# Statistics

posted by .

In order to compare two kinds of feed, thirteen pigs are split into two groups, and each group received one feed. The following are the gains in weight (kilograms) after a fixed period of time:
Feed A: 8.0 7.4 5.8 6.2 8.8 9.5
Feed B: 12.0 18.2 8.0 9.6 8.2 9.9 10.3
We wish to test the hypothesis that Feed B gives rise to larger weight gains. Assume the variances to be unequal. The output from SAS is as follows:

Variable: GAIN Weight gain (kg)
FEED N Mean Std Dev Std Error
----------------------------------------------------
a 6 7.45000000 1.33529023 0.54512995
b 7 10.88571429 3.49400848 1.32061107
Variances T DF Prob>|T|
---------------------------------------
Unequal -2.4048 7.9 0.0431
Equal -2.2596 11.0 0.0451
For H0: Variances are equal, F' = 6.85 DF = (6,5) Prob>F' = 0.0520
The appropriate test statistic and p-value are:

t = -2.4048; p-value = .0431

t =-2.4048; p-value = .0216

t = -2.2596; p-value = .0451

t = -2.2596; p-value = .0256

____

In order to compare two kinds of feed, thirteen pigs are split into two groups, and each group received one feed. The following are the gains in weight (kilograms) after a fixed period of time:

Feed A: 8.0 7.4 5.8 6.2 8.8 9.5

Feed B: 12.0 18.2 8.0 9.6 8.2 9.9 10.3

We wish to test the hypothesis that Feed B gives rise to larger weight gains. The output from JMP is as follows:

Difference
t-Test
DF
Prob > |t|
Estimate
-3.26905
** hidden **
11
0.0566
Std Error
1.53464

Lower 95%
-6.64677

Upper 95%
0.10868

Assuming equal variances

The p-value for the test is:

.0566

.0283

.1132

.1087

2.130

• Statistics -

I just did the test using a TI-83 calculator.

I got a t=-2.60 with a p=.026

If you are doing the test... since .026 is smaller than .05, you can reject the null hypothesis. Which means they did gain more weight with B.

## Similar Questions

1. ### MATH

Tim and Judy mix two kinds of feed for pedigreed dogs. They wish to make 29 pounds of feed worth \$0.47 per pound by mixing one kind worth \$0.44 per pound with another worth \$0.55 per pound. How many pounds of the cheaper kind should …

carol FRIEND ESMERALDA IS AWAY FOR 3 DAYS.SHE ASKED CARLO TO FEED HER PET DOG TWICE A DAY.CARLO FEED HIM ONE 8-OUNCE CAN EVERY TIME HE GOES ESMERALDA'S HOUSE. HOW MANY CANS OF FOOD DOES ESMERALDA NEED TO BUY FOR THE THREE DAY VACATION?
3. ### Alg

If 30 hamburgers feed 25 how many burgers feed 45
4. ### Math-Algebra

DMF Feeds has two different types of cattle feed containing crude protein in the amount of 45% and 20% respectively. How many of each type must a feed lot manager mix together to obtain 10000lbs of a mixture that is 25% protein?
5. ### math

It costs about .10cents per week to feed a snake. How much does it cost to feed 35 snakes for 4 weeks?

A cattle feed company has two grades of feed , A and B . Feed A cost \$2 per 100 pounds and feed B cost \$3 per 100 pounds . Ranchers can order a mixture of feeds A and B . Write a program that calculates the charge for a feed order …
7. ### math

please help me with this one too! : if it costs about \$0.10 per week to feed a snake, how much does it cost to feed 35 snakes for 4 wks?
8. ### statistics

Jesse took two data points from the weight and feed cost data set and calculated a slope, or average rate of change. A rat weighs 3.5 pounds and costs \$4.50 per week to feed, while a Beagle weighs 30 pounds and costs \$9.20 per week …
9. ### statistics

Jesse took two data points from the weight and feed cost data set and calculated a slope, or average rate of change. A rat weighs 3.5 pounds and costs \$4.50 per week to feed, while a Beagle weighs 30 pounds and costs \$9.20 per week …
10. ### Math

Zoe can feed six horses in one hour. Matt takes three times as long to feed that many horses. How long will it take them together to feed 32 horses?

More Similar Questions