Question

In: Statistics and Probability

1. A poultry company undertook an experiment to determine the effect of certain treatments on chicken...

1. A poultry company undertook an experiment to determine the effect of certain treatments on chicken growth. A sample of 24 young chicks were given one of three possible treatments to aid their growth. In order of cost from least to most costly, the three treatments were as follows: a cheap food; an expensive food; the expensive food plus an injection of a growth serum. After a fixed period of time, the application of the treatments was halted and the chickens were weighed. The response was their increase in weight (in pounds) over the time period of the experiment. Because of space considerations, the experiment had to be carried out in four different laboratories. These laboratories were randomly selected and labeled as “North”, “South”, “East” and “West”. Each laboratory employed a different technician to carry out the experiment. Six chickens were assigned to each laboratory, and the three treatments were randomly assigned to the chickens within each laboratory (two chickens having each treatment within each laboratory). In your mini-report, explain why it makes sense to design and analyze this as a block design. Using the sample data, formally test whether it turned out to be sensible to use blocks, providing numerical justification (test statistic and P-value) for your conclusion. Also formally assess the main research question of interest: whether the three treatments yield significantly
different mean growth, again providing numerical justification (test statistic and P-value) for your conclusion. If you find a difference across the treatments, investigate exactly which treatments differ significantly from each other. Provide recommendations to the poultry company about their best practices based on your findings.

SAS code:

/* Problem 1 */


DATA one;
INPUT lab $ treatment :$12. growth;
cards;
East Cheap 4.62
East Cheap 4.93
East Expens 6.25
East Expens 5.97
East Expens_Serum 6.41
East Expens_Serum 6.54
West Cheap 5.36
West Cheap 5.49
West Expens 6.53
West Expens 6.62
West Expens_Serum 6.81
West Expens_Serum 6.63
North Cheap 4.65
North Cheap 5.32
North Expens 5.96
North Expens 6.12
North Expens_Serum 6.33
North Expens_Serum 6.44
South Cheap 5.76
South Cheap 6.32
South Expens 6.47
South Expens 6.68
South Expens_Serum 6.71
South Expens_Serum 6.78
;
run;

Solutions

Expert Solution

Output:

Where alpha(level of significance) = 0.05.

From Anova table:

The lab F-statistics = 14.31 and P-value = 0.0003, it is means in lab have significant difference.

The treatment F-statistics = 79.54 and P-value = <0.0001, it is mean in treatment have significant difference.

But In Interaction lab*treatment F = 2.22 and P-value = 0.1131, it is mean there is no significant difference.

Multiple Comparison for Lab:

Which means covered by bar it means there is no significant difference.

Now see who are significant:

There is a significant difference between South and North, South and East.

There is a siginificant difference between West and North, West and East.

Multiple Comparison for Treatment:

Which means covered by bar it means there is no significant difference.

Now see who are significant:

There is a significant difference between Expens_Serum and Cheap.

There is a siginificant difference between Expens and Cheap.


Related Solutions

An agronomist wanted to investigate the factors that determine crop yield. Accordingly, she undertook an experiment...
An agronomist wanted to investigate the factors that determine crop yield. Accordingly, she undertook an experiment wherein a farm was divided into 30 one-acre plots. The amount of fertilizer applied to each plot was varied. Corn was then planted, and the amount of corn harvested at the end of the season was recorded. The collected data is given below: Yield Fertilizer Yield Fertilizer 223 100 220 100 321 200 385 200 158 300 247 300 187 400 390 400 331...
. An experiment was performed on a certain metal to determine if the strength is a...
. An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 20 metal sheets are given below. Use the simple linear regression model. ∑X = 40 ∑X2 = 200 ∑Y =   80 ∑Y2 = 1120 ∑XY = 460 Find the estimated y intercept and slope and write the equation of the least squares regression line. Estimate Y when X is equal to 3 hours. Also determine the...
. An experiment was performed on a certain metal to determine if the strength is a...
. An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 25 metal sheets are given below. Use the simple linear regression model. ∑X = 50 ∑X2 = 200 ∑Y = 75 ∑Y2 = 1600 ∑XY = 400 Find the estimated y intercept and slope. Write the equation of the least squares regression line and explain the coefficients. Estimate Y when X is equal to 4 hours....
a. An experiment was performed on a certain metal to determine if the strength is a...
a. An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 25 metal sheets are given below. Use the simple linear regression model. ∑X = 50 ∑X2 = 200 ∑Y = 75 ∑Y2 = 1600 ∑XY = 400 Find the estimated y intercept and slope. Write the equation of the least squares regression line and explain the coefficients. Estimate Y when X is equal to 4 hours....
An experiment was performed on a certain metal to determine if the strength is a function...
An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 25 metal sheets are given below. Use the simple linear regression model. ∑X = 50 ∑X2 = 200 ∑Y = 75 ∑Y2 = 1600 ∑XY = 400 Find the estimated y intercept and slope. Write the equation of the least squares regression line and explain the coefficients. Estimate Y when X is equal to 4 hours. Also...
9. An experiment was performed on a certain metal to determine if the strength is a...
9. An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 20 metal sheets are given below. Use the simple linear regression model. ∑X = 40 ∑X2 = 200 ∑Y = 80 ∑Y2 = 1120 ∑XY = 388 Find the estimated y intercept and slope. Write the equation of the least squares regression line and explain the coefficients. Estimate Y when X is equal to 5 hours....
An experiment was performed on a certain metal to determine if the strength is a function...
An experiment was performed on a certain metal to determine if the strength is a function of heating time (hours). Results based on 25 metal sheets are given below. Use the simple linear regression model. ∑X = 50 ∑X2 = 200 ∑Y = 75 ∑Y2 = 1600 ∑XY = 400 Find the estimated y intercept and slope. Write the equation of the least squares regression line and explain the coefficients. Estimate Y when X is equal to 4 hours. Also...
In an experiment to determine the effect of ambient temperature on the emissions of oxides of...
In an experiment to determine the effect of ambient temperature on the emissions of oxides of nitrogen of diesel trucks, ten trucks were run at temperatures of 40°F and 80°F. The emissions, in parts per billion, are presented in the following table. Truck 1 2 3 4 5 6 7 8 9 10 40° 834.7 753.2 855.7 901.2 785.4 862.9 882.7 740.3 748.0 848.6 80° 815.2 765.2 842.6 797.1 764.3 819.5 783.6 694.5 772.9 794.7 Test the claim that there...
In an experiment to determine the effect of nutrition on the attention spans of elementary school...
In an experiment to determine the effect of nutrition on the attention spans of elementary school students, a group of 45 students is divided into three groups of 15, and randomly assigned to each of three meal plans: no breakfast, light breakfast, and full breakfast. Their attention spans, in minutes, were recorded. Say you want to test the hypothesis that the means of the attention spans are not all the same at a level of significance of 5%. (a) (3...
An experiment was performed to determine the effect of four different chemicals on the strength of...
An experiment was performed to determine the effect of four different chemicals on the strength of a fabric. These chemicals are used as part of the permanent press finishing process. Five fabric samples were selected, and a randomized complete block design was run by testing each chemical type once in random order on each fabric sample. The data are shown in Table below. test for differences in means using an ANOVA with α=0.01 Fabric Sample Chemical Type 1 2 3...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT