Question

In: Statistics and Probability

To study the effect of temperature on yield in a chemical process, five batches were produced...

To study the effect of temperature on yield in a chemical process, five batches were produced at each of three temperature levels. The results follow.

Temperature

50°C 60°C 70°C
30 26 24
20 27 29
32 30 29
35 19 31
28 23 32

a. Construct an analysis of variance table (to 2 decimals but p-value to 4 decimals, if necessary).

Source of Variation Sum of Squares Degrees of Freedom Mean Square F p-value
Treatments
Error
Total

b. Use a .05 level of significance to test whether the temperature level has an effect on the mean yield of the process.

Calculate the value of the test statistic (to 2 decimals).

The -value is - Select your answer -less than .01between .01 and .025between .025 and .05between .05 and .10greater than .10Item 12

What is your conclusion?

Solutions

Expert Solution

Solution:

We can use the excel ANOVA: Single Factor data analysis tool to find the answer to the given questions.
The excel steps are:

Enter the data in excel.

Click on Data > Data Analysis > ANOVA: Single Factor > OK

Input Range: Select the data range for all the data including labels

Mark Labels in the first row

Alpha = 0.05

Choose the output range and click OK.

The output is given below:

Anova: Single Factor
SUMMARY
Groups Count Sum Average Variance
50°C 5 145 29 32
60°C 5 125 25 17.5
70°C 5 145 29 9.5
ANOVA
Source of Variation SS df MS F P-value F crit
Between Groups 53.33333333 2 26.66666667 1.355932203 0.294497217 3.885293835
Within Groups 236 12 19.66666667
Total 289.3333333 14

a. Construct an analysis of variance table (to 2 decimals but p-value to 4 decimals, if necessary).

Answer:

Source of Variation Sum of Squares Degrees of Freedom Mean Square F p-value
Treatments 53.33 2 26.67 1.36 0.2945
Error 236 12 19.67
Total 289.33 14

b. Use a .05 level of significance to test whether the temperature level has an effect on the mean yield of the process.

Calculate the value of the test statistic (to 2 decimals).

Answer: The value of the test statistic is:

The p-value is greater than .10

What is your conclusion?

Since the p-value is greater than the significance level, we, therefore, fail to reject the null hypothesis and conclude that the temperature level has no significant effect on the mean yield of the process.


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