Stuart

Most popular questions and responses by Stuart
1. 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
2. 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 F-value for the degrees of freedom, d.f. = (7,3) is. A) 8.45 B) 27.67 C) 5.89 D) 14.62 9. One-way ANOVA is performed

asked on March 8, 2009
3. 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

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
5. 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
6. 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

) 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
8. 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
9. 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
10. 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

A chi-square test for independence with 8 degrees of freedom results in a test statistic of 18.21. Using the chi-square table, the most accurate statement that can be made about the p-value for this test is that: A) p-value < 0.01 B) 0.025 > p-value > 0.01

asked on March 15, 2009
12. 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
13. 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
14. 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
15. 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
16. Statistics

1) For each of the following statements, formulate appropriate null and alternative hypotheses. Indicate whether the appropriate test will be one-tailed or two-tailed,then sketch a diagram that shows the approximate location of the rejection regions for

asked on March 1, 2009
17. 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
18. 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
19. 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
20. 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
21. 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
22. physics

Explain why helicopters need 2 rotors to fly in a straight line.

asked on December 14, 2016
23. Physics

A bowling ball pendulum demonstration goes bad. The 8.0-lb 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
24. math

5 3/5 + 3/4 + 2 1/2 =

asked on April 30, 2012
25. Statistics Help

Six candidates for a new position of vice-president 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
26. 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
27. 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
28. 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
29. 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
30. 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 A-C and D-G respectively. Blood Alcohol Level of Victim Age A B C 0.00%

asked on February 15, 2009
31. 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
32. Physics

You drill a well to a depth of 100-m. Find the difference in water pressure, comparing the top and bottom of the well

asked on February 6, 2017
33. Math

I want to creat a easy-to-use 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
34. Math

12 - 9 = 15d + 9? please help with operations

asked on March 1, 2011
35. chemistry

How many moles of calcium carbonate can be disloved in .0250 moles of hydrocloric acis

asked on March 16, 2010
36. algebra topics

- 7/8 - 4/5 simplify

asked on February 15, 2010
37. 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
38. Statistics

Using the information presented calculate the following probabilities: Blood Alcohol Level of Victim A B C Age 0.00% 0.01-0.09% 0.10% D 0-19 142 7 6 155 E 20-39 47 8 41 96 F 40-59 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
39. physics

Explain why helicopters need 2 rotors to fly in a straight line. Talking about centripetal force.

asked on December 14, 2016
40. 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
41. 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

In a goodness-of-fit 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

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
44. 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
45. Math

12 - 9 = 15d + 9? please help with operations

asked on March 1, 2011
46. maths

multiply and simplify 2(b + 3) + 3(2b - 1)

asked on November 30, 2008
1. 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
2. quantum physics

its wrong.8 d,

posted on October 18, 2013
3. quantum physics

r u right,david abt 8d?and wat abt 8 b?

posted on October 18, 2013
4. quantum physics

r u right,david abt 8d?

posted on October 18, 2013
5. physics

sure last option?justify

posted on October 18, 2013
6. physics

It is the derivative if you know calculus.

posted on October 18, 2012
7. 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
8. Math

Please I need help with operations to this following problem: 12d - 9 = 15d + 9

posted on March 1, 2011