First Question: Environmental Science and Technologyreported on a study of insecticides used on dormant orchards in the San Joaquin Valley, CA. Ambient air samples were collected and analyzed daily at an orchard site during the most intense period of spraying. The thion and oxon levels in the air samples were recorded as well as the oxon/thion ratios. Compare the mean oxon/thion ratios of foggy and clear/cloudy conditions at the orchard using a test of hypothesis. Use alpha = 0.05. The data is inOrchard. (Hint: You will have to create a new variable to compare foggy with clear/cloudy.) Should a one-tailed or two-tailed test be conducted? Explain in one sentence. What type of test should be conducted? Independent T-Test Dependent T-Test One-Sample T-Test Two-Tailed Test Is the homogeneous variances assumption met? How do you know, explain in one sentence. What is the p-value for the test? Is the null hypothesis accepted or rejected? Use alpha = 0.05. What can be concluded from the t-test?Second Question: Civil Engineers at West Virginia University developed a 3D model to predict the response of jointed concrete pavement to temperature variations. To validate the model, model predictions were compared to field measurements on key concrete stress variables taken at a newly constructed highway. One variable measured was slab top transverse strain at a distance of 1 meter from the longitudinal joint. The 4-hour changes in slab top transverse strain for 6 days are provided in the data file Slabstrain. Is there a significant difference between the mean daily transverse strain changes from field measurements and the 3D model? Test using alpha equal to 0.05. Should a one-tailed or two-tailed test be conducted? Explain in one sentence. What type of test should be conducted? Independent T-Test Dependent T-Test One-Sample T-Test Two-Tailed Test What is the p-value for the test? Is the null hypothesis accepted or rejected? Use alpha = 0.05. What can be concluded from the t-test?

First Question: Environmental Science and Technology reported on a study of insecticides used on dormant orchards in the San Joaquin Valley, CA. Ambient air samples were collected and analyzed daily...

First Question: Environmental Science and Technology
reported on a study of insecticides used on dormant orchards in the San Joaquin Valley, CA. Ambient air samples were collected and analyzed daily at an orchard site during the most intense period of spraying. The thion and oxon levels in the air samples were recorded as well as the oxon/thion ratios. Compare the mean oxon/thion ratios of foggy and clear/cloudy conditions at the orchard using a test of hypothesis. Use alpha = 0.05. The data is inOrchard. (Hint: You will have to create a new variable to compare foggy with clear/cloudy.)

Should a one-tailed or two-tailed test be conducted? Explain in one sentence.

What type of test should be conducted?
1. Independent T-Test
2. Dependent T-Test
3. One-Sample T-Test
4. Two-Tailed Test

Is the homogeneous variances assumption met? How do you know, explain in one sentence.

What is the p-value for the test?

Is the null hypothesis accepted or rejected? Use alpha = 0.05.

What can be concluded from the t-test?

Should a one-tailed or two-tailed test be conducted? Explain in one sentence.

What type of test should be conducted?
1. Independent T-Test
2. Dependent T-Test
3. One-Sample T-Test
4. Two-Tailed Test

What is the p-value for the test?

Is the null hypothesis accepted or rejected? Use alpha = 0.05.

What can be concluded from the t-test?

Answered Same DayDec 25, 2021

Answer To: First Question: Environmental Science and Technology reported on a study of insecticides used on...

David answered on Dec 25 2021

114 Votes

Question 1
Analysis
1) Since direction of hypothesis is not mentioned this is a two tailed hypothesis.
2) Since samples are independent, I use t test for independent samples.
3) Ho: there is no significant difference in the variance of groups.
H1: there is significant difference in the variance of groups.
From Levene's Test for Equality of Variances, with F= 2.4 and p-value > 0.05, I fail to
reject ho and conclude that there is no significant difference in the variance of groups.
Hence I can say that the homogeneous variances assumption is met.
4) P-value is the probability that null hypothesis is true, here p-value = 0.068
5) With t = -2.047 and p-value >...

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First Question: Environmental Science and Technology reported on a study of insecticides used on dormant orchards in the San Joaquin Valley, CA. Ambient air samples were collected and analyzed daily...

Answer To: First Question: Environmental Science and Technology reported on a study of insecticides used on...

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