 50 mph and is hit by a car going 70 mph, how fast (what mph) does the car going 50 mph hit the wall
asked on November 5, 2012 
Math
12  9 = 15d + 9? please help with operations
asked on March 1, 2011 
maths
multiply and simplify 2(b + 3) + 3(2b  1)
asked on November 30, 2008

math algebra?
If I spend 2/3 on a car then 2/3 on a boat and have£2000 left what did I start with
posted on June 8, 2014 
quantum physics
its wrong.8 d,
posted on October 18, 2013 
quantum physics
r u right,david abt 8d?and wat abt 8 b?
posted on October 18, 2013 
quantum physics
r u right,david abt 8d?
posted on October 18, 2013 
physics
sure last option?justify
posted on October 18, 2013 
physics
It is the derivative if you know calculus.
posted on October 18, 2012 
8th grade science
Velocity is displacement divided by time, its a vector having both magnitude and direction Speed is distance divided by time and is scalar having a magnitude only. ie. a man runs a race stopping at the finish line, hence 0 displacement and no velocity. He
posted on April 13, 2011 
Math
Please I need help with operations to this following problem: 12d  9 = 15d + 9
posted on March 1, 2011 
Business Statistics
Thanks again MathGuru
posted on March 15, 2009 
Statistics
Thank you MathGuru
posted on March 15, 2009