# stats math

Popular wisdom is that eating pre-sweetened cereal tends to increase the
number of dental caries (cavities) in children. A sample of children was
(with parental consent) entered into a study and followed for several years.
Each child was classified as a sweetened-cereal lover or a non-sweetened
cereal lover. At the end of the study, the amount of tooth damage was
measured. Here is the summary data:
Group n mean std. dev
Sugar Bombed 10 6.41 5.0
No sugar 15 5.20 15.0
An approximate 95% confidence interval for the difference in the mean
tooth damage is:
ANS.

Degrees of Freedom
v=18.26

(6.41 − 5.20) ± 2.26(Sqrt.(25/10 + 225/15

i want to know where and how the 2.26 came from. I see this from the 2-tail .05 and df=9.

1. 👍 0
2. 👎 0
3. 👁 618
1. (6.41 − 5.20) ± 2.26(Sqrt.(25/10 + 225/15))

1. 👍 0
2. 👎 0
2. For 95% confidence interval, t with 9 df = ± 2.26.

Look on table for t probabilities.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Basic Statistics

In the popular TV cartoon series, "The Simpsons," the Simpson family has five members: Homer, Marge, Bart, Lisa, and Maggie. Let's involve the Simpsons in Simpson's Paradox. Consider Homer and Bart's consumption of potato chips

asked by Claire corquette on August 6, 2011
2. ### health

6. ________ is an effective classroom management strategy to help prevent dental cavities. (1 point) Flossing at least once per week Teaching children about plaque and fluoride Using sour candy to make children salivate Serving

asked by stacey on October 16, 2014
3. ### science

A student wants to determine what type of cereal his classmates like best. He buys three of his favorite puffed cereals and one oat cereal. He pours five bowls of each cereal and gives one bowl to each of his 20 classmates. He

asked by Anonymous on September 8, 2013
4. ### MATH

it is found that the number of raisins in a box of a popular cereal is normally distrubuted, with a mean of 133 raisins per box and a standard deviation of 10 raisins. my cereal box has 152 raisins, what is the z-score for this

asked by JONES on December 19, 2016
1. ### algebra tricky q

Clem Colfax had \$10 to buy groceries. He needed milk at 70 cents a carton, bread at 60 cents a loaf, breakfast cereal at 50 cents a box, and meat at \$1.50 a pound. He bought twice as many cartons of milk as loaves of bread, the

asked by Anonymous on May 1, 2016
2. ### English

Which one of these options most accurately represents the information contained in this paragraph? "The stroopwafel was first made in Gouda either during the late 18th century or the early 19th century by a baker using leftovers

asked by Ziying on July 11, 2020
3. ### Mathematics!

A cereal factory has weekly fixed costs of \$48,000. It costs \$1.37 to produce each box of cereal. A box of cereal sells for \$3.99. Express the profit function p(x) that gives the total weekly profit from x boxes of cereal.

asked by Matt on October 20, 2011
4. ### math

A cereal company finds that the number of people who will buy one of its products in the first month that it is introduced is linearly related to the amount of money it spends on advertising. If it spends \$40,000 on advertising

asked by Laura on February 18, 2010
1. ### psychology

Contrary to what one might expect, all intellectual facets of an individual do not necessarily decrease with aging. With regard to memory, wisdom, and creativity, research has found that A. Memory processes become less efficient,

asked by staci on May 29, 2010
2. ### psychology

Contrary to what one might expect, all intellectual facets of an individual do not necessarily decrease with aging. With regard to memory, wisdom, and creativity, research has found that A. Memory processes become less efficient,

asked by staci on May 29, 2010
3. ### STRESS MANAGEMENT TECHNIQUES

Which of the following physiological symptoms are signs of stress? A. Hearing and vision loss B. Arthritis and carpal tunnel syndrome C. Headaches and elevated blood pressure D. Dental cavities and bone loss

asked by john on January 18, 2012
4. ### Algebra 2 check my last answer?!

A supermarket finds that the number of boxes of a new cereal sold increases each week. In the first week, only 16 boxes of the cereal were sold. In the next week, 33 boxes of the cereal were sold and in the third week 50 boxes of

asked by meow on May 3, 2017